New Python Runtime
Came across this article on Ars on a new LLVM (Low Level Virtual Machine) JIT compiler for Python being built by Google: http://arstechnica.com/open-source/news/2009/03/google-launches-project-to-boost-python-performance-by-5x.ars Now the question is will this make Vista run faster? Thought I'd share (If its old news, its new to me) Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Python regex
Andrew Rekdal wrote: I hope posting is ok here for this question... I am attempting to extract the text from a CSS comment using 're' such as... string = /* CSS comment /* exp = [^(/*)].*[^(*/)] p = re.compile(exp) q = p.search(string) r = q.group() print r CSS comment although this works to a degree... I know the within the brackets everything is taken literally so the pattern I am to negating is (/*). ie. includes the parenthesis. So my question is... Is there a way to negate a pattern that is more than on character long? eg. where rather than saying if forward slash OR astrisk appear..negate. I would be saying if parenthesis AND asterisk appear in this order... negate -- Andrew Have you looked into this library: http://cthedot.de/cssutils/ May help you, if you are trying to achieve something. If your doing it as an exercise then I can not help you, I avoid regex like the plague (but thats just me). Hope this helps. Adonis Vargas -- http://mail.python.org/mailman/listinfo/python-list
Re: Why no string return?
gargonx wrote: Say i have the two methods: def ReturnMethod(request, x): if request is True: return x else: print No String for you...False! def SendMethod(request): xstring = Some text ReturnMethod(request, xstring) SendMethod(True) Why does ReturnMethod not return the string x? I do believe it is returning with a NoneType. Any help would be greatly obliged Thanks, Josh That is because request is bound a string (str) object. You are probably testing for null so it should look like: if request: return x else: print No String for you...False! Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: loading dictionary from a file
Amit Gupta wrote:
Need a python trick, if it exists:
I have a file that stores key, value in following format
--
v1 : k1,
v2 : k2
--
Is there a way to directly load this file as dictionary in python. I
could do (foreach line in file, split by : and then do dictionary
insert). Wondering, if some python built-in function can just read a
valid dictionary-file and load it?
Thanks
If you could change the input data you can pickle the dict object then
save and reopen as needed.
import cPickle
data = {'k1': 'v1', 'k2': 'v2'}
output = open('output.dat', 'wb')
cPickle.dump(data, output)
output.close()
data1 = cPickle.load(open('output.dat', 'rb'))
print type(data1)
print data1
Hope this helps.
Adonis Vargas
--
http://mail.python.org/mailman/listinfo/python-list
Re: converting JSON to string
Gowri wrote:
Hello,
I actually have two questions:
1. Are there any libraries which convert XML to JSON?
2. I am currently doing the above using the DOM parser and creating a
JSON array
snippet
for node in doc.getElementsByTagName(book):
isbn = node.getAttribute(isbn)
titleNode = (node.getElementsByTagName(title)
[0]).childNodes[0]
title = titleNode.data
primarykeys.append({'isbn': isbn, 'title': title})
return primarykeys
I want to send primarykeys as a response to my client. i use
mod_python and apache. The problem is, I have not been able to figure
out how to convert my JSON output to a string.
Could someone please help me?
Thanks in advance
do:
return str(primarykeys)
Also there are Python modules for just this. Here is the very first link
from Google:
http://pypi.python.org/pypi/python-json
I have used this one personally and have been very satisfied with it.
There is another one (CJSON?) which is similar, but written in C, for
when performance may be an issue.
Hope this helps.
Adonis
--
http://mail.python.org/mailman/listinfo/python-list
Re: Pygame w/ GUI
PatrickMinnesota wrote: I know this isn't strictly a Python question, but I'm betting some here might be able to give me a hint. I have a few graphical programs doing some 2D data visualization using simple Pygame code for pseudo real-time animation. It's running under windows XP right now, but eventually it'll need to be cross- platform. As it is right now, it probably is, I just haven't tried it anywhere but XP. Now I want to wrap some simple GUI functions around it. I'm looking for some buttons, a text field or two and file system selection of data files. I figure many have done this and there is a better solution than to use Pygame constructs to implement such things. My question: I'm not seeing much support in Pygame for that stuff. It seems I should build buttons and file browsing in some other toolkit. Is that true? Or am I just to early on in the Pygame docs to see solutions? If I should use something else, am I going to be able to use Tkinter or WxPython in conjunction with my Pygame code? Or is there something else I should be looking at? Oh, and I'm running Python 2.5.1 Thanks for any thoughts. I do not have experience using pygame, but you can look at: http://pyui.sourceforge.net/ Creates an user interface with pygame as a possible back end. Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: python from any command line?
waltbrad wrote: Hi folks. I'm learning Python from the Mark Lutz Book, Programming Python 3rd edition. He seems to be able to invoke the Python interpreter from any command line prompt. C:\temppython C:\PP3rdEd\examplespython C:\PP3rdEd\Examples\PP3E\Systemcd Whereas I am only able to invoke it when the command line is pointing to the directory where the executable resides. Currently: C:\Python25 Is there a way to set this so I can also invoke it from any command line prompt? Thankyou very much. The Python executable must be found in your system path, that is why you are unable to just simply type python at anytime at a command prompt. Simple fix: click Start Control Panel System Advanced Environment Variables (bottom right) Then you will have two list boxes one for user environment variables another for system variables. I prefer placing the path in the System environment variables section that way it is available for all accounts on the system (provided you have more than 1 user on it). In the System list locate the Path variables, select edit variable and append ;C:\Python25 to it. And thats it reopen a new command prompt the type python and it should just fire up. Hope this helps. Adonis Vargas -- http://mail.python.org/mailman/listinfo/python-list
Re: searching a value of a dict (each value is a list)
Seongsu Lee wrote:
Hi,
I have a dictionary with million keys. Each value in the
dictionary has a list with up to thousand integers.
Follow is a simple example with 5 keys.
dict = {1: [1, 2, 3, 4, 5],
2: [10, 11, 12],
90: [100, 101, 102, 103, 104, 105],
91: [20, 21, 22],
99: [15, 16, 17, 18, 19]}
I want to find out the key value which has a specific
integer in the list of its value. For example, if I search
104 in the list, 90 must be returned.
How can I do this with Python? Ideas?
You can try this:
items = {1: [1, 2, 3, 4, 5],
2: [10, 11, 12],
90: [100, 101, 102, 103, 104, 105],
91: [20, 21, 22],
99: [15, 16, 17, 18, 19]}
def findItem(item, dictionary):
for key, value in dictionary.iteritems():
if item in value:
print key, value
findItem(104, items)
This will allow you to work with the existing dataset without needing to
duplicate it. It will print all occurrances.
Also, you should never use reserved words like 'dict' this creates
confusion and can cause Python to misbehave since you are rebinding the
name.
Hope this helps.
Adonis Vargas
--
http://mail.python.org/mailman/listinfo/python-list
Re: How can i find a file size on the web ?
Abandoned wrote:
Hi..
Can i find a file size witdhout download?
For example: www.roche.com/rochea_z_sp.pdf
How can i find its size with python ?
I'm sorry for my bad english.
Typically you would just do an HTTP HEAD request in order to get
information about the file without downloading it, but I tested the
given site and it does not seem to support the HEAD request. Instead I
used the GET request and read the headers in which contains information
regarding the file as well, but opted no to read the data to avoid
downloading it.
import httplib
connection = httplib.HTTPConnection(www.roche.com)
connection.request(GET, /rochea_z_sp.pdf)
response = connection.getresponse()
print response.status, response.reason
print File sie: %s % response.getheader('content-length')
Also you can do:
import urllib
response = urllib.urlopen(http://www.roche.com/rochea_z_sp.pdf;)
print response.info()
Hope this helps.
Adonis Vargas
--
http://mail.python.org/mailman/listinfo/python-list
Re: Determine whether program was started by clicking icon or command line
Roger Miller wrote: On Nov 28, 10:51 pm, Benjamin Hell [EMAIL PROTECTED] wrote: Hi! I wonder whether there might be a way to find out how a Python program was started (in my case in Windows): By double clicking the file or by calling it on the DOS command line prompt. Background: I would like to have the program run in an interactive mode if double clicked, and silently in a batch mode when started otherwise. I'm not sure whether this applies to your situation, but often programs started by clicking an icon are run by pythonw, but when started from the command line are run by python. If this is the case sys.stdin.fileno() will return -1 in the former case and 0 in the latter. No, when it gets executed by pythonw the application has an extension of .pyw and .py files are run by the regular python executable. This the default behavior, unless for some odd reason you modified this through the registry or through explorer to do otherwise. Adonis Vargas -- http://mail.python.org/mailman/listinfo/python-list
Re: Async XMLRPC and job processing
Sean Davis wrote: I would like to set up a server that takes XMLRPC requests and processes them asynchronously. The XMLRPC server part is trivial in python. The job processing part is the part that I am having trouble with. I have been looking at how to use threadpool, but I can't see how to get that working. I would like to have the XMLRPC part of things do something like: def method1(a,b,c): jobid=workRequest(long_method1,[a,b,c]) return(jobid) def method2(a,b,c): jobid=workRequest(long_method2,[a,b,c]) return(jobid) def long_method1(a,b,c) do lots of heavy computation, etc. store results in files in a given directory, etc return result for any number of methods Again, pretty straightforward. However, I run into problems with the threadpool and xmlrpc server both waiting. In particular, if I do something like: server = SimpleXMLRPCServer.SimpleXMLRPCServer(.) server.serve_forever() Where can tell the threadpool that I have set up to wait indefinitely? Both are blocking. Thanks, Sean This site shows how to make it multi-threaded: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/425043 But now you have to contend with the integrity of your data, provided your going be storing data through these processes. You may want to look into the Queue module to create a sort of message queue so your data can be properly synchronized. Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: is there some module update(install tools)?
hyena wrote: Hi, I am quite new to python and am looking for some tools that can install and update modules a bit more intelligent then python setup.py install. Is there some thing like yum in fedora which can search and install/update packages automatically? thanks in advance! setuptools is for you http://peak.telecommunity.com/DevCenter/setuptools Once installed, its easy as easy_install module name Hope this helps. Adonis Vargas -- http://mail.python.org/mailman/listinfo/python-list
Re: How to do python and RESTful
MarkyMarc wrote:
Hi all,
I want to make a web service application in python and keywords are
RESTful, python and nice urls(urls mapped to python objects).
I don't want a big framework but a nice small one, that can just do
the things I want.
I have be looking at quixote, but is this uptodate? plain
mod_python, can this make url to http put,get,delete and post?
Can some one here point me some where I can read about python and
RESTful or have some experiences with other?
Any help is apricieted.
Regards Marc
Here is a crude version, if you check out CherryPy there exists a
RESTful module for it floating around. Plus you will get the power or
CherryPy for your apps. I do not have the urls offhand but google should
yeild exactly what you need.
import BaseHTTPServer
class REST(BaseHTTPServer.BaseHTTPRequestHandler):
You can implement and do_* method you want
def do_GET(self):
self.wfile.write(get)
def do_POST(self):
self.wfile.write(post)
def do_PUT(self):
self.wfile.write(put)
def do_DELETE(self):
self.wfile.write(delete)
def main(server_class=BaseHTTPServer.HTTPServer, handler_class=REST):
server_address = ('', 8000)
httpd = server_class(server_address, handler_class)
httpd.serve_forever()
if __name__ == '__main__':
main()
Not fully tested but should get on your feet.
Hope this helps.
Adonis Vargas
--
http://mail.python.org/mailman/listinfo/python-list
Re: Correct abstraction for TK
[EMAIL PROTECTED] wrote: I'm looking for a good example of how to correctly abstract TK code from the rest of my program. I want to just get some user info and then get 4 values from the GUI. Right now I've written it OOP per the examples on python.org but it doesn't seem to be meshing very well with the rest of my project. Can anyone suggest some examples so that I can get more ideas? Thanks, Luke I would not consider this to be 'correct' as many have different philosophies on how to tackle certain projects. My way of doing programming with GUI is writing it in 'tiers' (using this word loosely). i.e. import Tkinter as tk class UsersInfo: pass class Events(UserInfo): pass class GUI(Events): pass This way your GUI class sends events to the Events class to act upon the UserInfo class. For the GUI class here all you do is code the actual display and the callbacks only. Then in the Events class you code the actions you want to happen when you interact the the GUI. Since the GUI class inherits the Events class, in the GUI class you would simply call a method found in the Events class when an event is triggered. Now the Events class which inherits the UserInfo class, you can start using the class to store/modify the user data you desire. Now your code is separated into more comprehensible, and easier to manage sections. In this example I am using inheritance, but if you prefer delegation, then that too can be done here. Also, by doing this it will simplify the moving to more robust graphic toolkits with little modification. Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: How to FTP a ASCII file
[EMAIL PROTECTED] wrote:
Hi,
My program has the following code to transfer a binary file
f = open(pathanme+filename,'rb')
print start transfer
self.fthHandle.storbinary('STOR '+filename, f)
How can I do an ASCII file transfer??
-Ted
Taken from online documentation:
http://docs.python.org/lib/ftp-objects.html
storlines(command, file)
Store a file in ASCII transfer mode. command should be an appropriate
STOR command (see storbinary()). Lines are read until EOF from the
open file object file using its readline() method to provide the data to
be stored.
Hope this helps.
Adonis
--
http://mail.python.org/mailman/listinfo/python-list
Re: ten small Python programs
Steve Howell wrote: I've always thought that the best way to introduce new programmers to Python is to show them small code examples. snip You could try this wiki page: http://rosettacode.org/wiki/Main_Page It has a fair amount of Python examples as well as many more other languages (doing the same algorithm). Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: bitwise shift?
Tobiah wrote: snip Wow, thunderbird displayed this to me as a true exponent, even though it is an ascii message. anyone else get this? Yeah I can confirm Thunderbird 1.5.10 on Linux. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Minimal Linux system to run Python
Chaz Ginger wrote: I have a need for the minimal Linux system to run Python. Basically I want the system to boot up and instead of starting up Init/etc. I would love it to run python (and a python script I have written). Before embarking on doing it myself I was wondering if anyone knew of just such a system? Peace, Chaz You can also look into Linux From Scratch (LFS) http://www.linuxfromscratch.org/ in which walks you through how to build a Linux OS by picking what you need, as well as it may give you more insight on the inner workings of a Linux system. Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Writing files
I am writing a program that walks a directory full of mp3s reads their ID3 data (using Mutagen), this part works perfectly. The problem is I write these tags to a CSV file through the CSV module. But when I read the file the file seems to be incomplete. Further inspecting it has seemed to have stopped writing to the file at a certain point. Something in my code? a bug? System: Linux 2.4.31 (Slackware), Python 2.5c1 Any help is greatly appreciated. Adonis -- code -- def _scan(self): outFile = file(mp3.dat, wb) outCSV = csv.writer(outFile) output = list() for root, dirs, files in os.walk(self.directory): files = [x for x in files if x.endswith(.mp3)] for aFile in sorted(files): mp3Data = MP3(os.path.join(root, aFile)) title = mp3Data.get(TIT2) output.append([root, aFile, title]) outCSV.writerows(output) output = list() -- http://mail.python.org/mailman/listinfo/python-list
Re: Writing files
[EMAIL PROTECTED] wrote: snip -- code -- def _scan(self): outFile = file(mp3.dat, wb) outCSV = csv.writer(outFile) output = list() for root, dirs, files in os.walk(self.directory): files = [x for x in files if x.endswith(.mp3)] for aFile in sorted(files): mp3Data = MP3(os.path.join(root, aFile)) title = mp3Data.get(TIT2) output.append([root, aFile, title]) outCSV.writerows(output) output = list() Are you closing the file before you try to read it? Other than that, I'm drawing a blank with just this sample to work with. Maybe someone else will know...or you could post more code? Mike Actually, I re-ran this in a terminal and it worked perfectly. I was using IDLE to write this code, kinda peculiar. Maybe something to do with IDLE and CSV (or writing to files) with lines ~1000. A socket timing out maybe? Thanks anyways. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: New to Tkinter GUI building
Adam wrote: On Feb 28, 9:13 pm, Adonis Vargas [EMAIL PROTECTED] wrote: Adam wrote: snip I think my main questions are: 1. How can I get the Window to be sized the way I want it? 2. How can I get the Scrollbars to fill the side of the text box instead of being small? (like .pack(fill= tk.Y) snip I have only posted the code relevant to the GUI. TIA Adam To size the window use Tk's geometry method self.top.geometry(%dx%d%+d%+d % (800, 600, 0, 0)) # (width, height, x, y) For the scrollbar to fill vertically, use the sticky grid option. self.scrlr1.grid(row=0, column=1, sticky=tk.N + tk.S) Hope this helps. Adonis Can't test now as its late in th UK and I'm going to bed. Looks good though. So remove the size from the frames etc and use the geometry method instead? Then use grid to pack them for want of a better word? No, the geometry method is used to set the size of your main application window. This is what I understood from your first question, and please correct me if I am wrong. The grid method (or the pack method) are used to layout the widgets. In other words, after line 8 of the code you provided you would add this line: self.top.geometry(%dx%d%+d%+d % (800, 600, 0, 0)) Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: New to Tkinter GUI building
Adam wrote: snip I think my main questions are: 1. How can I get the Window to be sized the way I want it? 2. How can I get the Scrollbars to fill the side of the text box instead of being small? (like .pack(fill= tk.Y) snip I have only posted the code relevant to the GUI. TIA Adam To size the window use Tk's geometry method self.top.geometry(%dx%d%+d%+d % (800, 600, 0, 0)) # (width, height, x, y) For the scrollbar to fill vertically, use the sticky grid option. self.scrlr1.grid(row=0, column=1, sticky=tk.N + tk.S) Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Reg Google Web Toolkit and Python
Shadab Sayani wrote: Hi , We have a project where I need to read files store them in database in the backend.We have done this in python.Now we decided to use Ajax technique for user interface.For that we found that GWT is one of the best toolkits.Now I got a doubt can I interface GWT with python. Thanks , Shadab. Send instant messages to your online friends http://uk.messenger.yahoo.com I have not gone into much detail with GWT (you can look into the Python rendition of GWT called PyJamas), but it should be talking to a web server with the use of XMLHTTPRequest. So this should the case, then you can simply access your resources dynamically. e.g. web server: http://example.com/ resource: http://example.com/someJSONFormattedData An AJAX application with its XMLHTTPRequest it will perform an HTTP GET on /someJSONFormattedData, which depending on your web application server could either be static or dynamic data. Then upon reception of the data, simply parse it and update a section or sections of your AJAX application (unless GWT has mechanisms to handle such things for you). Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Ip address
Scripter47 wrote: How do i get my ip address? in cmd.exe i just type ipconfig then it prints: ... IP-address . . . . . . . . . . . . . . . . . : 192.168.1.10 ... how can i do that in python?? If you want to get your external IP you can do: import urllib checkIP = urllib.urlopen(http://checkip.dyndns.org;).read() externalIP = checkIP.split()[-1].strip(/body/html) print externalIP Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Convert from unicode chars to HTML entities
Steven D'Aprano wrote: I have a string containing Latin-1 characters: s = u© and many more... I want to convert it to HTML entities: result = copy; and many more... Decimal/hex escapes would be acceptable: #169; and many more... #xA9; and many more... I can look up tables of HTML entities on the web (they're a dime a dozen), turn them into a dict mapping character to entity, then convert the string by hand. Is there a batteries included solution that doesn't involve reinventing the wheel? Its *very* ugly, but im pretty sure you can make it look prettier. import htmlentitydefs as entity s = u© and many more... t = for i in s: if ord(i) in entity.codepoint2name: name = entity.codepoint2name.get(ord(i)) entityCode = entity.name2codepoint.get(name) t +=# + str(entityCode) else: t += i print t Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Convert from unicode chars to HTML entities
Adonis Vargas wrote: [...] Its *very* ugly, but im pretty sure you can make it look prettier. import htmlentitydefs as entity s = u© and many more... t = for i in s: if ord(i) in entity.codepoint2name: name = entity.codepoint2name.get(ord(i)) entityCode = entity.name2codepoint.get(name) t +=# + str(entityCode) else: t += i print t Hope this helps. Adonis or import htmlentitydefs as entity s = u© and many more... t = u for i in s: if ord(i) in entity.codepoint2name: name = entity.codepoint2name.get(ord(i)) t += + name + ; else: t += i print t Which I think is what you were looking for. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Best way to document Python code...
Scott Huey wrote: I am working on a Python module and I would like to prepare some API documentaiton. I managed to find epydoc after some searching online. Is there a standard way to document the API for Python modules? Is epydoc the best way to go if there is no standard? Are there other ways to document a Python API? Thanks, Scott Huey The standard is to use docstrings i.e., class MyModule: This module does something def someMethod(self): This method does something, accepts args/returns value etc. Then one way to view the docstrings is to start a python shell, import your module, and do help(MyModule) i.e., module: mymodule.py class: MyModule do in the shell: import mymodule help(mymodule.MyModule) Then Python will generate a quick help interface for your module. I suspect epydoc uses docstrings but I *may* be wrong, since I have never used epydoc. But a quick look at pydoc (not to be confused with epydoc) which is part of the standard library allows you to generate documentation in HTML format, and/or serve it over web with its built-in HTTP server. pydoc: http://docs.python.org/lib/module-pydoc.html Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Starting a child process and getting its stdout?
cypher543 wrote: This has been driving me insane for the last hour or so. I have search everywhere, and nothing works. I am trying to use the subprocess module to run a program and get its output line by line. But, it always waits for the process to terminate and then return the output all at once. Can someone please show me some code that actually works for this sort of thing? It doesn't even have to use the subprocess module. Don't worry if the code isn't compatible with Windows. My program is targeted at Linux/UNIX users. Thanks! try: Python 2.5c1 (r25c1:51305, Aug 17 2006, 17:07:04) [GCC 3.3.6] on linux2 Type help, copyright, credits or license for more information. import subprocess cmd = ls process = subprocess.Popen(cmd, stdout=subprocess.PIPE) print process.stdout.read() For more info on how to do stdin and other things check out: http://docs.python.org/lib/module-subprocess.html Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Confusion with calling function of a subclass
Pyenos wrote: class TREE: def gettree(self):print self TREE.gettree() # I get an error saying # TypeError: unbound method gettree() must be called # with TREE instance as first argument (got nothing instead I still don't understand how to solve this simple code. You first need to create an instance of the class: tree = TREE() tree.gettree() or TREE().gettree() Hope this helps. Adonis P.S. You should look into the tutorial http://docs.python.org/tut/tut.html it will answer a lot of your questions. -- http://mail.python.org/mailman/listinfo/python-list
Re: Simplest way to do Python/Ajax with server and client on same machine?
Kenneth McDonald wrote: I'm doing some work with a Python program that works hand-in-hand with the DOM on a local client (processing DOM events, issuing DOM modification commands, etc.) I'm currently using cherrypy as the Python server for this communication, and simple AJAX on the client browser end. This works just fine, I'm simply wondering if there is a better (even easier) way to do this, if there are libraries I'm not aware of that I should be, etc. Thanks, Ken You can try looking into PyJamas its a Python version of Google Web Toolkit, offers a way to create AJAX apps using Python code. Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: How to reverse tuples in a list?
Noah wrote:
I have a list of tuples
[('a', 1.0), ('b', 2.0), ('c', 3.0)]
I want to reverse the order of the elements inside the tuples.
[(1.0,'a'), (2.0, 'b'), (3.0, 'c')]
I know I could do this long-form:
q = []
y = [('a', 1.0), ('b', 2.0), ('c', 3.0)]
for i in y:
t=list(t)
t.reverse()
q.append(tuple(t))
y = q
But it seems like there should be a clever way to do this with
a list comprehensions. Problem is I can't see how to apply
reverse() to each tuple in the list because reverse() a
list method (not a tuple method) and because it operates
in-place (does not return a value). This kind of wrecks doing
it in a list comprehension. What I'd like to say is something like
this:
y = [t.reverse() for t in y]
Even if reverse worked on tuples, it wouldn't work inside a
list comprehension.
Yours,
Noah
Provided the data remains the same [(a, b), ...]
Python 2.5a2 (r25a2:45740, May 24 2006, 19:50:20)
[GCC 3.3.6] on linux2
x = [('a', 1.0), ('b', 2.0), ('c', 3.0)]
y = [(b, a) for a, b in x]
y
[(1.0, 'a'), (2.0, 'b'), (3.0, 'c')]
Hope this helps,
Adonis
--
http://mail.python.org/mailman/listinfo/python-list
Re: Configuring IDLE on Linux
Satya Kiran wrote: Hello, I have upgraded to Python2.4 on my Red Hat 9.0 Linux box. I want to work with IDLE and ran a search to check it's presence. Here is what I get. [EMAIL PROTECTED] bin]# find / -iname idlelib /usr/local/lib/python2.4/idlelib [EMAIL PROTECTED] bin]# cd /usr/local/lib/python2.4/idlelib [EMAIL PROTECTED] idlelib]# python PyShell.py ** IDLE can't import Tkinter. Your Python may not be configured for Tk. ** How do I resolve this and get IDLE working? thanks in advance, Kiran Satya You must have the Tk libraries present in your system for Python to compile Tkinter. Go to your distribution's site and try to see if they offer a TCL/TK package and install it (being that it is Redhat they most definitely must have one). Then recompile Python. Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: os.isfile() error
Gary Wessle wrote: Hi could someone help me to find out whats wrong with this code? code import os, sys if len(sys.argv) 2: sys.exit(please enter a suitable directory.) dpath = sys.argv[1] for name in os.listdir(dpath): if os.isfile(dpath+name): infile = open(os.path.join(dpath,name), 'rb') print type(infile) error Traceback (most recent call last): File python/useful/cat2all.py, line 13, in ? if os.isfile(dpath+name): AttributeError: 'module' object has no attribute 'isfile' thank you Where 'if os.isfile()' it should be 'os.path.isfile()', the isfile method is not available in the os module, but in os.path. For more information look at the module index: http://docs.python.org/modindex.html Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Gettings subdirectories
Florian Lindner wrote: Hello, how can I get all subdirectories of a given directories? os.listdir() gives me all entries and I've found no way to tell if an object is a file or a directory. Thanks, Florian Here is a quick hack: import os import os.path givenDir = / listing = os.listdir(givenDir) for item in listing: joinPath = os.path.join(givenDir, item) normPath = os.path.normpath(joinPath) if os.path.isdir(normPath): print normPath -- http://mail.python.org/mailman/listinfo/python-list
Re: --version?
Paul Watson wrote: Is there any chance that Python would support the --version command line parameter? It seems that many open source programs use this switch to report their version number. try at a command prompt: python -V Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Locate command in Python
BartlebyScrivener wrote: How about one of these that works on Windows XP? I know there's no files.cache, but I wonder if your script could be combined with another function that would generate a list of paths on a Windows XP machine. Anyway, thanks for the script. I wrote it on a Windows XP machine. The files.cache is generated when you use the -u option. For example if you saved the script as locate.py first at a command prompt: python locate.py -u this will create the files.cache, it simply walks through your entire hard drive writing all the directories and files it finds along the way. Then doing: python locate.py SomeFileOrDirName will go through the files.cache matching whatever term your looking for if present. Although the rootPath variable is set to the POSIX style path of / Python converts it to a proper path. At least thats my assumption as it works fine on my system. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Locate command in Python
mwt wrote:
Is there a function in python that does what locate does in a bash
shell?
I know I could do it by using os.popen('locate'), but I'm curious if
there's a Python native way to go about it. Only needs to work in
Unix, but would be interesting if it was cross-platform.
Thanks.
Here is a quick hack I just did, its very ugly, but does the job.
First do locate -u to create a cache then just locate [term], its not so
fancy as to remind you when the cache is too old, but hey.
It requires Python 2.3+
Hope this helps.
Adonis
---
import os
import sys
rootPath = /
def search(term):
if os.path.exists(files.cache):
cache = file(files.cache, 'r')
for line in cache:
if term in line:
print line.strip()
cache.close()
else:
print Please update the cache
def cache():
cache = file(files.cache, 'w')
for root, dirs, files in os.walk(rootPath):
for aDir in dirs:
cache.write(%s\n % aDir)
for aFile in files:
filePath = os.path.join(root, aFile)
filePath = os.path.normpath(filePath)
cache.write(%s\n % filePath)
cache.close()
if __name__ == __main__:
try:
if sys.argv[1] == -u:
cache()
else:
search(sys.argv[1])
except IndexError:
print Usage: locate [-u] [term]
--
http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter, X-windows and ebay
Bob Greschke wrote: When you post something on eBay (and other places) you can use a 'browse' button on a web page to send a picture file from your hard drive to them for inclusion in your listing. Can the same kind of thing (not the same exact thing, of course) be done with a Python/Tkinter program that is running on a remote machine (that you logged into to start the program), but that's just using your computer's display (with X11 on a Mac, X-whatever on Linux, X-Win32 on Windows, etc.)? I've got an inventory program that runs this way and it would be nice if users could create a text file on their machine, but then have the program read that file and, for example, update item quantities according to information in that file. Things like that. Thanks! Bob This is not a full answer to your question, but an idea, just so happens last few days I have been playing with ssh clients (putty, ssh) X11 Forwarding with success. Essentially the user would run their preferred X, ssh to the server with X11 forwarding enabled to their host address and they can run programs like Xterm or even Nautilus, most X programs and it will be forwarded to their X server over a secured connection. To address the users file system maybe try setting up a file server on the Linux system referring to the users home directory, the user then creates a reference to the file server, then now it may mimic a local feel but all on your Linux server. Now they can run the X app and be able to achieve what you want. I am in no way an expert and some of my ideas might not be 100% accurate, but at my university this is how we have it set and it works perfectly (a very mixed environment as well). Just an idea, hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie ? -- SGML metadata extraction
ProvoWallis wrote:
snip
From what I gather here is a quickie, probably better solutions on the
way but this accomplishes the idea I think.
Some helpful links:
http://docs.python.org/lib/module-sgmllib.html
http://docs.python.org/lib/module-HTMLParser.html
http://docs.python.org/lib/module-htmllib.html
---
from HTMLParser import HTMLParser
data = main-section no=1
form id=graphic_1.tif
form id=graphic_2.tif
main-section no=2
form id=graphic_3.tif
main-section no=3
form id=graphic_4.tif
form id=graphic_5.tif
form id=graphic_6.tif
class ParseForms(HTMLParser):
def handle_starttag(self, tag, attrs):
if tag == form:
# attrs argument is a list of tuples [(attribute, value)]
# converted it to a dictionary to access attribute easier
print form id: %s % dict(attrs).get('id')
if __name__ == __main__:
parser = ParseForms()
parser.feed(data)
--
http://mail.python.org/mailman/listinfo/python-list
Re: Newbie ? -- SGML metadata extraction
ProvoWallis wrote:
Thanks. One more question, though.
I'm not sure how to limit the scope of my search so that I'm just
extracting the id attribute from the sections that I want. I.e., I want
the id attributes from the forms in sections 1 and 3 but not from 2.
Maybe I'm missing something.
If the data has closing tags this is easily achieved using a dom or sax
parser, but here is a slightly modified version, very ugly but simple.
hope this helps.
Adonis
---
from HTMLParser import HTMLParser
data = main-section no=1
form id=graphic_1.tif
form id=graphic_2.tif
main-section no=2
form id=graphic_3.tif
main-section no=3
form id=graphic_4.tif
form id=graphic_5.tif
form id=graphic_6.tif
class ParseForms(HTMLParser):
_section = None
_secDict = dict()
def getSection(self, key):
return self._secDict.get(str(key))
def handle_starttag(self, tag, attrs):
if tag == form:
if not self._secDict.has_key(self._section):
self._secDict[self._section] = [dict(attrs).get('id')]
else:
self._secDict[self._section].append(dict(attrs).get('id'))
if tag == main-section:
self._section = dict(attrs).get('no')
if __name__ == __main__:
parser = ParseForms()
parser.feed(data)
print parser.getSection(1)
print parser.getSection(3)
--
http://mail.python.org/mailman/listinfo/python-list
Re: Detect TKinter window being closed?
Glen wrote: Is it possible to to detect a Tkinter top-level window being closed with the close icon/button (top right), for example to call a function before the window actually closes? Python 2.4 / Linux (2.6 kernel) if that makes any difference. Any info would be greatly appreciated. Thanks Glen Here is an example code taken from: http://www.pythonware.com/library/tkinter/introduction/events-and-bindings.htm (located at very end) Example 7-2. Capturing destroy events # File: protocol1.py from Tkinter import * import tkMessageBox def callback(): if tkMessageBox.askokcancel(Quit, Do you really wish to quit?): root.destroy() root = Tk() root.protocol(WM_DELETE_WINDOW, callback) root.mainloop() Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: about list
Shi Mu wrote: How to run a function to make [1,2,4] become [[1,2],1,4],[2,4]]? Thanks! From what I gather try: a = [1,2,4] n = list() for i in a: index = a.index(i) + 1 for x in a[index:]: n.append([i, x]) print n more elegant ways to do this, but its a start. hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Tkinter PhotoImage Question
I have two classes one class inherits dict(), this class just takes in a path argument much like glob.glob() and loads the image using PhotoImage into itself, no biggie works fine. The other class inherits Frame and it implements an add(self, **kw) method passes all of its arguments to a Button. My question is that when I load the images with the first class and then use dict.get(name) as the image argument for the add method the image does not show up, mind you the variable holding the dict is seen by the whole class so its not a garbage collection issue, but if I put a command in the argument list it works just fine? Any help is greatly appreciated. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Python in the news, somewhat
ZDNet has released this article that talks about open source scriptingg languages and mentions Python/Jython/IronPython, just wanted to share the info. http://news.zdnet.com/2100-9593_22-5705448.html?tag=st.num Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Web Application Client Module
Raffi wrote: Hi All, I hope I'm posting this question to the correct newsgroups. We have a web based database application that's accessed using IE. The application opens a popup window to run in. With all the popup blockers and compromised browsers out there, I'm looking into developing a web based custom client side application to access the application with. The application will be developed to only reach the web application site using the https protocol. It also needs to javascript enabled. It will be downloaded from the main web site and used to access the database application. Any suggestions/ideas on how to go about developing the client application? What tools tools are out there for such a project. Thanks, Raffi This is slightly what I am doing right now, you can use the JavaScript on the browser to (mainly the XMLHttpRequest object) to access servers asynchronously, when accessing the server's resource it returns an XML representation (document) of whatever you want using the browser's builtin DOM you can parse this and using the same DOM you can modify the predefined tags or whatever you want. This approach reduces the traffic to the webserver by only accessing data you need. go to cherrypy.org and right on the start page there should be a link labeled AJAX which is the buzzword being used for this kind of implementation. Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Lowest hassle Python web server?
kanzen wrote: I keep telling my friends that Python rocks. Now it's time to put my money where my mouth is. I'm about to start writing a server for a phone based game. It needs to handle simlpe requests from some Java code running on the phone at a fairly low transaction rate. There will also be a simple web site allowing users to edit preferences and so forth. I have just enough Python experience to decide that I prefer it over Java for this job. It'll be on a Linux box that I have full control over. I can see from FAQs that there are several possible ways of doing web server work in Python, e.g. Twisted or mod_python in Apache, etc. So I'm wondering: - Could you recommend a solution you've found to be the most convenient? - Does threading cause any more of a hassle in Python than Java? - Is there anything similar to JSP in Java? Thanks, KanZen You can look into CherryPy http://www.cherrypy.org/ Hope this helps Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: xmlrpc.server.work() does not seem to handle multiple requests
john14 wrote: Hi, I have an xmlrpc server. I using the python package xmlrpc. Here is what I am doing: s = xmlrpc.server() s.addMethods(method_hash) s.bindAndListen(PORT) while 1: try: s.work() except: e = sys.exc_info() The problem is that when I send multiple requests they are queued and processed one after the other. Is there some other method that will allow me to process multiple request at the same time? Thank You Check out this snippet look at the end for user comments to get a multi-threaded or forking version. http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/81549 Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie: Pythonwin
Brent W. Hughes wrote: 1) I'm running a program within Pythonwin. It's taking too long and I want to stop/kill it. What do I do (other than ctrl-alt-del)? 2) I'm running a long program and I want to minimize it to let it continue to run in the background while I do something else in the foreground. I try clicking on Pythonwin's minimize box but it doesn't respond until the Python program finally quits Then it minimizes! Any way I can do what I want here? Brent Try running your script using (from command prompt): \path\python.exe \path\script.py Alternatively go to its folder in explorer and double click it to run. pythonwin is just a developing enviroment, and the execution of scripts within it is just for debugging use. Hope this helps. Adonis -- http://mail.python.org/mailman/listinfo/python-list
