ANN: Leo 4.4.7 final released
Leo 4.4.7 final is available at: http://sourceforge.net/project/showfiles.php?group_id=3458package_id=29106 This version features a new ipython plugin that provides a two-way bridge between Leo and IPython. See http://webpages.charter.net/edreamleo/IPythonBridge.html Leo is a text editor, data organizer, project manager and much more. See: http://webpages.charter.net/edreamleo/intro.html The highlights of Leo 4.4.7: - The ipython plugin creates a simple, powerful, effective bridge between IPython and Leo. See http://webpages.charter.net/edreamleo/IPythonBridge.html - Improved handling of unicode encodings in @auto files. - All import commands now support @path directives in ancestor nodes. - Fixed several minor bugs. Links: -- Leo: http://webpages.charter.net/edreamleo/front.html Forum:http://groups.google.com/group/leo-editor Download: http://sourceforge.net/project/showfiles.php?group_id=3458 CVS: http://leo.tigris.org/source/browse/leo/ Quotes: http://webpages.charter.net/edreamleo/testimonials.html Edward K. Ream email: [EMAIL PROTECTED] Leo: http://webpages.charter.net/edreamleo/front.html -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
[ANN] Shed Skin (restricted) Python-to-C++ compiler 0.0.27
Hi all, I have just released Shed Skin 0.0.27. Thanks in large part to the GHOP students, this new release comes with some interesting new goodies: - support for 're', via libpcre (perl-compatible-regular-expressions) - support for 'time' (except for time.strptime under Windows) - basic support for 'staticmethod' and 'property' - support for 'fnmatch', 'glob' (bootstrapped) - improved support for 'os' (POSIX) - OSX support again (including extension modules!) - many fixes for multi-dir/multi-file projects - several builtin optimizations (zip, list(str)..) - type model for 'datetime' (no C++ implementation yet) - split up compiler core, ss.py, into several files - many minor bugfixes As for the 4 new modules (re, time, fnmatch, glob), this means Shed Skin now supports most of the following modules: bisect collections copy fnmatch getopt glob math os os.path random re string sys time I could still really use some help with implementing/bootstrapping implementations for 'datetime' and 'socket', and further improving 'os' (especially under Windows). Note that since the previous release we have a nice tutorial online. It explains in detail how to install and use Shed Skin, how to use it to build (simple) extension modules and how to combine Shed Skin with numpy and parallel processing solutions such as Parallel Python. Thanks, Mark Dufour. -- One of my most productive days was throwing away 1000 lines of code - Ken Thompson -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
vtd-xml 2.3 released
VTD-XML 2.3 is now released. To download the latest version please visit http://sourceforge.net/project/showfiles.php?group_id=110612package_id=120172. Below is a list of new features and enhancements in this version. a.. VTDException is now introduced as the root class for all other VTD-XML's exception classes (per suggestion of Max Rahder). b.. Transcoding capability is now added for inter-document cut and paste. You can cut a chuck of bytes in a UTF-8 encoded document and paste it into a UTF-16 encoded document and the output document is still well-formed. c.. ISO-8859-10, ISO-8859-11, ISO-8859-12, ISO-8859-13, ISO-8859-14 and ISO-8859-15 support has now been added d.. Zero length Text node is now possible. e.. Ability to dump in-memory copy of text is added. f.. Various code cleanup, enhancement and bug fixes. Below are some new articles related to VTD-XML a.. Index XML documents with VTD-XML http://xml.sys-con.com/read/453082.htm b.. Manipulate XML content the Ximple Way http://www.devx.com/xml/Article/36379 c.. VTD-XML: A new vision of XML http://www.developer.com/xml/article.php/3714051 d.. VTD-XML: XML Processing for the future http://www.codeproject.com/KB/cs/vtd-xml_examples.aspx If you (or someone you know) like the concept of VTD-XML, think that it can help solve enterprises' XML processing related issues (particularly those related to SOA), and would like to directly influence and contribute to the development of the future of Internet, please email me [EMAIL PROTECTED]). We are looking for open source software developers and project management people to take VTD-XML to the next level. -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: [ANN] Shed Skin (restricted) Python-to-C++ compiler 0.0.27
Of course I forgot to add the URL: http://shedskin.googlecode.com Mark Dufour. -- One of my most productive days was throwing away 1000 lines of code - Ken Thompson -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: Return value of an assignment statement?
On Sat, 23 Feb 2008 22:44:30 +, Tim Roberts wrote: Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote: On Fri, 22 Feb 2008 11:00:17 -0800, Aahz wrote: It's just too convenient to be able to write L += ['foo'] without rebinding L. nitpickBut ``+=`` does rebind./nitpick Usually, but there's an exception for lists, which a specific implementation for += that calls append. Or do I misunderstand you? Terry Reedy showed the tuple proof, here's the read only property case:: class A(object): def __init__(self): self._data = list() @property def data(self): return self._data a = A() a.data += [42] Output:: Traceback (most recent call last): File test.py, line 25, in module a.data += [42] AttributeError: can't set attribute Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Article of interest: Python pros/cons for the enterprise
On Sat, 23 Feb 2008 19:45:45 -0800, Jeff Schwab wrote: Paul Rubin wrote: Jeff Schwab [EMAIL PROTECTED] writes: One great thing about C is that a programmer can realistically hope to know the entire language definition; maybe Guido would like the same to be true of Python. C is horrendously complicated, with zillions of obscure traps. C++ is even worse; Who feeds you this stuff? there's actually a published book specifically about C++ pitfalls. Mercy, a whole book? Well, that might not be zillions, but it is sure a lot of pitfalls. My current favorite book of language-specific pitfalls: http://www.javapuzzlers.com/ I'm not sure what you are trying to communicate here. Wait a few years. A Python Puzzlers book will surely be on the shelves eventually. You wish. If so, then it will either be an incredibly short book, or the language Python in 2012 will be nothing like Python now. Here are some of the top results when Googling python pitfalls: http://zephyrfalcon.org/labs/python_pitfalls.html http://evanjones.ca/python-pitfall-scope.html Yeah, let's have a look at those. From the first link: 1. Inconsistent indentation 2. Assignment, aka names and objects 3. The += operator 4. Class attributes vs instance attributes 5. Mutable default arguments 6. UnboundLocalError 7. Floating point rounding errors 8. String concatenation 9. Binary mode for files 10. Catching multiple exceptions Ten pitfalls. You might be able to pad that out to a twenty page leaflet, including an index. Number ten is already gone from Python 3; numbers 7 and 9 aren't Python specific at all; most of the others are only a pitfall if you come to Python thinking that Python is C or Java, or whatever other language you're used to. The second link is just bizarre. It claims that Python does not have nested, block variable scopes like I am accustomed to in nearly every other programming language I use, like C, C#, C++, Objective C, Perl, and Java. (Notice the common denominator?) But that's nonsense -- Python does have nested block variable scopes. This pitfall, if it is one, is that Python doesn't create a new scope for if-blocks. Coming from a Pascal background instead of C, it never even occurred to me that if- blocks could be a new scope, or that anyone would possibly want it to be. Again, the real pitfall is not Python, but imagining that Python is C. Maybe C++ needs better pub. The guy who wrote the first of those articles says elswhere on his web site: My Python pitfalls article seems to be a popular read. It's written from a somewhat negative viewpoint: things that can go wrong. (Of course, that's useful; you're never going to do these things wrong again. Right? ;-) To counter-balance this, I think there should an article with a more positive viewpoint as well. So I was wondering, if I could collect 10 anti-pitfalls; parts of the Python language that are especially clever, elegant and intuitive. Good luck with that. [quote] I've seen Python criticized as ugly precisely because it doesn't have a trick-based view of the world. In many ways, it's a dull language, borrowing solid old concepts from many other languages styles: boring syntax, unsurprising semantics, few automatic coercions, etc etc. But that's one of the things I like about it. -- Tim Peters But even given that, here's a good start, the first four things that came to mind: 1. Program structure follows indentation. No more wars over where to put the braces. The presentation *is* the structure. 2. Namespaces. 3. Generators and iterators. Especially generators. 4. Exceptions. try blocks are fast, don't be scared to use them. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Official IRC channel for Python?
Hallöchen! Steve Holden writes: js wrote: Really? maybe I'm been blocked from it... thanks. Currently 479 users. I'd be nice if we could achieve some sort of network effect in [EMAIL PROTECTED] I don't want to start a Jabber v. IRC debate here; I simply prefer it and maybe others do so, too. Tschö, Torsten. -- Torsten Bronger, aquisgrana, europa vetus Jabber ID: [EMAIL PROTECTED] (See http://ime.webhop.org for further contact info.) -- http://mail.python.org/mailman/listinfo/python-list
simpleparse - what is wrong with my grammar?
The program below gives me segmentation fault (core dumped). Environment: Linux gandalf-desktop 2.6.20-16-generic #2 SMP Tue Feb 12 05:41:34 UTC 2008 i686 GNU/Linux Python 2.5.1 What is wrong with my grammar? Can it be an internal error in simpleparse? Thanks, Laszlo from simpleparse.common import numbers, strings, comments from simpleparse.parser import Parser declaration = r''' expr:= paren_expr/unop_expr/binop_expr/word paren_expr := (,expr,) unop_expr := unop,expr binop_expr := expr,binop,expr unop:= (+/-) binop := (|//@) word:= [a-zA-Z], [a-zA-Z0-9_]* ''' parser = Parser( declaration) success, resultTrees, nextCharacter = parser.parse(testword,production=expr,processor=None) print success -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter: Missing the last piece of the puzzle
Simon Forman wrote: yes! check out http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/464635 HTH, ~Simon Thanks, Simon. Looks like that will do it. Actually, it looks like that will overdo it. I'll be setting File/Save to enabled after every keystroke. Ideally, I'd like to set my statuses when the user clicks the File option or types Alt-F. This makes me wonder if there's a mixin that could find this event. Hmmm. Alternatively, could modify this code to NOT reset the modified flag, so I only get called on the first modification. Hmmm. -- http://mail.python.org/mailman/listinfo/python-list
Re: Article of interest: Python pros/cons for the enterprise
On Feb 24, 8:08 am, Steven D'Aprano [EMAIL PROTECTED] cybersource.com.au wrote: On Sat, 23 Feb 2008 19:45:45 -0800, Jeff Schwab wrote: The second link is just bizarre. It claims that Python does not have nested, block variable scopes like I am accustomed to in nearly every other programming language I use, like C, C#, C++, Objective C, Perl, and Java. (Notice the common denominator?) But that's nonsense -- Python does have nested block variable scopes. This pitfall, if it is one, is that Python doesn't create a new scope for if-blocks. Coming from a Pascal background instead of C, it never even occurred to me that if- blocks could be a new scope, or that anyone would possibly want it to be. I haven't read the link, but it is true that python 3 is deficient in that area: names in an enclosing scope can be accessed but not rebound. In the latter case the interpreter assumes them to be local names. Python 3000 fixes this with the new 'nonlocal' compilation directive. E.g. (python 2.5) def counter(acc=0, step=1): ... def tick(): ... acc += step ... return acc ... return tick ... c = counter() c() Traceback (most recent call last): File stdin, line 1, in module File stdin, line 3, in tick UnboundLocalError: local variable 'acc' referenced before assignment (python 3.0) def counter(acc=0, step=1): ... def tick(): ... nonlocal acc ... acc += step ... return acc ... return tick ... c = counter() c() 1 c() 2 -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: looking for open source simulink clone in python
[EMAIL PROTECTED] wrote: Does anyone know of something like this? I've searched to no avail. GNUradio companion is promising but tied to gnuradio. not exactly, this is what I've found until now * Orange http://magix.fri.uni-lj.si/orange/screenshots.asp * Elefant https://elefant.developer.nicta.com.au/ * Enthought with Traits UI, they are developping it for a customer, and planned to show us something in december 2007, but I guess it's somewhat delayed. * Vision http://www.scripps.edu/%7Esanner/python/viper/index.html * Pyphant http://www.fmf.uni-freiburg.de/service/Servicegruppen/sg_wissinfo/Software/Pyphant So I decided to start another one, some results can be seen here: http://oase.uci.kun.nl/~mientki/data_www/pylab_works/pw_animations_screenshots.html cheers, Stef -- http://mail.python.org/mailman/listinfo/python-list
Re: PHP Developer highly interested in Python (web development) with some open questions...
re encryption I ran a small software company in the '80s. We did the unthinkable: shipped our software with a money-back guarantee. Anyone could buy the software, copy it and then request a full refund. Return rate: 0.5%. Of the returns we guessed that about half of them were for perfectly legit reasons. Treat your customers as if they're all honest and ethical. Most of them will be. The rest will defeat your encryption efforts or just skip your product. -- http://mail.python.org/mailman/listinfo/python-list
Re: n00b with urllib2: How to make it handle cookie automatically?
On Feb 23, 5:57 am, 7stud [EMAIL PROTECTED] wrote: On Feb 21, 11:50 pm, est [EMAIL PROTECTED] wrote: Hi all, I need urllib2 do perform series of HTTP requests with cookie from PREVIOUS request(like our browsers usually do ). Cookies from a previous request made in the currently running program? Or cookies from requests that were made when you previously ran the program? from cookielib import CookieJar class SmartRequest(): cj=CookieJar() def __init__(self, strUrl, strContent=None): self.Request= urllib2.Request(strUrl, strContent) self.cj.add_cookie_header(self.Request) self.Response = urllib2.urlopen(Request) self.cj.extract_cookies(self.Response, self.Request) def url def read(self, intCount): return self.Response.read(intCount) def headers(self, strHeaderName): return self.Response.headers[strHeaderName] The code does not work because each time SmartRequest is initiated, object 'cj' is cleared. How to avoid that? The only stupid solution I figured out is use a global CookieJar object. Is there anyway that could handle all this INSIDE the class? Examine this code and its output: class SmartRequest(object): def __init__(self, id): if not getattr(SmartRequest, 'cj', None): SmartRequest.cj = I'm a cookie jar. Created by request: the getattr method is exactly what I am looking for, thanks! On Feb 23, 2:05 pm, 7stud [EMAIL PROTECTED] wrote: On Feb 21, 11:50 pm, est [EMAIL PROTECTED] wrote: class SmartRequest(): You should always define a class like this: class SmartRequest(object): unless you know of a specific reason not to. Thanks for the advice! -- http://mail.python.org/mailman/listinfo/python-list
iter(lambda:f.read(8192),'')
what is the difference between iter(lambda:f.read(8192), ') and iter(f.read(8192),'') ? -- http://mail.python.org/mailman/listinfo/python-list
Ruby with Netbeans question!
Hi all Hope I`m ok posting a Netbeans query here?. I`m trying to learn Ruby using the Netbeans IDE. It seems a pretty slick application but I`m wondering if its possible to run a prog without creating a `new project` each time?. I just want to be able to type in a few lines of code and run it but it keeps running the `main project` which might be an earlier prog I have written??. I`m sure the solution is staring me in the face but would be grateful for any tips folk could provide. Cheers Steve -- http://mail.python.org/mailman/listinfo/python-list
Re: advanced usage of python threads
Chris, I have already made my choice, I am asking just for a little help with some documentation. I know about twisted.enterprise.adbapi, but the company is working with sqlalchemy at the time. So please, I know you have good intentions but you're kind of not helping me :) Well, probably instead of asking you people I should just start searching the net, thing that I am already doing. But if any of you has some info, please share. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
Re: Ruby with Netbeans question!
Hi Steve, Considering this is a Python list, I doubt you'll get much help for something related to Netbeans and Ruby. You're better off asking questions on the proper list : http://www.netbeans.org/community/lists/ Quentin On Sun, Feb 24, 2008 at 12:26 PM, Steve [EMAIL PROTECTED] wrote: Hi all Hope I`m ok posting a Netbeans query here?. I`m trying to learn Ruby using the Netbeans IDE. It seems a pretty slick application but I`m wondering if its possible to run a prog without creating a `new project` each time?. I just want to be able to type in a few lines of code and run it but it keeps running the `main project` which might be an earlier prog I have written??. I`m sure the solution is staring me in the face but would be grateful for any tips folk could provide. Cheers Steve -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Ruby with Netbeans question!
On Feb 24, 11:26 am, Steve [EMAIL PROTECTED] wrote: Hi all Hope I`m ok posting a Netbeans query here?. I`m trying to learn Ruby using the Netbeans IDE. It seems a pretty slick application but I`m wondering if its possible to run a prog without creating a `new project` each time?. I just want to be able to type in a few lines of code and run it but it keeps running the `main project` which might be an earlier prog I have written??. I`m sure the solution is staring me in the face but would be grateful for any tips folk could provide. Cheers Steve Sorry folks wrong group!!. -- http://mail.python.org/mailman/listinfo/python-list
Re: n00b with urllib2: How to make it handle cookie automatically?
On Feb 23, 2:42 am, Rob Wolfe [EMAIL PROTECTED] wrote: est [EMAIL PROTECTED] writes: Hi all, I need urllib2 do perform series of HTTP requests with cookie from PREVIOUS request(like our browsers usually do ). Many people suggest I use some library(e.g. pycURL) instead but I guess it's good practise for a python beginner to DIY something rather than use existing tools. So my problem is how to expand the urllib2 class from cookielib import CookieJar class SmartRequest(): cj=CookieJar() def __init__(self, strUrl, strContent=None): self.Request = urllib2.Request(strUrl, strContent) self.cj.add_cookie_header(self.Request) self.Response = urllib2.urlopen(Request) self.cj.extract_cookies(self.Response, self.Request) def url def read(self, intCount): return self.Response.read(intCount) def headers(self, strHeaderName): return self.Response.headers[strHeaderName] The code does not work because each time SmartRequest is initiated, object 'cj' is cleared. How to avoid that? The only stupid solution I figured out is use a global CookieJar object. Is there anyway that could handle all this INSIDE the class? I am totally new to OOP python programming, so could anyone give me some suggestions? Thanks in advance Google for urllib2.HTTPCookieProcessor. HTH, Rob- Hide quoted text - - Show quoted text - Wow, thank you Rob Wolfe! Your reply is shortest yet most helpful! I solved this problem by the following code. class HTTPRefererProcessor(urllib2.BaseHandler): Add Referer header to requests. This only makes sense if you use each RefererProcessor for a single chain of requests only (so, for example, if you use a single HTTPRefererProcessor to fetch a series of URLs extracted from a single page, this will break). There's a proper implementation of this in module mechanize. def __init__(self): self.referer = None def http_request(self, request): if ((self.referer is not None) and not request.has_header(Referer)): request.add_unredirected_header(Referer, self.referer) return request def http_response(self, request, response): self.referer = response.geturl() return response https_request = http_request https_response = http_response def main(): cj = CookieJar() opener = urllib2.build_opener( urllib2.HTTPCookieProcessor(cj), HTTPRefererProcessor(), ) urllib2.install_opener(opener) urllib2.urlopen(url1) urllib2.urlopen(url2) if __main__ == __name__: main() And it's working great! Once again, thanks everyone! -- http://mail.python.org/mailman/listinfo/python-list
Re: Article of interest: Python pros/cons for the enterprise
Jeff Schwab [EMAIL PROTECTED] wrote: Matthew Woodcraft wrote: I see. Then, unless you don't care about data loss passing silently, this 'most traditional' way to open a file is unsuitable for files opened for writing. No, why would you think so? If you want something special to happen when the close() fails (as you indeed would if you were writing important data), you have to say somehow that you want your special code called. What syntax would you like to see? Here's what the C++ would look like, supposing you have a type LoggingCloser that calls close and logs any failure: Sure, but this LoggingCloser isn't what you described as the 'most traditional, easiest way to open a file in C++'. The more general point is that, where you want to take action on cleanup and you need to handle errors from this action, it usually isn't enough to have one class per type of resource which knows what clean up action is required (because the required response to the error usually varies). Additionally, in languages where exceptions are the usual way to report errors but exceptions from destructors are not managed pleasantly, the error recovery code can't use the language's normal mechanisms for dealing with the error response. -M- -- http://mail.python.org/mailman/listinfo/python-list
Re: iter(lambda:f.read(8192),'')
On Feb 24, 5:11 am, gert [EMAIL PROTECTED] wrote: what is the difference between iter(lambda:f.read(8192), ') and iter(f.read(8192),'') ? One does not work, and one is syntactically incorrect: iter(f.read(8192),'') Traceback (most recent call last): File pyshell#0, line 1, in module iter(f.read(8192),'') TypeError: iter(v, w): v must be callable iter(lambda:f.read(8192), ') SyntaxError: EOL while scanning single-quoted string To clarify: f.read(8192) returns the next 8192 bytes of the file in a string, or whatever is leftover, or an empty string when the file is exhausted. lambda: f.read(8192) is a function that will return the next 8192 bytes of the file every time it is called. So iter(f.read(8192),'') is evaluated as iter(some_string, ''). When iter receives two arguments, it expects the first to be a function, not a string. iter(lambda:f.read(8192), '') (what you probably meant) is what it looks like: iter(some_func, ''). -- http://mail.python.org/mailman/listinfo/python-list
Re: graphing/plotting with python and interface builder
Jacob Davis schrieb:
I found SM2DGraphView, but I guess that I am too much of a newbie with
interface builder and pyobjc to figure out how to get SM2DGraphView to
work. Are there any good tutorials (or better yet, examples) of how to
get SM2DGraphView to work?
I don't know pyobjc well at all.
There isn't much to it. Unfortunately, there aren't many good tutorials,
but at least a few examples in the pyobjc repository.
below is my code for implementing the SM2DGraphDataSource category. It
is of course interspersed with my application-logic, but should give you
a start.
Additionally, you need to load the SM2DGraphView-framework. The code to
do so is also below.
Diez
#
# BCGraphViewController.py
# BruceControl
#
# Created by Diez Roggisch on 22.02.08.
# Copyright (c) 2008 __MyCompanyName__. All rights reserved.
#
from Foundation import *
from AppKit import *
import sys
from PyObjCTools import NibClassBuilder
import objc
MODES = displaySpeed, displayPosition
kSM2DGraph_Axis_Y = 0
kSM2DGraph_Axis_X = 1
kSM2DGraph_Axis_Y_Right = 2
kSM2DGraph_Axis_Y_Left = kSM2DGraph_Axis_Y
class BCGraphViewController(NibClassBuilder.AutoBaseClass):
_displayPosition = False
_displaySpeed = False
def displayPosition(self):
return self._displayPosition
def setDisplayPosition_(self, v):
self._displayPosition= v
self.reloadData()
def displaySpeed(self):
return self._displaySpeed
def setDisplaySpeed_(self, v):
self._displaySpeed= v
self.reloadData()
def awakeFromNib(self):
self._displayed_mis = []
self._ts_min = 0.0
self._ts_max = 0.0
self.graphView.setDataSource_(self)
def setMotorInfos_(self, motor_infos):
self._motor_infos = motor_infos
# apparently, it's enough to just
# subscribe once
motor_infos[0].subscribeDisplayChanged(self)
def setConnector_(self, connector):
self._connector = connector
connector.subscribeStateListener(self)
def stateArrived_(self, n):
state = n.object()
ts = float(state.timestamp) / 10.0 # nano to seconds
if self._ts_min == 0:
self._ts_min = ts
self._ts_max = ts
def reloadData(self):
if self.numberOfLinesInTwoDGraphView_(None):
self.graphView.reloadData()
self.graphView.reloadAttributes()
def displayChanged_(self, n):
motor_info = n.object()
motor_id = motor_info.motor_id
if motor_info.display() and motor_info not in self._displayed_mis:
self._displayed_mis.append(motor_info)
else:
try:
self._displayed_mis.remove(motor_info)
except ValueError:
pass
self.reloadData()
@property
def active_modes(self):
return [mode for mode in MODES if getattr(self, mode)()]
@property
def activated_views(self):
return len(self.active_modes)
@objc.signature('I@:@')
def numberOfLinesInTwoDGraphView_(self, view):
res = len(self._displayed_mis) * self.activated_views
return res
@objc.signature('@@:@I')
def twoDGraphView_dataForLineIndex_(self, view, lineIndex):
av = self.activated_views
# first, compute the mi to be used
offset = lineIndex // av
mi = self._motor_infos[offset]
mode = self.active_modes[lineIndex % av]
return mi[mode]
@objc.signature('d@:@Ii')
def twoDGraphView_maximumValueForLineIndex_forAxis_(self, view,
lineIndex, axis):
if not self.numberOfLinesInTwoDGraphView_(view):
return .0
av = self.activated_views
mode = self.active_modes[lineIndex % av]
if axis == kSM2DGraph_Axis_Y:
maxs = [mi.max[mode] for mi in self._displayed_mis]
return max(maxs)
elif axis == kSM2DGraph_Axis_X:
return float(self._ts_max)
return .0
@objc.signature('d@:@Ii')
def twoDGraphView_minimumValueForLineIndex_forAxis_(self, view,
lineIndex, axis):
if not self.numberOfLinesInTwoDGraphView_(view):
return .0
av = self.activated_views
mode = self.active_modes[lineIndex % av]
if axis == kSM2DGraph_Axis_Y:
mins = [mi.min[mode] for mi in self._displayed_mis]
return min(mins)
elif axis == kSM2DGraph_Axis_X:
return float(self._ts_min)
return .0
@objc.signature('@@:@I')
def twoDGraphView_attributesForLineIndex_(self, view, lineIndex):
try:
if not self.numberOfLinesInTwoDGraphView_(None):
return None
av = self.activated_views
# first, compute the mi to be used
offset = lineIndex // av
mi = self._motor_infos[offset]
res =
Re: PHP Developer highly interested in Python (web development) with some open questions...
Tamer Higazi wrote: - What is the Zope Applikation Server? Is it also a Webserver like the Apache or Tomcat Webserver? Zope is much more than a webserver. It's a web application server including a fast object database (ACID, support clustering and MVCC), a powerful plugin architecture, builtin security and many, many more. Read http://en.wikipedia.org/wiki/Zope - Is there a way of Round Tripp engineering based on UML XMI Files to generate python files (with it's dependencies) Plone and Archetypes (based on Zope) have a tool named ArchGenXML. It takes UML XMI files and generates content types, workflows and products for the Plone CMS. - Let us assume, I want to write a Web application in Python (what I did now in PHP5) and want to distribute my work under commercial usage. Can I encrypt my work and generate Licence Files for Customers who would purchase my End-Sollution like with: Source code encryption can't stop people from reading or stealing your code. Microsoft tries it, Apple tries it and even the RIAA tries it. None of them had success in the past. :] A proper service contract is more important. Christian -- http://mail.python.org/mailman/listinfo/python-list
Pydev/Eclipse: How to add filters for the navigator ?
Running the latest version of pydev (1.3.13). I failed to figure out how to add a filter that excludes stuff like *.pyc from the file navigator. The Filters... dialogue allows to Select All and Deselect All, but from an empty list :-( What's the trick ? Thanks ... -- http://mail.python.org/mailman/listinfo/python-list
Re: ILeo (IPython-Leo bridge); a marriage made in heaven?
Are you part of Leo? This smells like a marketing scheme to me. Actually this is an example of a beautiful collaboration between Edward (the progenitor of leo) and Ville (the ipython side). Fantastic and elegant stuff, which you have to try to appreciate. AK -- http://mail.python.org/mailman/listinfo/python-list
Re: PHP Developer highly interested in Python (web development) with some open questions...
Am Sonntag, den 24.02.2008, 13:44 +0100 schrieb Christian Heimes: Plone and Archetypes (based on Zope) have a tool named ArchGenXML. It takes UML XMI files and generates content types, workflows and products for the Plone CMS. I don't want workflows, I want the classes and methods generated. Or do I understand this answer wrong Source code encryption can't stop people from reading or stealing your code. Microsoft tries it, Apple tries it and even the RIAA tries it. None of them had success in the past. :] A proper service contract is more important. Not true! you can disassemble the app and then have fun reading, not that easy. I simply want that nobody reads the sourcecode or better said the content of the python files I would have generated. But I think I have found one sollution. I have red that the bytecode compiler from Python is very advanced (more then the PHP bcompiler) to give me good brotection. Still I will have to look a lot for Python libraries which give me the same hardcore feeling like ezComponent (ez.no). I think Python is great! And I will soon dive there in! :) What is the difference between Ruby and Python? Can anyone say that to me? -- http://mail.python.org/mailman/listinfo/python-list
Re: advanced usage of python threads
hyperboreean wrote: Chris, I have already made my choice, I am asking just for a little help with some documentation. I know about twisted.enterprise.adbapi, but the company is working with sqlalchemy at the time. So please, I know you have good intentions but you're kind of not helping me :) Well, probably instead of asking you people I should just start searching the net, thing that I am already doing. But if any of you has some info, please share. Thanks. Well, if you plan to use threading with Twisted you would probably be a lot better off asking questions on the Twisted mailing list. [EMAIL PROTECTED] regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Official IRC channel for Python?
Torsten Bronger wrote: Hallöchen! Steve Holden writes: js wrote: Really? maybe I'm been blocked from it... thanks. Currently 479 users. I'd be nice if we could achieve some sort of network effect in [EMAIL PROTECTED] I don't want to start a Jabber v. IRC debate here; I simply prefer it and maybe others do so, too. The best way to achieve this may be to challenge the Twisted guys who habitually hang out on Python to do it in under ten lines :-) regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: iter(lambda:f.read(8192),'')
aha ok got it :) -- http://mail.python.org/mailman/listinfo/python-list
To PEAK or not to PEAK
I am about to start a large-scale enterprise project next month (I insist on using Python instead Java and .NET and I am sure `they` will thank me eventually). I was wondering around making my components-and-libraries-shopping- list and came across PEAK. My paranoia is that PEAK would make me write my application in PEAK instead of Python (I felt that in the past with Django). Therefore, I would like to hear the voices of you which have any experience with PEAK. Whether you are using it or used it in the past or tried to use it and abandoned it. How happy were you while using it? How simple it is to use? -- http://mail.python.org/mailman/listinfo/python-list
[ANN] Shed Skin (restricted) Python-to-C++ compiler 0.0.27
Hi all, I have just released Shed Skin 0.0.27. Thanks in large part to the GHOP students, this new release comes with some interesting new goodies: - support for 're', via libpcre (perl-compatible-regular-expressions) - support for 'time' (except for time.strptime under Windows) - basic support for 'staticmethod' and 'property' - support for 'fnmatch', 'glob' (bootstrapped) - improved support for 'os' (POSIX) - OSX support again (including extension modules!) - many fixes for multi-dir/multi-file projects - several builtin optimizations (zip, list(str)..) - type model for 'datetime' (no C++ implementation yet) - split up compiler core, ss.py, into several files - many minor bugfixes As for the 4 new modules (re, time, fnmatch, glob), this means Shed Skin now supports most of the following modules: bisect collections copy fnmatch getopt glob math os os.path random re string sys time I could still really use some help with implementing/bootstrapping implementations for 'datetime' and 'socket', and further improving 'os' (especially under Windows). Note that since the previous release we have a nice tutorial online. It explains in detail how to install and use Shed Skin, how to use it to build (simple) extension modules and how to combine Shed Skin with numpy and parallel processing solutions such as Parallel Python. Thanks, Mark Dufour. -- One of my most productive days was throwing away 1000 lines of code - Ken Thompson -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] Shed Skin (restricted) Python-to-C++ compiler 0.0.27
Of course I forgot to add the URL: http://shedskin.googlecode.com Mark Dufour. -- One of my most productive days was throwing away 1000 lines of code - Ken Thompson -- http://mail.python.org/mailman/listinfo/python-list
Re: PHP Developer highly interested in Python (web development) with some open questions...
On 24 Feb, 14:33, Tamer Higazi [EMAIL PROTECTED] wrote: Not true! you can disassemble the app and then have fun reading, not that easy. I simply want that nobody reads the sourcecode or better said the content of the python files I would have generated. Some quick answers: http://wiki.python.org/moin/HowDoYouProtectSource [...] Still I will have to look a lot for Python libraries which give me the same hardcore feeling like ezComponent (ez.no). http://wiki.python.org/moin/WebProgramming I think Python is great! And I will soon dive there in! :) Great! What is the difference between Ruby and Python? Can anyone say that to me? http://wiki.python.org/moin/PythonVsRuby Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: mapping problem
yes
you guessed perfectly
I'm not a native English speaker
sorry for my poor english..
On Feb 16, 6:35 pm, Steven D'Aprano [EMAIL PROTECTED]
cybersource.com.au wrote:
On Sat, 16 Feb 2008 01:35:32 -0800,MrShorewrote:
I've now crawled the meta infor,but with multi name all means the same
thing,
such as MS,microsoft,microsoft corporation all means the same thing, how
can I mapping words like this to the same thing?
The same way you would map anything: use a dict.
You know, sometimes I'm astounded by the ability of the human brain to
find semantic meaning in what is grammatically and syntactically
gibberish. Most of the words are English, but putting them all together
makes no sense. And yet, by interpolating between key words, I can guess
that the poster wants something like this:
mapping = {MS: Microsoft, Microsoft: Microsoft,
Microsoft Corporation: Microsoft}
If I have guessed poorly, could you please try again, more carefully? If
you're not a native English speaker, please say so and we'll make
allowances, and if you are a native English speaker with no cognitive
disabilities, you should be ashamed of wasting our time with such poor
communication.
--
Steven
who is unapologetic for being grumpy about the oxygen-thieves using the
Internet these days, and if that makes me a curmudgeon, so be it.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Seeing locals() from imported function
This is one of these times when I feel so dumb and ashamed that I wished I never dared to ask... Well, that did the trick. Thanks! luis On Feb 24, 3:41 am, 7stud [EMAIL PROTECTED] wrote: Yes, define your functions so that they get all the input they need from the arguments that are passed in. -- http://mail.python.org/mailman/listinfo/python-list
Re: mapping problem
On Feb 16, 6:35 pm, Steven D'Aprano [EMAIL PROTECTED]
cybersource.com.au wrote:
On Sat, 16 Feb 2008 01:35:32 -0800,MrShorewrote:
I've now crawled the meta infor,but with multi name all means the same
thing,
such as MS,microsoft,microsoft corporation all means the same thing, how
can I mapping words like this to the same thing?
The same way you would map anything: use a dict.
You know, sometimes I'm astounded by the ability of the human brain to
find semantic meaning in what is grammatically and syntactically
gibberish. Most of the words are English, but putting them all together
makes no sense. And yet, by interpolating between key words, I can guess
that the poster wants something like this:
mapping = {MS: Microsoft, Microsoft: Microsoft,
Microsoft Corporation: Microsoft}
If I have guessed poorly, could you please try again, more carefully? If
you're not a native English speaker, please say so and we'll make
allowances, and if you are a native English speaker with no cognitive
disabilities, you should be ashamed of wasting our time with such poor
communication.
--
Steven
who is unapologetic for being grumpy about the oxygen-thieves using the
Internet these days, and if that makes me a curmudgeon, so be it.
in fact what I expected is a solution which can automatically do the
job
maybe something related with artificial intelligence
but seems feasible to do it manually
thx for all
and pre say sorry if my english once again caused your uncomfortable
in understanding.
--
http://mail.python.org/mailman/listinfo/python-list
_struct in Python 2.5.2
Hi, I am trying to run this application http://svn.navi.cx/misc/trunk/python/bemused/ on uNSLUng Linux 6.10 using the optware python packages. As I obtained segmentation faults using Python 2.4, I have upgraded to 2.5.2. Now the execution terminates a lot earlier with this error message: File /usr/local/bemused_mpd/bemused-mpd.py, line 33, in module import bemused File /usr/local/bemused_mpd/bemused.py, line 27, in module import bluetooth, syslog File /opt/lib/python2.5/site-packages/bluetooth.py, line 2, in module import struct File /opt/lib/python2.5/struct.py, line 30, in module from _struct import Struct, error ImportError: No module named _struct I found out that there has been a file named _struct.so in 2.5.1 but it has disappeared in 2.5.2. With no package available for downgrading to 2.5.1 and no idea how to resolve this I am stuck at this point. Any help appreciated. Thank you Olaf -- http://mail.python.org/mailman/listinfo/python-list
Re: asynchronous alarm
Paul Rubin wrote:
a = Event()
Thread(target=f, args=(a,)).start()
raw_input('hit return when done: ')
a.set()
Simple and elegant.
Thank you.
Alan
--
http://mail.python.org/mailman/listinfo/python-list
Re: Seeing locals() from imported function
Luis M. González wrote: This is one of these times when I feel so dumb and ashamed that I wished I never dared to ask... Well, that did the trick. Thanks! luis On Feb 24, 3:41 am, 7stud [EMAIL PROTECTED] wrote: Yes, define your functions so that they get all the input they need from the arguments that are passed in. No need. You are allowed to learn. If you come back with the same question ina week's time, *then* you can expect trouble ;-) regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Article of interest: Python pros/cons for the enterprise
Just some anecdotal confirmation: In article [EMAIL PROTECTED], Ryan Ginstrom [EMAIL PROTECTED] wrote: I personally used C++ for about 90% of my code for 10 years. During that time, I was chugging the C++ Kool-Aid so hard I almost peed myself. I still think that C++ is a beautiful language, but I have also come to think that starting a program with C++ is a premature optimization. Yes, I came to the same conclusion and now start all projects in Python, then add C/C++ extensions for optimization. I think that very few Python programmers today started with Python. Most of them came to Python for a reason. Exactly right in my case. In fact this observation is directly related to the one your the previous paragraph. Python is a good language in which to start a progrom. -- -- Lou Pecora -- http://mail.python.org/mailman/listinfo/python-list
Re: some questions about ejabberd,spark and psi
the url missed http://allforces.com/2005/05/06/ichat-to-msn-through-jabber/ On 2月25日, 上午12时01分, Mr Shore [EMAIL PROTECTED] wrote: hi,every buddy I've now installed a jabber server,right it's ejabberd mentioned above and 2 jabber client,right again it's spark and psi and I can connect to jabber server by spark but failed by psi,saying 'certificate failed the authenticity test;Reason:certificate is self signed' and i follow this page to try to transport to MSN but once again failed the jabber server provided is obsolete so could anyone provide a valid jabber server? the third next is about the transport to MSN from ejabberd i'm running windowx XP os,with python vertion 2.5 I downloaded the pyMSNT for windows but only to find it supports only vertion 2.2 so is there any other way to transport to MSN besides pyMSNT? any advice will be appreciated:) -- http://mail.python.org/mailman/listinfo/python-list
Re: Article of interest: Python pros/cons for the enterprise
In article [EMAIL PROTECTED], Nicola Musatti [EMAIL PROTECTED] wrote: On Feb 22, 12:07 pm, Paul Rubin http://[EMAIL PROTECTED] wrote: Nicola Musatti [EMAIL PROTECTED] writes: In C++ memory is just another resource which you can handle just like any other one, possibly using RAII. Ok, I'll bite. Here's a straightforward Python expression: a = [f(x) + g(y) for x,y in izip(m1, m2) if h(x,y).frob() == 7] Consider how many intermediate objects are being allocated in figuring out that listcomp. Do you REALLY want to manage all the deallocation with something like RAII? What makes you think that a translation of a similar expression would involve explicit dynamic allocation at all? Barring bugs, here's an equivalent example: #include iostream #include map #include vector [cut a lot of C++ code] I realize the original point was about dynamic allocation and GC, but for me the raw juxtaposition of the *one* line of clear Python code with the equivalent mass of C++ code is shocking. Thanks for that. -- -- Lou Pecora -- http://mail.python.org/mailman/listinfo/python-list
Re: simpleparse - what is wrong with my grammar?
Laszlo Nagy wrote: The program below gives me segmentation fault (core dumped). Environment: Linux gandalf-desktop 2.6.20-16-generic #2 SMP Tue Feb 12 05:41:34 UTC 2008 i686 GNU/Linux Python 2.5.1 What is wrong with my grammar? Can it be an internal error in simpleparse? There's no way to tell from here. It's almost certainly a problem with simpleparse. Can you contact the developers of simpleparse? There is more you can do on your own: Use a debugger or prints to decide which python line is causing this. (Almost certainly the parse.parse, but *make sure* of that ...) Then start reducing your grammar bit-by-bit until you get a working grammar and so narrow in on the portion that's causing this problem. This way, you may answer your own question, or provide enough information to motivate any knowledgeable volunteers to actually volunteer their time. Good luck. Gary Herron Thanks, Laszlo from simpleparse.common import numbers, strings, comments from simpleparse.parser import Parser declaration = r''' expr:= paren_expr/unop_expr/binop_expr/word paren_expr := (,expr,) unop_expr := unop,expr binop_expr := expr,binop,expr unop:= (+/-) binop := (|//@) word:= [a-zA-Z], [a-zA-Z0-9_]* ''' parser = Parser( declaration) success, resultTrees, nextCharacter = parser.parse(testword,production=expr,processor=None) print success -- http://mail.python.org/mailman/listinfo/python-list
some questions about ejabberd,spark and psi
hi,every buddy I've now installed a jabber server,right it's ejabberd mentioned above and 2 jabber client,right again it's spark and psi and I can connect to jabber server by spark but failed by psi,saying 'certificate failed the authenticity test;Reason:certificate is self signed' and i follow this page to try to transport to MSN but once again failed the jabber server provided is obsolete so could anyone provide a valid jabber server? the third next is about the transport to MSN from ejabberd i'm running windowx XP os,with python vertion 2.5 I downloaded the pyMSNT for windows but only to find it supports only vertion 2.2 so is there any other way to transport to MSN besides pyMSNT? any advice will be appreciated:) -- http://mail.python.org/mailman/listinfo/python-list
Re: Article of interest: Python pros/cons for the enterprise
Matthew Woodcraft wrote: Jeff Schwab [EMAIL PROTECTED] wrote: Matthew Woodcraft wrote: I see. Then, unless you don't care about data loss passing silently, this 'most traditional' way to open a file is unsuitable for files opened for writing. No, why would you think so? If you want something special to happen when the close() fails (as you indeed would if you were writing important data), you have to say somehow that you want your special code called. What syntax would you like to see? Here's what the C++ would look like, supposing you have a type LoggingCloser that calls close and logs any failure: Sure, but this LoggingCloser isn't what you described as the 'most traditional, easiest way to open a file in C++'. It's not there to open the file, it's there to check the error code on close. That's what you said you wanted. The more general point is that, where you want to take action on cleanup and you need to handle errors from this action, it usually isn't enough to have one class per type of resource which knows what clean up action is required (because the required response to the error usually varies). If there is variation, you can either pass some data to the responsible object's constructor, or you can give it policies for what to do in different situations. http://en.wikipedia.org/wiki/Policy-based_design Additionally, in languages where exceptions are the usual way to report errors but exceptions from destructors are not managed pleasantly, the error recovery code can't use the language's normal mechanisms for dealing with the error response. Huh? Why not? -- http://mail.python.org/mailman/listinfo/python-list
Developing Techniques (and naming conventions)
I have some questions... Say we have a package food food/ __init__.py ham.py cheese.py Is it possible to have a file named food.py in the package and have non-referential imports work? i.e., for ham.py to have a line import food.food. From my experience, python will not work with this. Alright, new scenario. Say we had: food.py food/ __init__.py ham.py cheese.py where food.py is a script that uses the package food. Is it possible for this to work in any way? Every time I try to run food.py, python tries to import everything from the script instead of from the package. How can I fix this? -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a open souce IDE writen by C( C++) or partly writen by C( C++)?
On Feb 24, 11:23 am, zaley [EMAIL PROTECTED] wrote: On Feb 24, 6:48 am, Ricardo Aráoz [EMAIL PROTECTED] wrote: Lie wrote: On Feb 23, 4:02 pm, zaley [EMAIL PROTECTED] wrote: On Feb 22, 11:06 pm, Jesper polluks(#at#)post.tele.dk wrote: Give PyScripter fromhttp://www.mmm-experts.com/atry It is for Windows, though it is written in Delphi and not in C/C++ /Jesper zaley [EMAIL PROTECTED] skrev i en meddelelsenews:[EMAIL PROTECTED] Of course, python scripts debugger On 2ÔÂ22ÈÕ, ÏÂÎç3ʱ22·Ö, zaley [EMAIL PROTECTED] wrote: My project need a simple scripts debugger . I hope I can find something instructive Stefan Behnel дµÀ£º zaley wrote: Is there a open souce IDE writen by C( C++) or partly writen by C( C+ +)? Tons of them. What do you want to do with it? Stefan- Hide quoted text - - Show quoted text - But PyScripter is not a open source project Am I correct to say that the reason why you wanted an open source C++ IDE is because you wanted the freedom to modify your own programming environment? From the About window in PyScripter : A freeware, open source Python scripter integrated development environment created with the ambition to bring to the Python community the quality and functionality available in commercial IDEs available for other languages. So I think we could say PyScripter IS an open source project.- Hide quoted text - - Show quoted text - Really, what I want to do is that scripts can be executed step by step . I know By Py_Runstring clauses in main function can executed by step . But I can't know how to step into a function and how to step in a function. So I hope I can find something helpful in open source IDE for python. IDLE (and all IDE's I know) can run programs step-by-step. In IDLE, you've got to open the debug dialog (Debug - Debugger). After opening the debug dialog, you run your programs like normal and your program execution would be halted on the first command until you navigate yourself through the debug dialog. The debug dialog has a few buttons: Go, Step, Over, Out, Quit. Go means your program would run until it met a breakpoint[1], Step means your program would execute the next instruction, Over means your program would execute until the next instruction in the same level (you'll see what I meant after you played around it for a while), Out means your program would execute until it goes out of the current level, and Quit is like giving a KeyboardInterrupt (it stops program execution) [1] Set a breakpoint by right-clicking on a code line then select set breakpoint. -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
Lie wrote: On Feb 18, 1:25 pm, Carl Banks [EMAIL PROTECTED] wrote: On Feb 17, 1:45 pm, Lie [EMAIL PROTECTED] wrote: Any iteration with repeated divisions and additions can thus run the denominators up. This sort of calculation is pretty common (examples: compound interest, numerical integration). Wrong. Addition and subtraction would only grow the denominator up to a certain limit I said repeated additions and divisions. Repeated Addition and subtraction can't make fractions grow infinitely, only multiplication and division could. On what basis is this claim made? (n1/d1) + (n2/d2) = ((n1*d2) + (n2*d1)) / (d1*d2) If d1 and d2 are mutually prime (have no common factors) then it is impossible to reduce the resulting fraction further in the general case (where n1 = n2 = 1, for example). Anyways, addition and subtraction can increase the denominator a lot if for some reason you are inputing numbers with many different denominators. Up to a certain limit. After you reached the limit, the fraction would always be simplifyable. Where does this magical limit appear from? If the input numerator and denominator have a defined limit, repeated addition and subtraction to another fraction will also have a defined limit. Well I suppose is you limit the input denominators to n then you have a guarantee that the output denominators won't exceed n!, but that seems like a pretty poor guarantee to me. Am I wrong here? You seem to be putting out unsupportable assertions. Please justify them or stop making them. regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Feb 18, 1:25 pm, Carl Banks [EMAIL PROTECTED] wrote: On Feb 17, 1:45 pm, Lie [EMAIL PROTECTED] wrote: Any iteration with repeated divisions and additions can thus run the denominators up. This sort of calculation is pretty common (examples: compound interest, numerical integration). Wrong. Addition and subtraction would only grow the denominator up to a certain limit I said repeated additions and divisions. Repeated Addition and subtraction can't make fractions grow infinitely, only multiplication and division could. Anyways, addition and subtraction can increase the denominator a lot if for some reason you are inputing numbers with many different denominators. Up to a certain limit. After you reached the limit, the fraction would always be simplifyable. If the input numerator and denominator have a defined limit, repeated addition and subtraction to another fraction will also have a defined limit. -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Feb 25, 12:46 am, Steve Holden [EMAIL PROTECTED] wrote: Lie wrote: On Feb 18, 1:25 pm, Carl Banks [EMAIL PROTECTED] wrote: On Feb 17, 1:45 pm, Lie [EMAIL PROTECTED] wrote: Any iteration with repeated divisions and additions can thus run the denominators up. This sort of calculation is pretty common (examples: compound interest, numerical integration). Wrong. Addition and subtraction would only grow the denominator up to a certain limit I said repeated additions and divisions. Repeated Addition and subtraction can't make fractions grow infinitely, only multiplication and division could. On what basis is this claim made? (n1/d1) + (n2/d2) = ((n1*d2) + (n2*d1)) / (d1*d2) If d1 and d2 are mutually prime (have no common factors) then it is impossible to reduce the resulting fraction further in the general case (where n1 = n2 = 1, for example). Anyways, addition and subtraction can increase the denominator a lot if for some reason you are inputing numbers with many different denominators. Up to a certain limit. After you reached the limit, the fraction would always be simplifyable. Where does this magical limit appear from? If the input numerator and denominator have a defined limit, repeated addition and subtraction to another fraction will also have a defined limit. Well I suppose is you limit the input denominators to n then you have a guarantee that the output denominators won't exceed n!, but that seems like a pretty poor guarantee to me. Am I wrong here? You seem to be putting out unsupportable assertions. Please justify them or stop making them. Well, I do a test on my own fraction class. I found out that if we set a limit to the numerators and denominators, the resulting output fraction would have limit too. I can't grow my fraction any more than this limit no matter how many iteration I do on them. I do the test is by something like this (I don't have the source code with me right now, it's quite long if it includes the fraction class, but I think you could use any fraction class that automatically simplify itself, might post the real code some time later): while True: a = randomly do (a + b) or (a - b) b = random fraction between [0-100]/[0-100] print a And this limit is much lower than n!. I think it's sum(primes(n)), but I've got no proof for this one yet. -- http://mail.python.org/mailman/listinfo/python-list
Re: Developing Techniques (and naming conventions)
Adekoba wrote: food.py food/ __init__.py ham.py cheese.py where food.py is a script that uses the package food. Is it possible for this to work in any way? Every time I try to run food.py, python tries to import everything from the script instead of from the package. How can I fix this? Move the code from food.py to food/__init__.py. You can't have a package and a module with the same name. Christian -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Feb 24, 1:09 pm, Lie [EMAIL PROTECTED] wrote: And this limit is much lower than n!. I think it's sum(primes(n)), but I've got no proof for this one yet. It's the least common multiple of the integers 1 through n, or equivalently the product over all primes p = n of the highest power of p not exceeding n. So for n = 100, it's: 64 * 81 * 25 * 49 * 11 * 13 * 17 * ... rest of primes up to 100. For general n, this number is of roughly the same order of magnitude as e**n. See http://www.research.att.com/~njas/sequences/A003418 for more. Mark -- http://mail.python.org/mailman/listinfo/python-list
most loved template engine on python is?
Hi people! After deciding choosing python as my future killer application language for writing web applications, I need from you guys still some support, if you apologize. Question: Which is the most loved template engine for python? I see, that I can do more aspect oriented programming with python as with ruby (as comparing those languages). God thanks, I do not have to create an object for every small thing in python and still generate classes and access methods statically. Tamer -- http://mail.python.org/mailman/listinfo/python-list
Re: Python for web...
http://www.djangobook.com/ if you love to read that book online. Otherwise, if you don't have DSL, just mirror the site for offline usage with wget Tamer [EMAIL PROTECTED] wrote: Hi everyone, I have to develop a web based enterprise application for my final year project. Since i am interested in open source, i searched the net. Almost 90% of them were PHP and MySQL. Cant we use python for that ? I tried several sites, but there is not enough tutorial for beginners [mod_python, PSP etc]. I couldnt find any detailed book, not even a single book :( All the python books are covering only CGI part) Any suggestions? Any recommended book? Execuse my English. Thushanthan. -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Feb 25, 1:21 am, Mark Dickinson [EMAIL PROTECTED] wrote: On Feb 24, 1:09 pm, Lie [EMAIL PROTECTED] wrote: And this limit is much lower than n!. I think it's sum(primes(n)), but I've got no proof for this one yet. It's the least common multiple of the integers 1 through n, or equivalently the product over all primes p = n of the highest power of p not exceeding n. So for n = 100, it's: 64 * 81 * 25 * 49 * 11 * 13 * 17 * ... rest of primes up to 100. For general n, this number is of roughly the same order of magnitude as e**n. Ah, yes, I meant product(primes(n)), please forgive my honest mistake which is partially caused by me not supposed to still be awake at this time of the day. And thanks for Mark for noticing the mistake, and here is the code I used: import fraction import random frac = fraction.frac ops = (frac.__add__, frac.__sub__) a = frac(random.randrange(1, 10), random.randrange(1, 10)) b = frac(random.randrange(1, 10), random.randrange(1, 10)) while True: o = ops[random.randrange(0, 2)] a = o(a, b) b = frac(random.randrange(1, 10), random.randrange(1, 10)) print a I decided to keep the num/den limit low (10) because higher values might obscure the fact that it do have limits. And through further observations, I think it is sufficient if the limit is imposed in the denominator only (numerator can have any values it wanted to, denominator growth is determined only by the limit of denominator growth). I think I'll also post the code for the fraction class I used, if you have other fraction class that can automatically simplify, you could use that instead as this class suffers from a naive GCD implementation: fraction.py from __future__ import division def GCD(a, b): if b == 0: return a return GCD(b, a % b) class frac: ''' Fraction Class A fraction class. Attributes: num - the numerator of a fraction den - the denominator of a fraction Methods: add(a, b) - add fraction a to fraction b and return a new fraction sub(a, b) - subtract fraction b from fraction a and return a new fraction mul(a, b) - multiply fraction a with fraction b and return a new fraction div(a, b) - divides fraction b from fraction a and return a new fraction invert(a) - invert the fraction (switch the numerator and denominator) neg(a) - negates the fraction (negates numerator) powr(a, b) - raise fraction a to the power of b simplify(a, b) - simplify fraction to its canonical representation __init__(a, b) - creates a new fraction __str__(a, b) - returns a string representation. Mixed fraction if possible __repr__(a, b) - returns a string representation. Always return vulgar fraction Operators: Conversion to fractions will be done automatically whenever possible, in-place operation is fully supported. Both regular and reflected operation is supported. a + b - Calls frac.add(a, b) a - b - Calls frac.sub(a, b) a * b - Calls frac.mul(a, b) a / b - Calls frac.div(a, b) a // b - Floors the resulting fraction from frac.div(a, b) -a - Negates a fraction +a - Returns a copy of the fraction ~a - Return the reciprocal of a Comparisons: Implemented through __cmp__(a, b), no rich comparison. a == b - a equals b a != b - a not equal b a b - a greater than b a b - a less than b a = b - a greater than or equal to b a = b - a less than or equal to b Casting: __complex__ - Converts the fraction to floats and return the result as complex number __int__ - Returns the whole part of the fraction in Integer __long__- Returns the whole part of the fraction in Long __float__ - Returns the value of the fractino in Float Exceptions: ZeroDenominatorError - A fraction cannot have zero as its denominator Bugs: - At the meantime, the fraction class doesn't mix well if used together with floating type numbers. Inline operators and initializers implicitly assumed that numbers are either integers or fraction. So if there are operations involving floating point or you initialized a fraction with a floating point number, the result would be something like a floating point fraction. ''' def __init__(self, a = 0, b = 1): dev = GCD(a, b) if b 0: self.num = a // dev elif b 0: self.num = -a // dev else: raise frac.ZeroDenominatorError self.den = abs(b) // dev def simplify(self): dev = GCD(self.num, self.den) self.num //= dev
Re: simpleparse - what is wrong with my grammar?
Laszlo Nagy wrote: The program below gives me segmentation fault (core dumped). Environment: Linux gandalf-desktop 2.6.20-16-generic #2 SMP Tue Feb 12 05:41:34 UTC 2008 i686 GNU/Linux Python 2.5.1 What is wrong with my grammar? Can it be an internal error in simpleparse? You've created an infinitely recursing grammar. SimpleParse is a straightforward recursive descent parser without look-ahead (unless explicitly coded) or ambiguity resolution. You are asking it to parse expr to see if expr,binop,expr is matched. It will continue recursing down into expr until it runs out of ram or otherwise encounters a system-level fault. You need to disambiguate your grammar to have it work with SimpleParse. How you do that will depend on what you really meant by expr,binop,expr: abc could be parsed as either: ((ab)c) or: (a(bc)) the following creates a parser that produces the first option (which is, I *think* what you wanted): expr:= (simple_expr,no_binop)/binop_expr binop_expr := simple_expr,binop_tail simple_expr := (paren_expr/unop_expr/word) no_binop := ?-binop/end end := EOF paren_expr := (,expr,) unop_expr := unop,expr binop_tail := binop,expr unop:= (+/-) binop := (|//@) word:= [a-zA-Z], [a-zA-Z0-9_]* the ?- lookahead is reasonably inefficient, but lookahead is always going around discarding partial results anyway, so it's no worse than most other formulations. HTH, Mike -- Mike C. Fletcher Designer, VR Plumber, Coder http://www.vrplumber.com http://blog.vrplumber.com -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: Phatch = PHoto bATCH processor and renamer based on PIL
I'm pleased to announce the release of Phatch which is a powerful batch processor and renamer. Phatch exposes a big part of the Python Imaging Library through an user friendly GUI. (It is using python-pyexiv2 to offer more extensive EXIF and IPTC support.) Phatch is not targeted at manipulating individual pictures (such as with Gimp), but repeating the same actions on hundreds or thousands of images. If you know PIL and have some nice recipes laying around, it is very easy to write plugins as Phatch generates the corresponding GUI automagically just like in Django. Any existings PIL scripts can be added very easily. Let me know if you want to contribute or have any questions. Homepage: http://photobatch.stani.be (free download link below) Tutorials: http://photobatch.wikidot.com/tutorials Translations: https://translations.launchpad.net/phatch/trunk/+pots/phatch License: GPLv3 Screenshot: http://photobatch.wikidot.com/local--files/start/Screenshot-Phatch3d.jpg (the perspective and reflection is produced by Phatch itself) Phatch has many features, like: - EXIF information inspector with thumbnail - limit jpeg file size when saving - tons of actions organized by tags (including perspective, round corners, shadow, reflection, ...) - console version (Phatch can now run without a gui on servers) - batch rename and copy files based on exif metadata - data stamping (http://photobatch.wikidot.com) - online documentation wiki (http://photobatch.wikidot.com) Linux only features: - desktop or panel droplets on which images or folders can be dropped (will be ported to Windows Mac) - Nautilus and desktop integration (with its own mime type and nautilus extension) - manpage with examples With python-pyexiv2 the following featues are added: - embedding the original EXIF and IPTC tags in the image All actions mostly have a separate pil function in their source code, so they could be read as a recipe book for PIL: * Auto Contrast - Maximize image contrast * Background - Put colour under transparent image * Border - Crop or add border to all sides * Brightness - Adjust brightness from black to white * Canvas - Crop the image or enlarge canvas without resizing the image * Colorize - Colorize grayscale image * Common - Copies the most common pixel value * Contrast - Adjust from grey to black white * Convert Mode - Convert the color mode of an image (grayscale, RGB, RGBA or CMYK) * Copy - Copy image file * Effect - Blur, Sharpen, Emboss, Smooth, ... * Equalize - Equalize the image histogram * Fit - Downsize and crop image with fixed ratio * Grayscale - Fade all colours to gray * Invert - Invert the colors of the image (negative) * Maximum - Copies the maximum pixel value * Mask - Apply a transparency mask * Median - Copies the median pixel value * Minimum - Copies the minimum pixel value * Offset - Offset by distance and wrap around * Posterize - Reduce the number of bits of colour channel * Perspective - Shear 2d or 3d * Rank - Copies the rank'th pixel value * Reflect - Drops a reflection * Rename - Rename image file * Rotate - Rotate with random angle * Round - Round or crossed corners with variable radius and corners * Saturation - Adjust saturation from grayscale to high * Save - Save an image with variable compression in different types * Scale - Scale an image with different resample filters. * Shadow - Drop a blurred shadow under a photo with variable position, blur and color * Solarize - Invert all pixel values above threshold * Text - Write text at a given position * Transpose - Flip or rotate an image by 90 degrees * Watermark - Apply a watermark image with variable placement (offset, scaling, tiling) and opacity I develop Phatch on Ubuntu/Linux, but I have tested and polished it regularly on Windows and Mac Os X. (Only the droplet functionality needs to be ported.) Phatch is submitted to Debian unstable and Ubuntu Hardy. Packagers for other platforms are welcome. Requirements: - PIL 1.1.5 or higher - wxPython 2.6 or higher - pyexiv2 (optional) - python nautilus bindings (optional) Now that we are at image manipulation does anyone know of a good, possibly python based, image manipulation tool that can do the same as the windows tool andrea mosaic? http://www.andreaplanet.com/andreamosaic/samples/ Stani, if this is a good place for feature requests I would like to add it :) Cheers, Daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: Developing Techniques (and naming conventions)
On Feb 24, 1:06 pm, Christian Heimes [EMAIL PROTECTED] wrote: Adekoba wrote: food.py food/ __init__.py ham.py cheese.py where food.py is a script that uses the package food. Is it possible for this to work in any way? Every time I try to run food.py, python tries to import everything from the script instead of from the package. How can I fix this? Move the code from food.py to food/__init__.py. You can't have a package and a module with the same name. Christian So it is not possible? I don't think moving food.py's code to __init__.py would work out to well, because then how would I run the script? -- http://mail.python.org/mailman/listinfo/python-list
Re: _struct in Python 2.5.2
I found out that there has been a file named _struct.so in 2.5.1 but it has disappeared in 2.5.2. With no package available for downgrading to 2.5.1 and no idea how to resolve this I am stuck at this point. Any help appreciated. Where did you get your copy of Python 2.5.2 from, and how did you install it? _struct should be there; if it isn't, something went wrong during the installation. Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
Re: most loved template engine on python is?
After deciding choosing python as my future killer application language for writing web applications, I need from you guys still some support, if you apologize. Question: Which is the most loved template engine for python? AFAIK, there is no single blessed template system. If you're up to web development then your choice of framework will limit the choices for template engines. For example if you choose Django I guess you'll have to stick with its built-in template system (I might be wrong on this) while if you choose turbogears you can choose between, genshi, kid, myghty and some others. If you don't have your own preferences the best bet is choosing the default template system that comes with your choice of web framework. With turbogears 1 it means kid, with turbogears 2 it means genshi. For more info please see http://wiki.python.org/moin/Templating I see, that I can do more aspect oriented programming with python as with ruby (as comparing those languages). God thanks, I do not have to create an object for every small thing in python and still generate classes and access methods statically. -- http://mail.python.org/mailman/listinfo/python-list
Re: most loved template engine on python is?
AFAIK, there is no single blessed template system. If you're up to web development then your choice of framework will limit the choices for template engines. For example if you choose Django I guess you'll have to stick with its built-in template system (I might be wrong on this) Django's templating system comes built-in when you install Django, but it's just a module like any other Python module. Django views all just return strings (or iterables), so you can easily include your favorite templating engine if the default doesn't do it for you. Including genshi, kid, myghty and some others. I've even (in a fit of laziness during a mockup) used python's dictionary string formatting for a fast templating solution. For more info please see http://wiki.python.org/moin/Templating They're are many to choose from, so pick one that works for you, and it should plug fairly easily into your framework of choice. -tkc -- http://mail.python.org/mailman/listinfo/python-list
urllib slow on Leopard
I've recently switched from Ubuntu to OS X Leopard. I have some python
scripts which download info from the web. The scripts were working fine
before on Ubuntu, but urllib seems to work really slowly on Leopard.
I tried an example from the docs:
import urllib2
f = urllib2.urlopen('http://www.python.org/')
print f.read(100)
!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN
http://www.w3.org/TR/xhtml1/DTD/xhtm
The line f = ... takes about a minute to return - but otherwise returns
the predicted result. My web connection seems fine, so has anyone got
any ideas as to what the problem might be?
--
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Re: Article of interest: Python pros/cons for the enterprise
On Feb 21, 10:22 am, Nicola Musatti [EMAIL PROTECTED] wrote: On Feb 21, 6:31 pm, Paul Boddie [EMAIL PROTECTED] wrote: The main reason why C++ has declined in usage is because almost everything of practical value is optional. No, disagree. The main reason why C++ has declined in usage is because it never got the kind of corporate marketing enjoyed by Java and C#. I'm inclined to disagree for two reasons. C++ is a very complex language. Java (and the later C#) less so. Couple that with reduced debugging time due to garbage collection and fewer pointer problems, a lot of us decided a factor of 2x in personal productivity was worth it. Runtime was initially an impediment, and still is for desktop applications, but the trade was worth it. Corporate marketing, and corporate attention in general, saw to it that Java was well equipped with libraries and frameworks addressing enterprise application needs. ...but the *big* reason Java won over C+ + is because your application became stable sooner. ...with arguably fewer problems later. And the migration to Python is due in large part because of an additional factor of 3-4x in personal productivity (over Java). Improvements in runtime performance wouldn't hurt, but for many applications that's not an issue. (If optional data typing were offered, Python's penetration in the enterprise space would be even higher, and I suspect there would be performance gains as well.) Larry -- http://mail.python.org/mailman/listinfo/python-list
Re: Article of interest: Python pros/cons for the enterprise
Larry Bugbee wrote: And the migration to Python is due in large part because of an additional factor of 3-4x in personal productivity (over Java). Improvements in runtime performance wouldn't hurt, but for many applications that's not an issue. (If optional data typing were You mean static data typing, right? Are there any known holes in the dynamic type system that still need to be plugged? (I haven't heard of any.) offered, Python's penetration in the enterprise space would be even higher, and I suspect there would be performance gains as well.) -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Feb 24, 1:09�pm, Lie [EMAIL PROTECTED] wrote: On Feb 25, 1:21 am, Mark Dickinson [EMAIL PROTECTED] wrote: On Feb 24, 1:09 pm, Lie [EMAIL PROTECTED] wrote: And this limit is much lower than n!. I think it's sum(primes(n)), but I've got no proof for this one yet. It's the least common multiple of the integers 1 through n, or equivalently the product over all primes p = n of the highest power of p not exceeding n. �So for n = 100, it's: 64 * 81 * 25 * 49 * 11 * 13 * 17 * ... rest of primes up to 100. For general n, this number is of roughly the same order of magnitude as e**n. Ah, yes, I meant product(primes(n)), please forgive my honest mistake which is partially caused by me not supposed to still be awake at this time of the day. And thanks for Mark for noticing the mistake, and here is the code I used: import fraction import random frac = fraction.frac ops = (frac.__add__, frac.__sub__) a = frac(random.randrange(1, 10), random.randrange(1, 10)) b = frac(random.randrange(1, 10), random.randrange(1, 10)) while True: � � o = ops[random.randrange(0, 2)] � � a = o(a, b) � � b = frac(random.randrange(1, 10), random.randrange(1, 10)) � � print a I decided to keep the num/den limit low (10) because higher values might obscure the fact that it do have limits. And through further observations, I think it is sufficient if the limit is imposed in the denominator only (numerator can have any values it wanted to, denominator growth is determined only by the limit of denominator growth). I think I'll also post the code for the fraction class I used, if you have other fraction class that can automatically simplify, you could use that instead as this class suffers from a naive GCD implementation: Out of curiosity, of what use is denominator limits? The problems where I've had to use rationals have never afforded me such luxury, so I don't see what your point is. -- http://mail.python.org/mailman/listinfo/python-list
Re: Developing Techniques (and naming conventions)
-On [20080224 20:01], Adekoba ([EMAIL PROTECTED]) wrote: I don't think moving food.py's code to __init__.py would work out to well, because then how would I run the script? import food Which in turn has something like this in food/__init__.py: from food.cheese import gouda from food.ham import parma __all__ = ['gouda', 'parma'] and in turn in your script you can now use food.gouda and food.parma. Unless I totally misunderstood what you are trying to achieve. -- Jeroen Ruigrok van der Werven asmodai(-at-)in-nomine.org / asmodai イェルーン ラウフロック ヴァン デル ウェルヴェン http://www.in-nomine.org/ | http://www.rangaku.org/ We have met the enemy and they are ours... -- http://mail.python.org/mailman/listinfo/python-list
Re: most loved template engine on python is?
On 24 fév, 20:01, Tamer Higazi [EMAIL PROTECTED] wrote: Hi people! (snip) Question: Which is the most loved template engine for python? I don't have a single cue on this, but the one that most impresses me so far is Mako. -- http://mail.python.org/mailman/listinfo/python-list
Re: Developing Techniques (and naming conventions)
On Feb 24, 3:21 pm, Jeroen Ruigrok van der Werven [EMAIL PROTECTED] nomine.org wrote: -On [20080224 20:01], Adekoba ([EMAIL PROTECTED]) wrote: I don't think moving food.py's code to __init__.py would work out to well, because then how would I run the script? import food Which in turn has something like this in food/__init__.py: from food.cheese import gouda from food.ham import parma __all__ = ['gouda', 'parma'] and in turn in your script you can now use food.gouda and food.parma. Unless I totally misunderstood what you are trying to achieve. -- Jeroen Ruigrok van der Werven asmodai(-at-)in-nomine.org / asmodai イェルーン ラウフロック ヴァン デル ウェルヴェンhttp://www.in-nomine.org/|http://www.rangaku.org/ We have met the enemy and they are ours... I was just curious if I could get a script name to be the same name as the package directory, but apparently it is not possible. Instead I think I am going to do something like: setup.py food/ __init__.py ham.py cheese.py scripts/ food and just set my PYTHONPATH to the parent directory. I have never done a full scale project before in python, but I think this is probably on track with what most people would do. -- http://mail.python.org/mailman/listinfo/python-list
Re: To PEAK or not to PEAK
On 24 fév, 15:37, Tzury Bar Yochay [EMAIL PROTECTED] wrote: I am about to start a large-scale enterprise project next month (I insist on using Python instead Java and .NET and I am sure `they` will thank me eventually). I was wondering around making my components-and-libraries-shopping- list and came across PEAK. My paranoia is that PEAK would make me write my application in PEAK instead of Python You should perhaps worry more about the support - IIRC, PEAK (as a whole I mean) is mostly abandon-ware... -- http://mail.python.org/mailman/listinfo/python-list
Re: PHP Developer highly interested in Python (web development) with some open questions...
On 24 fév, 13:44, Christian Heimes [EMAIL PROTECTED] wrote: Tamer Higazi wrote: - What is the Zope Applikation Server? Is it also a Webserver like the Apache or Tomcat Webserver? Zope is much more than a webserver. It's a web application server including a fast object database (ACID, support clustering and MVCC), a powerful plugin architecture, builtin security and many, many more. It's also some kind of a Rube Goldberg thingie... http://en.wikipedia.org/wiki/Rube_Goldberg_machine If you're into web applications, better to have a look at Pylons or Django IMHO. -- http://mail.python.org/mailman/listinfo/python-list
Re: urllib slow on Leopard
Try running the script when python is running as root. I has issues like
this also!
On Sun, Feb 24, 2008 at 8:57 PM, mark [EMAIL PROTECTED] wrote:
I've recently switched from Ubuntu to OS X Leopard. I have some python
scripts which download info from the web. The scripts were working fine
before on Ubuntu, but urllib seems to work really slowly on Leopard.
I tried an example from the docs:
import urllib2
f = urllib2.urlopen('http://www.python.org/'http://www.python.org/%27
)
print f.read(100)
!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN
http://www.w3.org/TR/xhtml1/DTD/xhtm
The line f = ... takes about a minute to return - but otherwise returns
the predicted result. My web connection seems fine, so has anyone got
any ideas as to what the problem might be?
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Re: urllib slow on Leopard
On Feb 24, 3:57 pm, mark [EMAIL PROTECTED] wrote:
I've recently switched from Ubuntu to OS X Leopard. I have some python
scripts which download info from the web. The scripts were working fine
before on Ubuntu, but urllib seems to work really slowly on Leopard.
I tried an example from the docs:
import urllib2
f = urllib2.urlopen('http://www.python.org/')
print f.read(100)
!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN
http://www.w3.org/TR/xhtml1/DTD/xhtm
The line f = ... takes about a minute to return - but otherwise returns
the predicted result. My web connection seems fine, so has anyone got
any ideas as to what the problem might be?
Nope, but it's not Leopard related. Just checked here and it loaded
in about 1 sec.
André
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Re: urllib slow on Leopard
mark wrote:
I've recently switched from Ubuntu to OS X Leopard. I have some python
scripts which download info from the web. The scripts were working fine
before on Ubuntu, but urllib seems to work really slowly on Leopard.
I tried an example from the docs:
import urllib2
f = urllib2.urlopen('http://www.python.org/')
print f.read(100)
!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN
http://www.w3.org/TR/xhtml1/DTD/xhtm
The line f = ... takes about a minute to return - but otherwise returns
the predicted result. My web connection seems fine, so has anyone got
any ideas as to what the problem might be?
It likely tries to load the DTD in the background, which requires network
access.
http://www.w3.org/blog/systeam/2008/02/08/w3c_s_excessive_dtd_traffic
Stefan
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Re: How about adding rational fraction to Python?
Out of curiosity, of what use is denominator limits? The problems where I've had to use rationals have never afforded me such luxury, so I don't see what your point is In Donald Knuth's The Art of Computer Programming, he described floating slash arithmetic where the total number of bits by the numerator and denominator was bounded. IIRC, a use case was matrix inversion. casevh -- http://mail.python.org/mailman/listinfo/python-list
Re: Python for web...
Hi All-- Django is slick. I just yesterday picked up the book and started poking away. Downloaded, Installed and running in about ten minutes (I have several servers I can play with). Today I have several working pages. Use mod_python if you can. Django-mind-Beginner's-mind-ly y'rs, Ivan On Sun, Feb 24, 2008 at 12:03 PM, Tamer Higazi [EMAIL PROTECTED] wrote: http://www.djangobook.com/ if you love to read that book online. Otherwise, if you don't have DSL, just mirror the site for offline usage with wget Tamer [EMAIL PROTECTED] wrote: Hi everyone, I have to develop a web based enterprise application for my final year project. Since i am interested in open source, i searched the net. Almost 90% of them were PHP and MySQL. Cant we use python for that ? I tried several sites, but there is not enough tutorial for beginners [mod_python, PSP etc]. I couldnt find any detailed book, not even a single book :( All the python books are covering only CGI part) Any suggestions? Any recommended book? Execuse my English. Thushanthan. -- http://mail.python.org/mailman/listinfo/python-list -- Ivan Van Laningham God N Locomotive Works http://www.pauahtun.org/ http://www.python.org/workshops/1998-11/proceedings/papers/laningham/laningham.html Army Signal Corps: Cu Chi, Class of '70 Author: Teach Yourself Python in 24 Hours -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a open souce IDE writen by C( C++) or partly writen by C( C++)?
zaley wrote: On Feb 24, 6:48 am, Ricardo Aráoz [EMAIL PROTECTED] wrote: Lie wrote: On Feb 23, 4:02 pm, zaley [EMAIL PROTECTED] wrote: On Feb 22, 11:06 pm, Jesper polluks(#at#)post.tele.dk wrote: Give PyScripter fromhttp://www.mmm-experts.com/atry It is for Windows, though it is written in Delphi and not in C/C++ /Jesper zaley [EMAIL PROTECTED] skrev i en meddelelsenews:[EMAIL PROTECTED] Of course, python scripts debugger On 2ÔÂ22ÈÕ, ÏÂÎç3ʱ22·Ö, zaley [EMAIL PROTECTED] wrote: My project need a simple scripts debugger . I hope I can find something instructive Stefan Behnel дµÀ£º zaley wrote: Is there a open souce IDE writen by C( C++) or partly writen by C( C+ +)? Tons of them. What do you want to do with it? Stefan- Hide quoted text - - Show quoted text - But PyScripter is not a open source project Am I correct to say that the reason why you wanted an open source C++ IDE is because you wanted the freedom to modify your own programming environment? From the About window in PyScripter : A freeware, open source Python scripter integrated development environment created with the ambition to bring to the Python community the quality and functionality available in commercial IDEs available for other languages. So I think we could say PyScripter IS an open source project.- Hide quoted text - - Show quoted text - Really, what I want to do is that scripts can be executed step by step . I know By Py_Runstring clauses in main function can executed by step . But I can't know how to step into a function and how to step in a function. So I hope I can find something helpful in open source IDE for python. Exactly so. PyScripter does it easy, besides you can have in different tabs all the modules of your application. You just hit the run button and your program runs, you hit the debug button and you start going step by step. It's free, easy to install, just give it a try and if you don't like it just trash it. -- http://mail.python.org/mailman/listinfo/python-list
Re: Developing Techniques (and naming conventions)
Adekoba wrote: On Feb 24, 1:06 pm, Christian Heimes [EMAIL PROTECTED] wrote: Adekoba wrote: food.py food/ __init__.py ham.py cheese.py where food.py is a script that uses the package food. Is it possible for this to work in any way? Every time I try to run food.py, python tries to import everything from the script instead of from the package. How can I fix this? Move the code from food.py to food/__init__.py. You can't have a package and a module with the same name. Christian So it is not possible? I don't think moving food.py's code to __init__.py would work out to well, because then how would I run the script? You run food/__init__.py with the following statement: import food regards Steve -- Steve Holden+1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Article of interest: Python pros/cons for the enterprise
PS: And tools like ShedSkin and Pyrex benefit. -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Sun, 24 Feb 2008 10:09:37 -0800, Lie wrote: On Feb 25, 12:46 am, Steve Holden [EMAIL PROTECTED] wrote: Lie wrote: On Feb 18, 1:25 pm, Carl Banks [EMAIL PROTECTED] wrote: On Feb 17, 1:45 pm, Lie [EMAIL PROTECTED] wrote: Any iteration with repeated divisions and additions can thus run the denominators up. This sort of calculation is pretty common (examples: compound interest, numerical integration). Wrong. Addition and subtraction would only grow the denominator up to a certain limit I said repeated additions and divisions. Repeated Addition and subtraction can't make fractions grow infinitely, only multiplication and division could. On what basis is this claim made? (n1/d1) + (n2/d2) = ((n1*d2) + (n2*d1)) / (d1*d2) If d1 and d2 are mutually prime (have no common factors) then it is impossible to reduce the resulting fraction further in the general case (where n1 = n2 = 1, for example). Anyways, addition and subtraction can increase the denominator a lot if for some reason you are inputing numbers with many different denominators. Up to a certain limit. After you reached the limit, the fraction would always be simplifyable. Where does this magical limit appear from? If the input numerator and denominator have a defined limit, repeated addition and subtraction to another fraction will also have a defined limit. Well I suppose is you limit the input denominators to n then you have a guarantee that the output denominators won't exceed n!, but that seems like a pretty poor guarantee to me. Am I wrong here? You seem to be putting out unsupportable assertions. Please justify them or stop making them. Well, I do a test on my own fraction class. I found out that if we set a limit to the numerators and denominators, the resulting output fraction would have limit too. I can't grow my fraction any more than this limit no matter how many iteration I do on them. I do the test is by something like this (I don't have the source code with me right now, it's quite long if it includes the fraction class, but I think you could use any fraction class that automatically simplify itself, might post the real code some time later): while True: a = randomly do (a + b) or (a - b) b = random fraction between [0-100]/[0-100] print a And this limit is much lower than n!. I think it's sum(primes(n)), but I've got no proof for this one yet. *jaw drops* Please stop trying to help convince people that rational classes are safe to use. That's the sort of help that we don't need. For the record, it is a perfectly good strategy to *artificially* limit the denominator of fractions to some maximum value. (That's more or less the equivalent of setting your floating point values to a maximum number of decimal places.) But without that artificial limit, repeated addition of fractions risks having the denominator increase without limit. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Sun, 24 Feb 2008 12:19:53 -0800, Mensanator wrote: Out of curiosity, of what use is denominator limits? The problems where I've had to use rationals have never afforded me such luxury, so I don't see what your point is. It ensures that your fraction's denominator doesn't grow indefinitely, at the cost of some precision. In principle, fraction denominators can grow exponentially. In practice, probably less quickly, but still quickly enough that people on this list have reported that adding two fractions lead to millions of digits in each denominator and massive paging as their computer struggled to perform the addition. The beauty of fractions is that they give you infinite precision. The danger of fractions is that it takes a lot of memory to store infinitely precise numbers :) Frankly, I think that for most real-world data, it's unlikely to be a problem, but Guido's experiences with ABC were the opposite. But then we don't know how naive the ABC fraction libraries were. For all I know they did this: 1/2 + 1/2 = 4/4 4/4 - 1/2 = 4/8 4/8 + 1/2 = 16/16 etc. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Article of interest: Python pros/cons for the enterprise
You mean static data typing, right? Are there any known holes in the dynamic type system that still need to be plugged? (I haven't heard of any.) My apologies. You are right, I meant optional, static typing. Thanks for the catch Jeff. Python's dynamic typing is just fine. But if I know the type, I want the ability to nail it. ...local variables, arguments, return values, etc And if I don't know or care, I'd leave it to dynamic typing. The need for a lot of doc goes away, those new to the language that think it's a big deal can be explicit, and as I suggested earlier, I think the byte code interpreter could be made a lot smarter and faster. ...and corporate acceptance would follow. Larry -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Sun, 24 Feb 2008 11:09:32 -0800, Lie wrote: I decided to keep the num/den limit low (10) because higher values might obscure the fact that it do have limits. You do realise that by putting limits on the denominator, you guarantee that the sum of the fractions also has a limit on the denominator? In other words, your test is useless. With denominators limited to 1 through 9 inclusive, the sum will have a denominator of 2*3*5*7 = 210. But that limit is a product (literally and figuratively) of your artificial limit on the denominator. Add a fraction with denominator 11, and the sum now has a denominator of 2310; add another fraction n/13 and the sum goes to m/30030; and so on. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: PHP Developer highly interested in Python (web development) with some open questions...
It's also some kind of a Rube Goldberg thingie... http://en.wikipedia.org/wiki/Rube_Goldberg_machine If you're into web applications, better to have a look at Pylons or Django IMHO. You are entitled to your opinion, but calling Zope a Rube-Goldberg-machine is strong. To put it mildly. How about sharing some of the reasons for this? Just for the record: I'm a Turbogears user and even commiter - so I'm certainly not from the zope zealotry department. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: n00b with urllib2: How to make it handle cookie automatically?
On Feb 24, 4:41 am, est [EMAIL PROTECTED] wrote: On Feb 23, 2:42 am, Rob Wolfe [EMAIL PROTECTED] wrote: est [EMAIL PROTECTED] writes: Hi all, I need urllib2 do perform series of HTTP requests with cookie from PREVIOUS request(like our browsers usually do ). Many people suggest I use some library(e.g. pycURL) instead but I guess it's good practise for a python beginner to DIY something rather than use existing tools. So my problem is how to expand the urllib2 class from cookielib import CookieJar class SmartRequest(): cj=CookieJar() def __init__(self, strUrl, strContent=None): self.Request = urllib2.Request(strUrl, strContent) self.cj.add_cookie_header(self.Request) self.Response = urllib2.urlopen(Request) self.cj.extract_cookies(self.Response, self.Request) def url def read(self, intCount): return self.Response.read(intCount) def headers(self, strHeaderName): return self.Response.headers[strHeaderName] The code does not work because each time SmartRequest is initiated, object 'cj' is cleared. How to avoid that? The only stupid solution I figured out is use a global CookieJar object. Is there anyway that could handle all this INSIDE the class? I am totally new to OOP python programming, so could anyone give me some suggestions? Thanks in advance Google for urllib2.HTTPCookieProcessor. HTH, Rob- Hide quoted text - - Show quoted text - Wow, thank you Rob Wolfe! Your reply is shortest yet most helpful! I solved this problem by the following code. class HTTPRefererProcessor(urllib2.BaseHandler): Add Referer header to requests. This only makes sense if you use each RefererProcessor for a single chain of requests only (so, for example, if you use a single HTTPRefererProcessor to fetch a series of URLs extracted from a single page, this will break). There's a proper implementation of this in module mechanize. def __init__(self): self.referer = None def http_request(self, request): if ((self.referer is not None) and not request.has_header(Referer)): request.add_unredirected_header(Referer, self.referer) return request def http_response(self, request, response): self.referer = response.geturl() return response https_request = http_request https_response = http_response def main(): cj = CookieJar() opener = urllib2.build_opener( urllib2.HTTPCookieProcessor(cj), HTTPRefererProcessor(), ) urllib2.install_opener(opener) urllib2.urlopen(url1) urllib2.urlopen(url2) if __main__ == __name__: main() And it's working great! Once again, thanks everyone! How does the class HTTPReferrerProcessor do anything useful for you? -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Feb 24, 4:50�pm, Steven D'Aprano [EMAIL PROTECTED] cybersource.com.au wrote: On Sun, 24 Feb 2008 11:09:32 -0800, Lie wrote: I decided to keep the num/den limit low (10) because higher values might obscure the fact that it do have limits. You do realise that by putting limits on the denominator, you guarantee that the sum of the fractions also has a limit on the denominator? In other words, your test is useless. With denominators limited to 1 through 9 inclusive, the sum will have a denominator of 2*3*5*7 = 210. Th limit will be 2*2*2*3*3*5*7. As MD said, equivalently the product over all primes p = n of the highest power of p not exceeding n. But that limit is a product (literally and figuratively) of your artificial limit on the denominator. Add a fraction with denominator 11, and the sum now has a denominator of 2310; add another fraction n/13 and the sum goes to m/30030; and so on. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: packing things back to regular expression
CL(?Pname1[a-z]+)XY(?:AB)[aeiou]+(?Pname2CD(?Pname3..)\?EF) Good luck. -- Steven This is what I did in the end (in principle). Thanks. A -- http://mail.python.org/mailman/listinfo/python-list
Re: Article of interest: Python pros/cons for the enterprise
In article [EMAIL PROTECTED], Jeff Schwab [EMAIL PROTECTED] wrote: What I would like is not so much a new Python implementation, as a vehicle to help demonstrate a few things to other Python users. Recently, I've had a few replies in tones that imply I'm on the brink of entering several kill-files, mostly because I express disagreement with a few closely held beliefs of some other c.l.p posters. For example, the following are widely held opinions with which I disagree: (1) Python is a gotcha-free language. HAHAHAHAHAHAHA -- please, do provide some evidence for this assertion. (2) C++ is basically the same language as C, but more complicated. Hardly. Again, you need to provide evidence for this assertion. What I would say is that C++ has *all* the gotchas of C plus many of its own. (3) Garbage collection is at least as desirable a language feature as deterministic destruction. Enh. There probably are some people who claim that, but I can't think of any off-hand. However, I suspect that part of the problem is that you don't really understand Python: Python primarily relies on reference counting, which combined with other features in Python makes cycle creation rather easy, and there's no real option other than garbage collection for cleaining up cycles. (4) Static typing is inferior to dynamic typing. There's some truth to what you say, but you are entirely misrepresenting what people actually say: static typing is inferior to unit tests, and dynamic typing requires less boilerplate than static typing and is therefore easier to write. In other ways, though, the Python community is just blindingly ignorant, arrogant, and argumentative. Absolutely. But your blind ignorance and arrogant argumentation isn't helping any. I expect my use of Python to increase in the coming years, so I want the best possible relationship with other regular users, especially on Usenet. Then maybe you should start by learning Python and what people actually say about it. -- Aahz ([EMAIL PROTECTED]) * http://www.pythoncraft.com/ All problems in computer science can be solved by another level of indirection. --Butler Lampson -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
On Feb 24, 4:42�pm, Steven D'Aprano [EMAIL PROTECTED] cybersource.com.au wrote: On Sun, 24 Feb 2008 12:19:53 -0800, Mensanator wrote: Out of curiosity, of what use is denominator limits? The problems where I've had to use rationals have never afforded me such luxury, so I don't see what your point is. It ensures that your fraction's denominator doesn't grow indefinitely, at the cost of some precision. In principle, fraction denominators can grow exponentially. In practice, probably less quickly, but still quickly enough that people on this list have reported that adding two fractions lead to millions of digits in each denominator and massive paging as their computer struggled to perform the addition. Ok, but I've never seen that happen with the rationals of the gmpy module. I'm getting the feeling that this fear of rationals is overrated. But maybe it's because I know what I'm doing. Naw, that can't be it. The beauty of fractions is that they give you infinite precision. The danger of fractions is that it takes a lot of memory to store infinitely precise numbers :) Frankly, I think that for most real-world data, it's unlikely to be a problem, My guess is that you're right. but Guido's experiences with ABC were the opposite. But then we don't know how naive the ABC fraction libraries were. For all I know they did this: 1/2 + 1/2 = 4/4 4/4 - 1/2 = 4/8 4/8 + 1/2 = 16/16 etc. Perhaps Guido should have an occasional peek at the monster he's created. The gmpy library always reduces to lowest denominator, so the above couldn't happen. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a open souce IDE writen by C( C++) or partly writen by C( C++)?
On 2月25日, 上午6时34分, Ricardo Aráoz [EMAIL PROTECTED] wrote: zaley wrote: On Feb 24, 6:48 am, Ricardo Aráoz [EMAIL PROTECTED] wrote: Lie wrote: On Feb 23, 4:02 pm, zaley [EMAIL PROTECTED] wrote: On Feb 22, 11:06 pm, Jesper polluks(#at#)post.tele.dk wrote: Give PyScripter fromhttp://www.mmm-experts.com/atry It is for Windows, though it is written in Delphi and not in C/C++ /Jesper zaley [EMAIL PROTECTED] skrev i en meddelelsenews:[EMAIL PROTECTED] Of course, python scripts debugger On 2ÔÂ22ÈÕ, ÏÂÎç3ʱ22·Ö, zaley [EMAIL PROTECTED] wrote: My project need a simple scripts debugger . I hope I can find something instructive Stefan Behnel дµÀ£º zaley wrote: Is there a open souce IDE writen by C( C++) or partly writen by C( C+ +)? Tons of them. What do you want to do with it? Stefan- Hide quoted text - - Show quoted text - But PyScripter is not a open source project Am I correct to say that the reason why you wanted an open source C++ IDE is because you wanted the freedom to modify your own programming environment? From the About window in PyScripter : A freeware, open source Python scripter integrated development environment created with the ambition to bring to the Python community the quality and functionality available in commercial IDEs available for other languages. So I think we could say PyScripter IS an open source project.- Hide quoted text - - Show quoted text - Really, what I want to do is that scripts can be executed step by step . I know By Py_Runstring clauses in main function can executed by step . But I can't know how to step into a function and how to step in a function. So I hope I can find something helpful in open source IDE for python. Exactly so. PyScripter does it easy, besides you can have in different tabs all the modules of your application. You just hit the run button and your program runs, you hit the debug button and you start going step by step. It's free, easy to install, just give it a try and if you don't like it just trash it. I just want to know how to do it!! -- http://mail.python.org/mailman/listinfo/python-list
Re: How about adding rational fraction to Python?
Mensanator wrote: On Feb 24, 1:09�pm, Lie [EMAIL PROTECTED] wrote: I decided to keep the num/den limit low (10) because higher values might obscure the fact that it do have limits. [ ... ] Out of curiosity, of what use is denominator limits? The problems where I've had to use rationals have never afforded me such luxury, so I don't see what your point is. In calculations dealing only with selected units of measure: dollars and cents, pounds, ounces and tons, teaspoons, gallons, beer bottles 28 to a case, then the denominators would settle out pretty quickly. In general mathematics, not. I think that might be the point. Mel. -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a open souce IDE writen by C( C++) or partly writen by C( C++)?
On 2月25日, 上午6时34分, Ricardo Aráoz [EMAIL PROTECTED] wrote: zaley wrote: On Feb 24, 6:48 am, Ricardo Aráoz [EMAIL PROTECTED] wrote: Lie wrote: On Feb 23, 4:02 pm, zaley [EMAIL PROTECTED] wrote: On Feb 22, 11:06 pm, Jesper polluks(#at#)post.tele.dk wrote: Give PyScripter fromhttp://www.mmm-experts.com/atry It is for Windows, though it is written in Delphi and not in C/C++ /Jesper zaley [EMAIL PROTECTED] skrev i en meddelelsenews:[EMAIL PROTECTED] Of course, python scripts debugger On 2ÔÂ22ÈÕ, ÏÂÎç3ʱ22·Ö, zaley [EMAIL PROTECTED] wrote: My project need a simple scripts debugger . I hope I can find something instructive Stefan Behnel дµÀ£º zaley wrote: Is there a open souce IDE writen by C( C++) or partly writen by C( C+ +)? Tons of them. What do you want to do with it? Stefan- Hide quoted text - - Show quoted text - But PyScripter is not a open source project Am I correct to say that the reason why you wanted an open source C++ IDE is because you wanted the freedom to modify your own programming environment? From the About window in PyScripter : A freeware, open source Python scripter integrated development environment created with the ambition to bring to the Python community the quality and functionality available in commercial IDEs available for other languages. So I think we could say PyScripter IS an open source project.- Hide quoted text - - Show quoted text - Really, what I want to do is that scripts can be executed step by step . I know By Py_Runstring clauses in main function can executed by step . But I can't know how to step into a function and how to step in a function. So I hope I can find something helpful in open source IDE for python. Exactly so. PyScripter does it easy, besides you can have in different tabs all the modules of your application. You just hit the run button and your program runs, you hit the debug button and you start going step by step. It's free, easy to install, just give it a try and if you don't like it just trash it. I just want to know how to realize it in my program !! -- http://mail.python.org/mailman/listinfo/python-list
Re: most loved template engine on python is?
On Feb 25, 1:01 am, Tamer Higazi [EMAIL PROTECTED] wrote: Question: Which is the most loved template engine for python? I am learning MAKO and I think it's good. But can't tell that it's the best as I didn't try others. :) regards, Subeen. http://love-python.blogspot.com/ -- http://mail.python.org/mailman/listinfo/python-list
How to make rainbow RGB values?
Hey all,
I want to map an int to a color on a rainbow spectrum, i.e. for an int
n in the range 0..N, low values (near 0) should map to the red end,
and high values (near N) to the blue/violet end.
The return values should be R, G, B tuples (well, #xx color
codes, but that's not the hard part.)
The trouble I'm having is in coming up with a good way to generate
color values that approximates the ROY G BIV rainbow spectrum. This
is just a simple, non-scientific, non-photographic application,
nothing fancy.
I've tried a simple scheme of overlapping sines, but this resulted in
too much red and blue, and no indigo/violet.
Any suggestions? I'm searching on the web now but not coming up with
much, so I thought I'd ask here.
TIA,
~Simon
Here's the sinecode I tried:
def g(n):
'''
map sine [-1.0 .. 1.0] = color byte [0 .. 255]
'''
return 255 * (n + 1) / 2.0
def f(start, stop, N):
interval = (stop - start) / N
for n in range(N):
coefficient = start + interval * n
yield g(sin(coefficient * pi))
n = 150
RED = f(0.5, 1.5, n)
GREEN = f(1.5, 3.5, n)
BLUE = f(1.5, 2.5, n)
RGBs = [('#%02x%02x%02x' % rgb) for rgb in zip(RED, GREEN, BLUE)]
--
http://mail.python.org/mailman/listinfo/python-list
Re: How to make rainbow RGB values?
I want to map an int to a color on a rainbow spectrum, i.e. for an int n in the range 0..N, low values (near 0) should map to the red end, and high values (near N) to the blue/violet end. [...] I've tried a simple scheme of overlapping sines, but this resulted in too much red and blue, and no indigo/violet. Consider using an HSV-RGB conversion function. Saturation (S) and value (V) should remain constant, while Hue (H) varies to get your rainbow effect. -- Andrew McNamara, Senior Developer, Object Craft http://www.object-craft.com.au/ -- http://mail.python.org/mailman/listinfo/python-list
Create multiple directories
I am somewhat new to Python and I am trying to create a program that automatically creates directories from a range of numbers. I researched the os.mkdir os.makedirs methods, but they do not seem to (I don't know) how to include an argumnet to step through my list. I woudl like to do the follwoing: 1) Ask the user how many folders to create 2) take raw_input and then translate it into a while loop that steps through the os.mkdir process. Any would help would be appreicated. Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Create multiple directories
Paul Lemelle wrote: I am somewhat new to Python and I am trying to create a program that automatically creates directories from a range of numbers. I researched the os.mkdir os.makedirs methods, but they do not seem to (I don't know) how to include an argumnet to step through my list. I woudl like to do the follwoing: 1) Ask the user how many folders to create 2) take raw_input and then translate it into a while loop that steps through the os.mkdir process. Maybe something like this? import os def mkdirs(n): for i in range(n): os.mkdir(%d % i) if __name__ == '__main__': mkdirs(int(raw_input(How many folders should I create? ))) -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a open souce IDE writen by C( C++) or partly writen by C( C++)?
zaley wrote: So I hope I can find something helpful in open source IDE for python. Exactly so. PyScripter does it easy, besides you can have in different tabs all the modules of your application. You just hit the run button and your program runs, you hit the debug button and you start going step by step. It's free, easy to install, just give it a try and if you don't like it just trash it. I just want to know how to do it!! Ok, I hope I'm not misunderstanding you. You go to http://www.mmm-experts.com/Downloads.aspx and you download PyScripter (windows installer). Then you run the downloaded file (that would be PyScripter-setup.exe) and that will install PyScripter in your machine. You run PyScripter, click the open button or menu File/Open... and choose the program you want to debug. It will be opened in an edit window in your PyScripter main window. Then you click on Step into subroutine button or just press F7 and you'll be in the first line of your program. From then on you keep clicking Step into subroutine (F7) or Step over next function call (F8) or Step out of the current subroutine or Run to cursor as you see fit. You can add breakpoints just by clicking to the left of the line numbers or the appropriate button. You can watch what's going on in your program in the lower partition of your main window where you have a Call Stack tab and also Variables, Watches, Breakpoints, Output and Messages tabs. From then on you are on your own. HTH -- http://mail.python.org/mailman/listinfo/python-list
object identity and hashing
Can someone explain this?
a= {}
a[(3,)]= 0
(3,) in a
True
(3,) is (3,)
False
--
http://mail.python.org/mailman/listinfo/python-list
Re: object identity and hashing
[EMAIL PROTECTED] wrote:
Can someone explain this?
a= {}
Create an empty dict and bind it to the name a.
a[(3,)]= 0
Set the key/value pair (3,):0 to the dict.
(3,) in a
Is (3,) one of the keys in the dict?
True
Yes, it is.
(3,) is (3,)
Create two separate tuples (that happen to be equivalent). Are they the
same object?
False
No, they are not.
Every time you write (3,), you are potentially creating a new object.
These objects have equal values (and hash codes), so they are
interchangeable for purposes of keying a dict.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Is there a open souce IDE writen by C( C++) or partly writen by C( C++)?
On 2月25日, 上午10时35分, Ricardo Aráoz [EMAIL PROTECTED] wrote: zaley wrote: So I hope I can find something helpful in open source IDE for python. Exactly so. PyScripter does it easy, besides you can have in different tabs all the modules of your application. You just hit the run button and your program runs, you hit the debug button and you start going step by step. It's free, easy to install, just give it a try and if you don't like it just trash it. I just want to know how to do it!! Ok, I hope I'm not misunderstanding you. You go tohttp://www.mmm-experts.com/Downloads.aspx and you download PyScripter (windows installer). Then you run the downloaded file (that would be PyScripter-setup.exe) and that will install PyScripter in your machine. You run PyScripter, click the open button or menu File/Open... and choose the program you want to debug. It will be opened in an edit window in your PyScripter main window. Then you click on Step into subroutine button or just press F7 and you'll be in the first line of your program. From then on you keep clicking Step into subroutine (F7) or Step over next function call (F8) or Step out of the current subroutine or Run to cursor as you see fit. You can add breakpoints just by clicking to the left of the line numbers or the appropriate button. You can watch what's going on in your program in the lower partition of your main window where you have a Call Stack tab and also Variables, Watches, Breakpoints, Output and Messages tabs. From then on you are on your own. HTH Hehe. You misunderstand me really. I know what you say I just want to know how to realize it using C language or other language. I need such source code to study -- http://mail.python.org/mailman/listinfo/python-list
