Re: number generator
On Tue, 13 Mar 2007 20:42:17 -0700, [EMAIL PROTECTED] wrote: It should be possible to enumerate all sets of five numbers which sum to 50 and randomly select one of them. Of course it's possible. It's also a very inefficient way of doing so. For five numbers between 1 and 50, there are 50**5 = 312,500,000 possible sets to enumerate. Do you really think it is a good idea to generate over three hundred and twelve million lists, just to return one? The sole advantage of this method is that it will give the most random result, with the least amount of bias possible. But it isn't clear that the much more efficient fence-post method is any less random. See also the Subset Sum Problem: http://en.wikipedia.org/wiki/Subset_sum_problem -- Steven D'Aprano -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Steven D'Aprano [EMAIL PROTECTED] writes: It should be possible to enumerate all sets of five numbers which sum to 50 and randomly select one of them. Of course it's possible. It's also a very inefficient way of doing so. For five numbers between 1 and 50, there are 50**5 = 312,500,000 possible sets to enumerate. No there are only 2611 such sets and generating them takes about 0.5 seconds on my laptop. I posted the code for this elsewhere in the thread. -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Duncan Smith [EMAIL PROTECTED] wrote: Yes, if the generating processes yield numbers from different probability mass functions. You could simply look at the likelihood ratio. Otherwise, the likelihood ratio will be 1. I was thinking about the same random number generator being used in the two disparate ways. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Steven D'Aprano [EMAIL PROTECTED] wrote: Easy-peasey. Just collate the individual numbers from the lists, and graph their frequencies. You will get quite different distributions. Both are random, but in different ways. 8 code - Thanks - I think too complex - was thinking about means and std devs and stuff for each column, and chi squared tests of significance... : - ) - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Gabriel Genellina [EMAIL PROTECTED] wrote: You can't have two different sets with four equal numbers - it's not a very difficult thing, it's impossible to distinguish because they're identical! Given 4 numbers in the set, the 5th is uniquely determined. By example: 12, 3, 10, 18 *must* end with 7. The 5th number is not random. Any randomness analysis should include only the first 4 numbers (or any other set of 4). In other words, there are only 4 degrees of freedom. In the fence analogy, you only have to choose where to place 4 poles; the 5th is fixed at the end. Yes - the requirement of 5 random numbers is in a sense in conflict with the requirement of that add up to 50 - because for the fifth number, given that you have chosen the other 4, you have to get lucky and choose the right one if you are doing it randomly... What my question was about was whether some sort of cluster analysis applied to the results of repeated application of two algorithms would reveal the way in which the numbers were chosen - the first one being choose five numbers, see if they add up to 50, repeat if not, repeat till say 1000 samples generated, and the second being choose four numbers, see if they add to less than 50, repeat if not, else make the fifth the difference between the sum and 50, repeat till 1000 instances generated... Intuitively, the second one will run a LOT faster, all other things being equal, and I was simply wondering if one could tell the difference afterwards - in the first case all the numbers clearly come from the same population, while in the second case four of them do, and the fifth could possibly be from a different population, as it was forced to make up the difference. So I am not so very sure that the set of fifth numbers of the second run would actually be indistinguishable from that of the first. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
On Tue, 13 Mar 2007 23:08:38 -0800, Paul Rubin wrote: Steven D'Aprano [EMAIL PROTECTED] writes: It should be possible to enumerate all sets of five numbers which sum to 50 and randomly select one of them. Of course it's possible. It's also a very inefficient way of doing so. For five numbers between 1 and 50, there are 50**5 = 312,500,000 possible sets to enumerate. No there are only 2611 such sets and generating them takes about 0.5 seconds on my laptop. I posted the code for this elsewhere in the thread. If you generate all the possible sets of five numbers between 1 and 50, there are 50**5 of them, not 2611. Naturally you don't have to store them all, and if you read what I wrote, you'll see I never suggested that you have to store them all. That would be silly. Of course you would use a generator. Now that I've seen your _partition() function, I'm quite impressed. It is still brute-force, but it avoids generating all 50**5 non-unique lists. By my count, it only has to throw away 11,294 lists to generate the 2611 unique lists it returns. And it is quite fast too: approximately 0.12 seconds on my PC. Unfortunately, it doesn't scale. unique_partitions(60, 6) takes 0.8 seconds; unique_partitions(80, 8) takes about 25 seconds; unique_partitions(80, 10) takes about 80 seconds, and unique_partitions(81, 10) takes over 90 seconds. So yes, your partition algorithm does avoid creating the millions of lists which don't sum to 50, and that's a good thing. But it still brute-forces thousands or millions of lists when only one is needed. (E.g. unique_partitions(80, 10) returns 533,975 unique lists. _partitions(80, 10) gives 3,233,568 non-unique lists.) -- Steven D'Aprano -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
On Wed, 14 Mar 2007 19:25:46 +1100, Steven D'Aprano wrote: Now that I've seen your _partition() function, I'm quite impressed. It is still brute-force, but it avoids generating all 50**5 non-unique lists. By my count, it only has to throw away 11,294 lists to generate the 2611 unique lists it returns. Ignore that count. I don't know where I got 11,294 from, the correct figure is 10,358. Oh, I seem to have found a bug in the _partitions() function. I believe it is missing some of the partitions. list(_partitions(25, 24)) [(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2)] list(_partitions(25, 25)) [] -- Steven D'Aprano -- http://mail.python.org/mailman/listinfo/python-list
Mocking OpenOffice in python?
Hi everyone, during our development, we need to write some unit tests that interact with OpenOffice through pyUno. Is there anyone who has got any experience on it? As OpenOffice is quite a large beast, and interaction is rather complex, I would like to know if there is someone who is willing to share experience (and, possibly, code). Ciao PaoloB -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
To make the solutions equi-probable, a simple approach is to recursively enumerate all possibilities and then choose one of them with random.choice(). Since people are posting their solutions now (originally only hints were provided for the homework problem), here's mine: def genpool(n, m): if n == 1: yield [m] else: for i in xrange(1, m): for rest in genpool(n-1, m-i): yield rest + [i] import random print random.choice(list(genpool(n=4, m=20))) -- http://mail.python.org/mailman/listinfo/python-list
Re: How to capture environment state after running a shell script.
On Mar 13, 7:54 pm, [EMAIL PROTECTED] wrote: On Mar 13, 5:57 am, Gerard Flanagan [EMAIL PROTECTED] wrote: Hello, I have a third party shell script which updates multiple environment values, and I want to investigate (and ultimately capture to python) the environment state after the script has run. First close the input so that the (sub) process knows to terminate and flush the output. Then, you can read from the output: import subprocess import popen2 p = subprocess.Popen([/bin/sh], stdin=subprocess.PIPE, stdout=subprocess.PIPE) p.stdin.write(env -i FOO=BAR\n) p.stdin.close() status = p.wait() ret = p.stdout.readlines() p.stdout.close() print ret Perfect! Works a charm. Thanks for helping me out. Gerard -- http://mail.python.org/mailman/listinfo/python-list
Re: using python to visit web sites and print the web sites image to files
On 3月14日, 上午5时44分, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: The reason I want to do simulation but not just crawling is : we have to check many web pages' front page to see whether it conform to our visual standard, e.g, it should put a search box on the top part of the page. It's tedious for human work. So I want to 'crawl and save the visual presentation of the web site automatically', and check these image files later with human eyes. -Xiong Hi Xiong, I have been working on a program to do something very similar to generate thumbnails of websites. The code is in IronPython (which may put you off!) and would need modified or scripted with pywinauto to deal with multiple images. Let me know if it is of use to you and I will upload it. Cheers, Davy Cool, but does it mean that I will need .net to run the code? Xiong -- http://mail.python.org/mailman/listinfo/python-list
Re: how to detect change of list of instances
manstey a écrit : Thanks. All I want to know is whether the newlist, as a list of instances, is modified. I thought equality was the way to go, but is there a simpler way? How can I monitor the state of newlist and set a flag if it is changed in anyway? thinking-out-loud Override the mutators - or just wrap them in a decorator. But I don't know if it's simpler. And FWIW, it won't catch modifications of contained objects - only modifications of the list itself. So you'd also need to wrap contained objects in an object that would itself detect all changes and notify the container. Err... Looks like equality is the way to go. /thinking-out-loud -- http://mail.python.org/mailman/listinfo/python-list
Re: Setting Up SOAPpy for Python v2.5 on Windows?
On 13 Mar 2007 11:53:24 -0700, Steve [EMAIL PROTECTED] wrote: What are the required version of the SOAPpy, PyXML, fpconst that are needed to run under the Python 2.5 environment on Windows? SOAPpy doesn't install under Python 2.5 as-is. You'll need to add source code encodings on all the source files in all the files before setup.py will run. (See PEP 263.). You can get fpconst 0.7.2 from the cheese shop, and PyXML from Sourceforge. I believe the latest versions of these packages work fine. Do be aware, though, that SOAPpy is unmaintained, so you might want to look at other SOAP handling packages like ZSI or elementsoap. Unless, that is, you need functionality that only SOAPpy provides, in which case you are stuck with it. -- Cheers, Simon B [EMAIL PROTECTED] http://www.brunningonline.net/simon/blog/ GTalk: simon.brunning MSN: small_values -- http://mail.python.org/mailman/listinfo/python-list
how to catch system errors in python
Hi, I am using paramiko 1.5.3 with python 2.4 and pycrypto 1.9 I need to know if it is possible to catch sysytem level error, like disk space full or cpu usage indication etc. Any help would be appriciated. Regards, MSK -- http://mail.python.org/mailman/listinfo/python-list
Re: help developing an editor to view openoffice files.
On 14/03/07, Paul Hummer [EMAIL PROTECTED] wrote: I actually just read this in the O'Reilly book Python Cookbook, so I know this answer off the top of my head. OpenOffice files are merely zip files with well documented XML inside. Use the builtin zip module to open them, and then it's just XML parsing. As far as the editor, you'll have to familiarize yourself with the XML data from the documentation, and it sounds like that's quite a project. it is indeed a huge project but I need to get started. I know that it is xml inside a zipped archive. but reading the documents is one thing and rendering them is another. just in case we can convert it to html and then render it in some kind of a html browser or html text area and then when user makes changes to the document, we can save it back to odt. but for that we need both way conversion. Just out of curiosity, why not just download OpenOffice? I wished I could use it out of the box. but the problem is that open office does not provide any accessibility on windows and on linux the work is going on. regards. Krishnakant. -- http://mail.python.org/mailman/listinfo/python-list
Swig Problem string
Hi I have created a simple function called 'addTheString(string str, string appstr)' and the intension is to append the 'appstr' to 'str' and use 'str'. I tried swigging this method. My swigtest.i file is okay as I think I have added both - stl.i at top - std_string.i However, I am running into the problem. I get error messages as follows -- error -- TypeError: argument number 1: a 'std::string' is expected, -- end error -- I tried the mailing list solution posted by Mr. Chiang, but its not helping me. Could you please help me out. Thanks - amitabh -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Steven D'Aprano [EMAIL PROTECTED] wrote: Consider the distance between each paid of consecutive poles. The sum of the distances must add up to the distance from the first to the last, and if there are two fixed poles plus five in between, there are five distances. No there are six distances - the fifth pole has to fit in the same hole as the last fixed one for there to be five. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: Mocking OpenOffice in python?
Hi! Under windows, I drive OOo, from Python, via COM/OLE-automation. It's run OK, but some bugs, in the OOo-COM-Python, had stop my devloppements... However, this way is usable (only on Win, ok?) @-salutations -- Michel Claveau -- http://mail.python.org/mailman/listinfo/python-list
Re: Iterating across a filtered list
Paul Rubin a écrit : Bruno Desthuilliers [EMAIL PROTECTED] writes: (snip) Python has had functions as first class objects and (quite-limited-but) anonymous functions, map(), filter() and reduce() as builtin funcs at least since 1.5.2 (quite some years ago). True, though no iterators so you couldn't easily use those functions on lazily-evaluated streams like you can now. Obviously. But what I meant is that Python may not be *so* historically imperative !-) FWIW, I first learned FP concepts with Python. Iterators like that are a new Python feature List comps are not that new (2.0 or 2.1 ?): print \n.join([contact for name, contact in contacts.items() \ if search.match(name)]) Well you could do it that way but it allocates the entire filtered list in memory. Of course. But then nothing prevents you from using a genexp instead of the list comp - same final result, and the syntax is quite close: print \n.join(contact for name, contact in contacts.items() \ if search.match(name)) So the fact that genexps are still a bit new is not a problem here IMHO - this programming style is not new in Python. It's usually safest to create and consume them in the same place, e.g. creating some sequence and passing it through map, filter, etc. Safest ? Why so ? Just that things can get confusing if you're consuming the iterator in more than one place. Indeed. But that's not what we have here. And FWIW, in programming, lots of things tends to be confusing at first. -- http://mail.python.org/mailman/listinfo/python-list
Re: Iterating across a filtered list
Arnaud Delobelle a écrit : On Mar 13, 8:53 pm, Bruno Desthuilliers [EMAIL PROTECTED] wrote: Paul Rubin a écrit : [snip] Iterators like that are a new Python feature List comps are not that new (2.0 or 2.1 ?): print \n.join([contact for name, contact in contacts.items() \ if search.match(name)]) You can write this, but: * it is difficult to argue that it is more readable than Paul's (or my) 'imperative' version; I personnaly find it more readable. To me, it tells what, not how. * it has no obvious performance benefit, No. and they have some annoying characteristics, like the way they mutate when you touch them. While sequences are iterables, all iterables are not sequences. Know what you use, and you'll be fine. ...And know when to use for statements :) Don't worry, I still use them when appropriate. -- http://mail.python.org/mailman/listinfo/python-list
Re: python/C++ wrapper
- A c++ program receives a 2D-matrix from python as input and gives a 2D-matrix as output back to python. pyogre uses swig ogre is a 3d realtime rendering engine written in c++ so there are many matrix manipulation there and also pyogre does not modify the original code cgkit is a computer graphics toolkit written in c++ for python and it uses boost-python and it uses matrices as well if you want matrix manipulations in python then you may want to look into numpy c api -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
[Alex Martelli] map([random.randrange(5) for i in xrange(45)].count, xrange(5)) i.e., this gives 5 integers (each between 0 and 45 included) summing to 45 -- add 1 to each of them to get the desired result. This is a really nice approach. Besides being fast, it is not too hard to see that it is correct. FWIW, here's a variant with a count using the new defaultdict: n, m = 5, 45 bag = collections.defaultdict(int) for i in xrange(m): bag[random.randrange(n)] += 1 ans = [bag[k] for k in range(n)] -- http://mail.python.org/mailman/listinfo/python-list
Re: python/C++ wrapper
On 14 Mar 2007 02:38:32 -0700, Szabolcs Nagy [EMAIL PROTECTED] wrote: - A c++ program receives a 2D-matrix from python as input and gives a 2D-matrix as output back to python. pyogre uses swig Well, pyogre has few problems with maintenance, and new bindings to Ogre engine was created using Boost.Python( http://www.ogre3d.org/wiki/index.php/PyOgre ) -- Roman Yakovenko C++ Python language binding http://www.language-binding.net/ -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Raymond Hettinger wrote:
Since people are posting their solutions now (originally only hints
were provided for the homework problem), here's mine:
Homework problem? Do you have some information from the OP that I can't
find in this thread? Anyway, I consider the 'homework' idea and the
associated self concept that turns people into -for example-
backstabbing computer scientists who never release their code as the
root of all evil in the educational system. Why should I uphold a moral
code that I don't agree with? To me people posting homework problems are
like refugees which I will help if I can.
def genpool(n, m):
if n == 1:
yield [m]
else:
for i in xrange(1, m):
for rest in genpool(n-1, m-i):
yield rest + [i]
import random
print random.choice(list(genpool(n=4, m=20)))
OK back to the *computer* code. Great function! And it's ideally suited
for memoization too. Too bad this memoizor doesn't accept keyword
arguments, but for the rest it works fine and greatly speeds it up.
import random
def memoize(fn):
cache = {}
def proxy(*args):
try: return cache[args]
except KeyError: return cache.setdefault(args, fn(*args))
return proxy
@memoize
def genpool(n, m):
if n == 1:
yield [m]
else:
for i in xrange(1, m):
for rest in genpool(n-1, m-i):
yield rest + [i]
def test():
print random.choice(list(genpool(5,50)))
if __name__=='__main__':
test()
A.
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Attribute monitoring in a class
Hi list: I have googled quite a bit on this matter and I can't seem to find what I need (I think Im just looking where I'm not suppose to :). I'm working with code that is not of my authorship and there is a class attribute that is changes by directly referencing it (object.attr = value) instead of using a getter/setter (object.setAttr(Value) ) function. The thing is that I have no idea when the change occurs and I would REALLY like to find out. So here comes my question . Is there a function construct inside a python class that is automatically called when an attr is changed Like for example /class Class: def __init__(); self.attr = whatever def __attrChangeFunction__(): print It has changed obj = Class() obj.attr = other whatever *Output:* It has changed / Thanks for the help. Regards/ / -- http://mail.python.org/mailman/listinfo/python-list
Re: python/C++ wrapper
Well, pyogre has few problems with maintenance, and new bindings to Ogre engine was created using Boost.Python( http://www.ogre3d.org/wiki/index.php/PyOgre ) oh last time i played with pyogre they made a transition from boost to swig :) so they are back again at boost (the problem with boost was the slow recompilation time with all the gccxml parsing and a few other problems which maybe got resolved) -- Roman Yakovenko C++ Python language binding http://www.language-binding.net/ thanks for the info this py++ looks promising -- http://mail.python.org/mailman/listinfo/python-list
Re: Attribute monitoring in a class
On 3/14/07, Joel Andres Granados [EMAIL PROTECTED] wrote: I have googled quite a bit on this matter and I can't seem to find what I need (I think Im just looking where I'm not suppose to :). I'm working with code that is not of my authorship and there is a class attribute that is changes by directly referencing it (object.attr = value) instead of using a getter/setter (object.setAttr(Value) ) function. The thing is that I have no idea when the change occurs and I would REALLY like to find out. So here comes my question . Is there a function construct inside a python class that is automatically called when an attr is changed You want __setttr__(). See http://docs.python.org/ref/attribute-access.html. -- Cheers, Simon B [EMAIL PROTECTED] http://www.brunningonline.net/simon/blog/ GTalk: simon.brunning MSN: small_values -- http://mail.python.org/mailman/listinfo/python-list
Passing a FILE* from Python into a MinGW/SWIG module
Hi all I understand that I can't hope to pass a FILE* from the Windows version of Python into a SWIG module that I've built using MinGW gcc/g+ +, because apparently the FILE* structure are different and incompatible. Is there an official workaround for this? Presumably I need to implement a mingw-compatible version of all the 'file' class in Python, eg import mingw import myswigmodule F1 = mingw.file(newfile.txt,rw) F1.write(somestuff) F1.seek(0) F2 = mingw.tmpfile() myswigmodule.dosomething(F1,F2) F2.seek(0) print F2.read() Has anyone done this? Is there a better way that doesn't require users of my module to adapt? Do I have to use the dreaded MSVS to compile my SWIG module? Cheers JP -- http://mail.python.org/mailman/listinfo/python-list
Re: python/C++ wrapper
Check out this example from NumPy. This would be the way sanctioned by the scipy community, as you benefit from a large library of matrix routines that you can use to prepare/postprocess the data. http://www.scipy.org/Cookbook/SWIG_and_NumPy -- http://mail.python.org/mailman/listinfo/python-list
Re: Attribute monitoring in a class
Joel Andres Granados a écrit : Hi list: I have googled quite a bit on this matter and I can't seem to find what I need (I think Im just looking where I'm not suppose to :). I'm working with code that is not of my authorship and there is a class attribute that is changes by directly referencing it (object.attr = value) instead of using a getter/setter (object.setAttr(Value) ) Which is the right thing to do in Python (I mean : *not* using Java-style getters/setters). function. The thing is that I have no idea when the change occurs and I would REALLY like to find out. So here comes my question . Is there a function construct inside a python class that is automatically called when an attr is changed yes : object.__setattr__(self, name, value) # example: class Class(object): def __init__(); self.attr = whatever def __setattr__(self, name, value): object.__setattr__(self, name, value) if name == 'attr': print It has changed # you can also print the call frame, # or set a 'hard' breakpoint here... obj = Class() obj.attr = other whatever *Output:* It has changed Or you might turn attr into a property: class Class(object): def __init__(); self.attr = whatever @apply def attr(): def fset(self, value): self._attr = value print It has changed def fget(self): return self._attr return property(**locals()) But unless you have other needs than simple tracing/debugging, it's probably overkill. HTH -- http://mail.python.org/mailman/listinfo/python-list
Re: Attribute monitoring in a class
Joel Andres Granados a écrit : Hi list: I have googled quite a bit on this matter and I can't seem to find what I need (I think Im just looking where I'm not suppose to :). I'm working with code that is not of my authorship and there is a class attribute that is changes by directly referencing it (object.attr = value) instead of using a getter/setter (object.setAttr(Value) ) function. The thing is that I have no idea when the change occurs and I would REALLY like to find out. So here comes my question . Is there a function construct inside a python class that is automatically called when an attr is changed Like for example /class Class: def __init__(); self.attr = whatever def __attrChangeFunction__(): print It has changed Use a property. Extract from Python 2.3 docs: property( [fget[, fset[, fdel[, doc) Return a property attribute for new-style classes (classes that derive from object). fget is a function for getting an attribute value, likewise fset is a function for setting, and fdel a function for del'ing, an attribute. Typical use is to define a managed attribute x: class C(object): def getx(self): return self.__x def setx(self, value): self.__x = value def delx(self): del self.__x x = property(getx, setx, delx, I'm the 'x' property.) New in version 2.2. obj = Class() obj.attr = other whatever *Output:* It has changed / Thanks for the help. Regards/ / A+ Laurent. -- http://mail.python.org/mailman/listinfo/python-list
Quick Filter Dictionary
Hi,
I have a dictionary which may contain various keys/values, however,
it will always contain 'name' and 'age' keys.
This dictionary is kept inside a class, such as
class Person:
def __init__(self, name, age):
self.data = {'name' : name, 'age' : age}
def getData(self, includeNameAge=False):
if includeNameAge: return self.data
tmp = shallow or deep copy of 'data'
del tmp['name']
del tmp['age']
return tmp
The getdata method should return the data stored for the
person, however, it should be able to return the data excluding the
'name' and 'age'. Any suggestions on how to best implement this?
Keep in mind this sample code is meant to be an example, I realize
that a person would probably always want the name and age returned.
thanks
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Re: Quick Filter Dictionary
On Mar 14, 7:29 am, abcd [EMAIL PROTECTED] wrote:
Hi,
I have a dictionary which may contain various keys/values, however,
it will always contain 'name' and 'age' keys.
This dictionary is kept inside a class, such as
class Person:
def __init__(self, name, age):
self.data = {'name' : name, 'age' : age}
def getData(self, includeNameAge=False):
if includeNameAge: return self.data
tmp = shallow or deep copy of 'data'
del tmp['name']
del tmp['age']
return tmp
The getdata method should return the data stored for the
person, however, it should be able to return the data excluding the
'name' and 'age'. Any suggestions on how to best implement this?
Keep in mind this sample code is meant to be an example, I realize
that a person would probably always want the name and age returned.
thanks
I guess one solution might be
def getData(self, includeNameAge=False):
if includeNameAge: return self.data
return dict(filter(lambda item: item[0] not in ('name', 'age'),
self.data.items()))
any other suggestions, improvements?
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Re: number generator
Since people are posting their solutions now (originally only hints were provided for the homework problem), here's mine: Well, I never really said it was a homework problem. Sure there are more implications to my question that I had first imagined and I'm really happy I could get so many insights but the question did originate from a real problem I was facing in my research. Thanks to everyone for the wonderful thread so far Francesco -- http://mail.python.org/mailman/listinfo/python-list
mod_python demo
Hello all, I have written a web-based voting system (add question, add possible answers to that question, and let users vote) in python. It uses: - mod_python - postgreql (through psycopg2) It includes basic session and user management. It's a very simple system, and the session/user management is highly reusable. The point of writing it was just as a small exercise I made for myself. But now that I'm done with it, I wouldn't mind sharing it with people wanting to get started with mod_python, but wants to have some working code to use as a base (or merely look at for ideas). Is there any Python/web community site anywhere which allows users to upload template code for others to use? Note: I am a Python newbie, so there are probably lots of improvements to be done, if anyone cares enough). -- Kind regards, Jan Danielsson -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem I have with a while loop/boolean/or
Scott David Daniels wrote:
Bart Willems wrote:
...
I always try to stay away from 'negative' operators if possible, to
improve readability:
while True:
hint = raw_input('\nAre you stuck? y/n: ').lower()
if hint = 'y' or hint = 'n':
break
else:
print 'Please answer yes or no'
And if you really want to see what is going wrong, replace that last by:
print 'Please answer yes or no (not %r):' % hint
Better still, use
Please answer y or n
since those are the values you are testing for ...
regards
Steve
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execfile locks file forever if there are any syntax errors - is it python bug?
Hello, When I execfile a file which contains a syntax error, the file becomes locked and stays this way all the way until I exit the interpreter (I am unable to delete it, for example). I have tried but failed to find any way to unlock the file... Is this a bug in Python? Is there *any* way to unlock the file? It is annoying for me because I often execfile various temporary files and it is a nuisance not to be able to delete them. I have tested with Python 2.5 on Windows... do other versions of Python behave this way as well? -- Best wishes, Slawomir Nowaczyk ( [EMAIL PROTECTED] ) I didn't fight my way to the top of the food chain to be a vegetarian. -- http://mail.python.org/mailman/listinfo/python-list
Re: Quick Filter Dictionary
abcd a écrit :
On Mar 14, 7:29 am, abcd [EMAIL PROTECTED] wrote:
Hi,
I have a dictionary which may contain various keys/values, however,
it will always contain 'name' and 'age' keys.
This dictionary is kept inside a class, such as
class Person:
Do yourself a favor : use new-style classes:
class Person(object):
def __init__(self, name, age):
self.data = {'name' : name, 'age' : age}
You may improve this part with kwargs:
def __init__(self, name, age, **kw):
kw.update(name=name, age=age)
self.data = kw
Also, and FWIW, object attributes are stored in self.___dict__. Do you
have a compelling reason to use yet another 'data' dict ?
def getData(self, includeNameAge=False):
if includeNameAge: return self.data
tmp = shallow or deep copy of 'data'
tmp = self.data.copy()
del tmp['name']
del tmp['age']
return tmp
The problem with this implementation (as well as for the other below) is
that in the first case you return a reference to the data dict itself,
while in the second case you return a new dict.
p = Person('bibi', 42, foo='bar')
data = p.getData(True)
data['baaz'] = 'quux'
del data['name']
print p.data
p = Person('bibi', 42, foo='bar')
p.getData()
data['baaz'] = 'quux'
del data['foo']
print p.data
Better to *always* return a copy IMHO.
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Grep Equivalent for Python
Hello all,
I come from a shell/perl background and have just to learn python. To
start with, I'm trying to obtain system information from a Linux
server using the /proc FS. For example, in order to obtain the amount
of physical memory on the server, I would do the following in shell:
grep ^MemTotal /proc/meminfo | awk '{print $2}'
That would get me the exact number that I need. Now, I'm trying to do
this in python. Here is where I have gotten so far:
memFile = open('/proc/meminfo')
for line in memFile.readlines():
print re.search('MemTotal', line)
memFile.close()
I guess what I'm trying to logically do is... read through the file
line by line, grab the pattern I want and assign that to a variable.
The above doesn't really work, it comes back with something like
_sre.SRE_Match object at 0xb7f9d6b0 when a match is found.
Any help with this would be greatly appreciated.
Tom
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Re: Quick Filter Dictionary
abcd wrote:
On Mar 14, 7:29 am, abcd [EMAIL PROTECTED] wrote:
Hi,
I have a dictionary which may contain various keys/values, however,
it will always contain 'name' and 'age' keys.
This dictionary is kept inside a class, such as
class Person:
def __init__(self, name, age):
self.data = {'name' : name, 'age' : age}
def getData(self, includeNameAge=False):
if includeNameAge: return self.data
tmp = shallow or deep copy of 'data'
del tmp['name']
del tmp['age']
return tmp
The getdata method should return the data stored for the
person, however, it should be able to return the data excluding the
'name' and 'age'. Any suggestions on how to best implement this?
Keep in mind this sample code is meant to be an example, I realize
that a person would probably always want the name and age returned.
thanks
I guess one solution might be
def getData(self, includeNameAge=False):
if includeNameAge: return self.data
return dict(filter(lambda item: item[0] not in ('name', 'age'),
self.data.items()))
any other suggestions, improvements?
You might find
return dict((x,y) for (x, y) in self.data.iteritems()
if x not in ('name', 'age'))
easier to understand. Or you might not ...
regards
Steve
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Skype: holdenweb http://del.icio.us/steve.holden
Blog of Note: http://holdenweb.blogspot.com
See you at PyCon? http://us.pycon.org/TX2007
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IronPython and COM Interface
Hello,
I'm new to IronPython and COM so please bear with me.
I have a COM interface provided to me. I need to implement this
interface and pass it to a method as a way of implementing
'callbacks'.
However it appears that the methods of my interface object are never
called.
As a alternative, I implemented the interface in C# and then extended
the C# class in IronPython. However, on running the code, methods of
my C# class rather than the IronPython class are being called.
Can anyone advise? Is this possible in IronPython?
The code is listed below.
Regards,
Divya
---
import time
import clr
clr.AddReference('Interop.MBTCOMLib.dll')
clr.AddReference('Interop.MBTORDERSLib.dll')
clr.AddReference('Interop.MBTQUOTELib.dll')
import MBTCOMLib
import MBTORDERSLib
import MBTQUOTELib
demo_user='user'
demo_pass='pass'
demo_host=9
class MBEvents(MBTQUOTELib.IMbtQuotesNotify):
def __init__(self):
MBTQUOTELib.IMbtQuotesNotify.__init__(self)
def OnLevel2Data(data):
print 'OnLevel2Data'
def OnOptionsData(self, data):
print 'OnOptionsData'
def OnQuoteData(self, data):
print 'OnQuoteData'
def OnTSData(self, data):
print 'OnTSData'
class MB:
def __init__(self):
self.conn = MBTCOMLib.MbtComMgrClass()
#self.conn.EnableSplash(False)
self.orders = self.conn.OrderClient
self.quotes = self.conn.Quotes
self.events = MBEvents()
def login(self, host=demo_host, user=demo_user, passwd=demo_pass):
self.conn.DoLogin(host, user, passwd, '')
print self.quotes.RemoteAddress, self.quotes.RemotePort
self.quotes.AdviseSymbol(self.events, 'EUR/USD', 1|2|3|4)
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Re: Grep Equivalent for Python
tereglow wrote:
Hello all,
I come from a shell/perl background and have just to learn python. To
start with, I'm trying to obtain system information from a Linux
server using the /proc FS. For example, in order to obtain the amount
of physical memory on the server, I would do the following in shell:
grep ^MemTotal /proc/meminfo | awk '{print $2}'
That would get me the exact number that I need. Now, I'm trying to do
this in python. Here is where I have gotten so far:
memFile = open('/proc/meminfo')
for line in memFile.readlines():
print re.search('MemTotal', line)
memFile.close()
I guess what I'm trying to logically do is... read through the file
line by line, grab the pattern I want and assign that to a variable.
The above doesn't really work, it comes back with something like
_sre.SRE_Match object at 0xb7f9d6b0 when a match is found.
Any help with this would be greatly appreciated.
Tom
Regular expressions aren't really needed here. Untested code follows:
for line in open('/proc/meminfo').readlines:
if line.startswith(Memtotal:):
name, amt, unit = line.split()
print name, amt, unit
break
regards
Steve
--
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Holden Web LLC/Ltd http://www.holdenweb.com
Skype: holdenweb http://del.icio.us/steve.holden
Blog of Note: http://holdenweb.blogspot.com
See you at PyCon? http://us.pycon.org/TX2007
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Re: i can`t get python working on the command line (linux)
Mark wrote: and i`ve put it in tel.py (just the same as in the sample) than chmod it to 777 (just to make sure it isn`t a permission issue) and than i run it with: ./tel.py now this is the error that i get: Traceback (most recent call last): File ./tel.py, line 12, in module for line in open(argv[1], 'r').readlines(): IndexError: list index out of range Your Python is installed fine. The problem is that you're accesing argv[1], which would be the first argument after the program in the command line, and you're executing your program without any parameters. All you need to do is read the error message, they help, ;) Try executing your program with something like ./tel.py myfile.txt where, of course, myfile.txt is some file you have around... Regards, -- . Facundo . Blog: http://www.taniquetil.com.ar/plog/ PyAr: http://www.python.org/ar/ -- http://mail.python.org/mailman/listinfo/python-list
logging and wx.Timer
Hi, I read that logging was thread safe ... but can I use it under a GUI timer ? Thanks, hg -- http://mail.python.org/mailman/listinfo/python-list
Re: Attribute monitoring in a class
Bruno Desthuilliers wrote: Joel Andres Granados a écrit : Hi list: I have googled quite a bit on this matter and I can't seem to find what I need (I think Im just looking where I'm not suppose to :). I'm working with code that is not of my authorship and there is a class attribute that is changes by directly referencing it (object.attr = value) instead of using a getter/setter (object.setAttr(Value) ) Which is the right thing to do in Python (I mean : *not* using Java-style getters/setters). function. The thing is that I have no idea when the change occurs and I would REALLY like to find out. So here comes my question . Is there a function construct inside a python class that is automatically called when an attr is changed yes : object.__setattr__(self, name, value) # example: class Class(object): def __init__(); self.attr = whatever def __setattr__(self, name, value): object.__setattr__(self, name, value) if name == 'attr': print It has changed # you can also print the call frame, # or set a 'hard' breakpoint here... obj = Class() obj.attr = other whatever *Output:* It has changed I used this ^^^ one. Thank for the help. Works like a charm. Regards Or you might turn attr into a property: class Class(object): def __init__(); self.attr = whatever @apply def attr(): def fset(self, value): self._attr = value print It has changed def fget(self): return self._attr return property(**locals()) But unless you have other needs than simple tracing/debugging, it's probably overkill. HTH -- http://mail.python.org/mailman/listinfo/python-list
Re: Grep Equivalent for Python
On 14 Mar, 13:37, tereglow [EMAIL PROTECTED] wrote:
Hello all,
I come from a shell/perl background and have just to learn python.
Welcome aboard!
To start with, I'm trying to obtain system information from a Linux
server using the /proc FS. For example, in order to obtain the amount
of physical memory on the server, I would do the following in shell:
grep ^MemTotal /proc/meminfo | awk '{print $2}'
That would get me the exact number that I need. Now, I'm trying to do
this in python. Here is where I have gotten so far:
memFile = open('/proc/meminfo')
for line in memFile.readlines():
print re.search('MemTotal', line)
You could even use the regular expression '^MemTotal' as seen in your
original, or use the match function instead of search. However...
memFile.close()
I guess what I'm trying to logically do is... read through the file
line by line, grab the pattern I want and assign that to a variable.
The above doesn't really work, it comes back with something like
_sre.SRE_Match object at 0xb7f9d6b0 when a match is found.
This is because re.search and re.match (and other things) return match
objects if the regular expression has been found in the provided
string. See this page in the library documentation:
http://docs.python.org/lib/match-objects.html
Any help with this would be greatly appreciated.
The easiest modification to your code is to replace the print
statement with this:
match = re.search('MemTotal', line)
if match is not None:
print match.group()
You can simplify this using various idioms, I imagine, but what you
have to do is to test for a match, then to print the text that
matched. The group method lets you get the whole matching text (if
you don't provide any arguments), or individual groups (applicable
when you start putting groups in your regular expressions).
Paul
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Re: execfile locks file forever if there are any syntax errors - is it python bug?
Slawomir When I execfile a file which contains a syntax error, the file Slawomir becomes locked and stays this way all the way until I exit the Slawomir interpreter (I am unable to delete it, for example). I have Slawomir tried but failed to find any way to unlock the file... Is this Slawomir a bug in Python? Kinda seems like it might be. Please file a bug report on SourceForge. Skip -- http://mail.python.org/mailman/listinfo/python-list
Re: Grep Equivalent for Python
Steve Holden a écrit :
Regular expressions aren't really needed here. Untested code follows:
for line in open('/proc/meminfo').readlines:
for line in open('/proc/meminfo').readlines():
if line.startswith(Memtotal:):
name, amt, unit = line.split()
print name, amt, unit
break
regards
Steve
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Re: Mocking OpenOffice in python?
On Wed, 2007-03-14 at 01:39 -0700, PaoloB wrote: Hi everyone, during our development, we need to write some unit tests that interact with OpenOffice through pyUno. Is there anyone who has got any experience on it? As OpenOffice is quite a large beast, and interaction is rather complex, I would like to know if there is someone who is willing to share experience (and, possibly, code). I have some experience with pyuno, but your question is very open-ended. It would be helpful if you asked specific questions or gave more background on what kind of interaction you're trying to achieve. The generic answer to your request for code examples is that there's a tutorial with example code at http://udk.openoffice.org/python/python-bridge.html, and then there's the API documentation at http://api.openoffice.org/DevelopersGuide/DevelopersGuide.html. -Carsten -- http://mail.python.org/mailman/listinfo/python-list
Re: IronPython and COM Interface
Divya wrote:
Hello,
I'm new to IronPython and COM so please bear with me.
I have a COM interface provided to me. I need to implement this
interface and pass it to a method as a way of implementing
'callbacks'.
However it appears that the methods of my interface object are never
called.
As a alternative, I implemented the interface in C# and then extended
the C# class in IronPython. However, on running the code, methods of
my C# class rather than the IronPython class are being called.
Can anyone advise? Is this possible in IronPython?
The code is listed below.
Regards,
Divya
---
import time
import clr
clr.AddReference('Interop.MBTCOMLib.dll')
clr.AddReference('Interop.MBTORDERSLib.dll')
clr.AddReference('Interop.MBTQUOTELib.dll')
import MBTCOMLib
import MBTORDERSLib
import MBTQUOTELib
demo_user='user'
demo_pass='pass'
demo_host=9
class MBEvents(MBTQUOTELib.IMbtQuotesNotify):
def __init__(self):
MBTQUOTELib.IMbtQuotesNotify.__init__(self)
def OnLevel2Data(data):
print 'OnLevel2Data'
def OnOptionsData(self, data):
print 'OnOptionsData'
def OnQuoteData(self, data):
print 'OnQuoteData'
def OnTSData(self, data):
print 'OnTSData'
class MB:
def __init__(self):
self.conn = MBTCOMLib.MbtComMgrClass()
#self.conn.EnableSplash(False)
self.orders = self.conn.OrderClient
self.quotes = self.conn.Quotes
self.events = MBEvents()
def login(self, host=demo_host, user=demo_user, passwd=demo_pass):
self.conn.DoLogin(host, user, passwd, '')
print self.quotes.RemoteAddress, self.quotes.RemotePort
self.quotes.AdviseSymbol(self.events, 'EUR/USD', 1|2|3|4)
It may not help but I was struggling with the COM-callback issue
yesterday and found that this works in regular python:
import win32com.server.util
def callback:
_public_methods_=['progress']
def progress(self, total, number):
print completed %i of %i % (number, total)
#
# Get instance of callback class
#
cb=callback()
#
# Wrap the callback class to turn it into an IDispatch (COM) object
# so I can pass it to my COM object.
#
idCallback=win32com.server.util.wrap(cb)
#
# Call the COM interface and pass it the callback function
#
r=oC.WSset_callback(idCallback)
In my case the COM object was also written in Python so to get
to the python object I do following:
def WSset_callback(idCallback)
self.callback=win32com.client.Dispatch(idCallback)
Now I can call .progress method of callback class from the COM
object.
self.callback.progress(total, number)
Hope this helps in some way.
-Larry
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Re: Grep Equivalent for Python
I come from a shell/perl background and have just to learn python. To
start with, I'm trying to obtain system information from a Linux
server using the /proc FS. For example, in order to obtain the amount
of physical memory on the server, I would do the following in shell:
grep ^MemTotal /proc/meminfo | awk '{print $2}'
That would get me the exact number that I need. Now, I'm trying to do
this in python. Here is where I have gotten so far:
memFile = open('/proc/meminfo')
for line in memFile.readlines():
print re.search('MemTotal', line)
memFile.close()
import sys
sys.stdout.write(L.split()[1] + '\n' for L in open('/proc/meminfo') if
L.startswith('MemTotal'))
--
mvh Björn
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Re: Mocking OpenOffice in python?
My take was that this is an effort to manipulate these files without the need for Open Office, so I replied as follows: Open Office files (.ods and perhaps .odt) are just zipped or gzipped. Unpack that and then you are dealing with manipulating regular text files--probably HTML. Carsten Haese wrote: On Wed, 2007-03-14 at 01:39 -0700, PaoloB wrote: Hi everyone, during our development, we need to write some unit tests that interact with OpenOffice through pyUno. Is there anyone who has got any experience on it? As OpenOffice is quite a large beast, and interaction is rather complex, I would like to know if there is someone who is willing to share experience (and, possibly, code). I have some experience with pyuno, but your question is very open-ended. It would be helpful if you asked specific questions or gave more background on what kind of interaction you're trying to achieve. The generic answer to your request for code examples is that there's a tutorial with example code at http://udk.openoffice.org/python/python-bridge.html, and then there's the API documentation at http://api.openoffice.org/DevelopersGuide/DevelopersGuide.html. -Carsten -- Shane Geiger IT Director National Council on Economic Education [EMAIL PROTECTED] | 402-438-8958 | http://www.ncee.net Leading the Campaign for Economic and Financial Literacy begin:vcard fn:Shane Geiger n:Geiger;Shane org:National Council on Economic Education (NCEE) adr:Suite 215;;201 N. 8th Street;Lincoln;NE;68508;United States email;internet:[EMAIL PROTECTED] title:IT Director tel;work:402-438-8958 x-mozilla-html:FALSE url:http://www.ncee.net version:2.1 end:vcard -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Duncan Smith wrote: greg wrote: Gabriel Genellina wrote: The 5th number is not random. More precisely, the fifth number is not *independent* of the others. You can't have five independent random numbers that sum to 50; only four independent numbers plus a dependent one. -- Greg In the interests of precision, that should probably read are constrained to sum to 50; it's quite possible to generate a sequence of independent random variates that just happen to sum to 50 (as I'm sure you know). A fairly efficient way of generating random multinomial variates (which would satisfy the OP's problem) [snip] That is, the OP's original problem (without the positivity constraint added in a later post). Duncan -- http://mail.python.org/mailman/listinfo/python-list
Re: Mocking OpenOffice in python?
On 14 Mar, 14:48, Carsten Haese [EMAIL PROTECTED] wrote: On Wed, 2007-03-14 at 01:39 -0700, PaoloB wrote: Hi everyone, during our development, we need to write some unit tests that interact with OpenOffice through pyUno. Is there anyone who has got any experience on it? As OpenOffice is quite a large beast, and interaction is rather complex, I would like to know if there is someone who is willing to share experience (and, possibly, code). I have some experience with pyuno, but your question is very open-ended. It would be helpful if you asked specific questions or gave more background on what kind of interaction you're trying to achieve. The generic answer to your request for code examples is that there's a tutorial with example code athttp://udk.openoffice.org/python/python-bridge.html, and then there's the API documentation athttp://api.openoffice.org/DevelopersGuide/DevelopersGuide.html. -Carsten Hi Carsten, basically, our project (PAFlow) is an application for producing documents in public administrations. We create templates using OpenOffice, that are filled automatically using data from the application itself. Now, interacting with OpenOffice is slow, and our tests get a lot of time to be executed automatically. We are trying to mock OpenOffice, so that we can run our tests without using a true OpenOffice for our tests, except when we express test the filling of data and production of document. Ciao PaoloB -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Raymond Hettinger [EMAIL PROTECTED] wrote: [Alex Martelli] map([random.randrange(5) for i in xrange(45)].count, xrange(5)) i.e., this gives 5 integers (each between 0 and 45 included) summing to 45 -- add 1 to each of them to get the desired result. This is a really nice approach. Besides being fast, it is not too hard to see that it is correct. FWIW, here's a variant with a count using the new defaultdict: n, m = 5, 45 bag = collections.defaultdict(int) for i in xrange(m): bag[random.randrange(n)] += 1 ans = [bag[k] for k in range(n)] Neat -- and you can use 1+bag[k] in the LC to adjust the results if needed, of course. Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: Mocking OpenOffice in python?
On 14 Mar, 14:52, Shane Geiger [EMAIL PROTECTED] wrote: My take was that this is an effort to manipulate these files without the need for Open Office, so I replied as follows: Open Office files (.ods and perhaps .odt) are just zipped or gzipped. Unpack that and then you are dealing with manipulating regular text files--probably HTML. No. What I was trying was to build a fake OpenOffice server, so that we could interact with a fake OpenOffice during our unit test. As OpenOffice is quite slow, this could improve the performance of our unit tests. However, your suggestion is interesting. Ciao PaoloB -- http://mail.python.org/mailman/listinfo/python-list
Re: using python to visit web sites and print the web sites image to files
On Mar 14, 9:02 am, imx [EMAIL PROTECTED] wrote: Cool, but does it mean that I will need .net to run the code? Yep - runtime is free though as is IronPython. For my program the license is BSD. Cheers, Davy -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Hendrik van Rooyen wrote: Duncan Smith [EMAIL PROTECTED] wrote: Yes, if the generating processes yield numbers from different probability mass functions. You could simply look at the likelihood ratio. Otherwise, the likelihood ratio will be 1. I was thinking about the same random number generator being used in the two disparate ways. - Hendrik The code I posted for multinomial variates repeatedly generates independent Poissons until the total is less than, or equal to, the desired total. Then the total is made up by repeatedly sampling from a discrete distribution (multinomial with n==1). If you replace the second stage by just increasing a single count by the necessary amount, then the two mass functions are clearly different. I'm not sure that I'd count this as two approaches using the same random number generator. Duncan -- http://mail.python.org/mailman/listinfo/python-list
RE: Mocking OpenOffice in python?
I currently use Java to generate a 150 page PDF from about 50 .odt files, including replacing occurrances of about 10 place-holder phrases from data in our system. I do not use the OOo database/mailmerge features, just UNO. This process takes about 20 seconds on my 2 year old XP laptop and about 10 seconds on our Linux doc server. So the key problem may be your approach to generating the OO being to slow, rather than needing a way to speed up testing. I use a std java property file/url to define the search/replace pairs and to contol insert of the conditional documents. FWIW the internal .odt is XML once it is unzipped. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of PaoloB Sent: Wednesday, March 14, 2007 9:11 AM To: python-list@python.org Subject: Re: Mocking OpenOffice in python? On 14 Mar, 14:48, Carsten Haese [EMAIL PROTECTED] wrote: On Wed, 2007-03-14 at 01:39 -0700, PaoloB wrote: Hi everyone, during our development, we need to write some unit tests that interact with OpenOffice through pyUno. Is there anyone who has got any experience on it? As OpenOffice is quite a large beast, and interaction is rather complex, I would like to know if there is someone who is willing to share experience (and, possibly, code). I have some experience with pyuno, but your question is very open-ended. It would be helpful if you asked specific questions or gave more background on what kind of interaction you're trying to achieve. The generic answer to your request for code examples is that there's a tutorial with example code athttp://udk.openoffice.org/python/python-bridge.html, and then there's the API documentation athttp://api.openoffice.org/DevelopersGuide/DevelopersGuide.html. -Carsten Hi Carsten, basically, our project (PAFlow) is an application for producing documents in public administrations. We create templates using OpenOffice, that are filled automatically using data from the application itself. Now, interacting with OpenOffice is slow, and our tests get a lot of time to be executed automatically. We are trying to mock OpenOffice, so that we can run our tests without using a true OpenOffice for our tests, except when we express test the filling of data and production of document. Ciao PaoloB -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Questions on migrating from Numeric/Scipy to Numpy
What should I be using to replace Numeric/arrayobject.h: numpy/arrayobject.h or numpy/oldnumeric.h Thanks, VJ -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem I have with a while loop/boolean/or
On Mar 13, 5:34 pm, [EMAIL PROTECTED]
[EMAIL PROTECTED] wrote:
Hi all.
I have a problem with some code :(
---
hint = raw_input(\nAre you stuck? y/n: )
hint = hint.lower()
while (hint != 'n') or (hint != 'y'):
hint = raw_input(Please specify a valid choice: )
I'd even make it a little more bullet-proof by using lower()
while hint.lower() not in ('y','n'):
stuff
That way if the user types in 'Y' on 'N' it will still work. I've
even gone further on occasion
while hint.lower()[0] not in ('y','n'):
stuff
so if they type 'Yes' or 'No' you're still good.
--greg
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Re: most complete xml package for Python?
metaperl wrote: Without even checking them all out, I'm thinking the Amara XML Toolkit must be the most feature-packed. Please check out lxml before you post FUD like this. http://codespeak.net/lxml/ Regards, Stefan -- http://mail.python.org/mailman/listinfo/python-list
dict.items() vs dict.iteritems and similar questions
When is it appropriate to use dict.items() vs dict.iteritems. Both seem to work for something like: for key,val in mydict.items(): print key,val for key,val in mydict.iteritems(): print key,val Also, when is it appropriate to use range() vs xrange(). From my understanding, xrange() essentially gives you an iterator across a range, so it should be used when iterating. Should you only use range() when want to physically store the range as a list? Thanks, Drew -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Raymond: It looks to me as if you are trying to turn a generator into a list in the final line. That doesn't work. Raymond Hettinger wrote: To make the solutions equi-probable, a simple approach is to recursively enumerate all possibilities and then choose one of them with random.choice(). Since people are posting their solutions now (originally only hints were provided for the homework problem), here's mine: def genpool(n, m): if n == 1: yield [m] else: for i in xrange(1, m): for rest in genpool(n-1, m-i): yield rest + [i] import random print random.choice(list(genpool(n=4, m=20))) -- Shane Geiger IT Director National Council on Economic Education [EMAIL PROTECTED] | 402-438-8958 | http://www.ncee.net Leading the Campaign for Economic and Financial Literacy begin:vcard fn:Shane Geiger n:Geiger;Shane org:National Council on Economic Education (NCEE) adr:Suite 215;;201 N. 8th Street;Lincoln;NE;68508;United States email;internet:[EMAIL PROTECTED] title:IT Director tel;work:402-438-8958 x-mozilla-html:FALSE url:http://www.ncee.net version:2.1 end:vcard -- http://mail.python.org/mailman/listinfo/python-list
Re: dict.items() vs dict.iteritems and similar questions
Drew a écrit : When is it appropriate to use dict.items() vs dict.iteritems. Both seem to work for something like: for key,val in mydict.items(): print key,val for key,val in mydict.iteritems(): print key,val Also, when is it appropriate to use range() vs xrange(). From my understanding, xrange() essentially gives you an iterator across a range, so it should be used when iterating. Should you only use range() when want to physically store the range as a list? iteritems and xrange only provide values when requested. items and range build complete list when called. Both work, you may prefer xrange/iteritems for iteration on large collections, you may prefer range/items when processing of the result value explicitly need a list (ex. calculate its length) or when you are going to manipulate the original container in the loop. A+ Laurent. -- http://mail.python.org/mailman/listinfo/python-list
getting user id (from an arbitrary sys user)
hi all. What i need to know is if there is some function like
os.getuid(), but taking an argument (the username, off course), so i can
do getuid('myuser')
Thanks you dudes!
Gerardo
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Re: httplib/socket problems reading 404 Not Found response
On Mar 13, 3:16 pm, Gabriel Genellina [EMAIL PROTECTED] wrote: En Tue, 13 Mar 2007 10:38:24 -0300, Patrick Altman [EMAIL PROTECTED] escribió: Yes, it's a known problem. See this message with a self-response:http://mail.python.org/pipermail/python-list/2006-March/375087.html Are there plans to include this fix in the standard Python libraries or must I make the modifications myself (I'm running Python 2.5)? Submit a bug report, if not already done.http://sourceforge.net/tracker/?group_id=5470 -- Gabriel Genellina Bug already exists at: https://sourceforge.net/tracker/index.php?func=detailaid=1486335group_id=5470atid=105470 In the meantime, I implemented a work around for my specific case in the Amazon S3 library in that I implemented a head() method but am actually just requesting a GET operation with a very small byte range. This is essentially yielding all the same header data that I need (md5 hash in the ETag if the file exists, 404 Not Found if it doesn't). -- http://mail.python.org/mailman/listinfo/python-list
Re: dict.items() vs dict.iteritems and similar questions
On Mar 14, 11:44 am, Laurent Pointal [EMAIL PROTECTED] wrote: Both work, you may prefer xrange/iteritems for iteration on large collections, you may prefer range/items when processing of the result value explicitly need a list (ex. calculate its length) or when you are going to manipulate the original container in the loop. A+ Laurent. Laurent - Extremely helpful, exactly what I was looking for. Thanks, Drew -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Steven D'Aprano [EMAIL PROTECTED] writes: If you generate all the possible sets of five numbers between 1 and 50, there are 50**5 of them, not 2611. Yes, the idea is generate only the sets that add up to 50. unique_partitions(60, 6) takes 0.8 seconds; unique_partitions(80, 8) takes about 25 seconds; unique_partitions(80, 10) takes about 80 seconds, and unique_partitions(81, 10) takes over 90 seconds. Hmm, interesting. Maybe some more optimization is possible. (E.g. unique_partitions(80, 10) returns 533,975 unique lists. _partitions(80, 10) gives 3,233,568 non-unique lists.) Well that's just 6x inflation due to duplicates, so I dunno what else can be done for exhaustive enumeration. Maybe another approach to generating the k'th partition is possible. I'll try to think about this. -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Raymond Hettinger [EMAIL PROTECTED] writes: Since people are posting their solutions now (originally only hints were provided for the homework problem), here's mine: def genpool(n, m): if n == 1: yield [m] else: for i in xrange(1, m): for rest in genpool(n-1, m-i): yield rest + [i] import random print random.choice(list(genpool(n=4, m=20))) This generates a lot of the partitions more than once, with possibly unequal probability. -- http://mail.python.org/mailman/listinfo/python-list
Re: Communicating with a DLL under Linux
Thanks for all the responces, both on and off list. So, I should forget about the DLL, and if I intend to connect the thing to a Linux computer, I'll have to develop the code myself for communicating with it over USB. Fair enough. I might even try that. I've done some surfing since yesterday. Why do I always do that after asking stupid questions in public? It turns out that a Nicolas Sutre has already ported the thing to Linux: http://linuxk8055.free.fr/ Velleman links to his solution from their product page http://www.velleman.be/ot/en/product/view/?id=351346 which might mean something. Nicolas solution is only 250 lines of C code. It #includes a usb.h, so I guess a lot of its functionality is hidden there. It seems structured enough, so I might be able to find some inspiration there. I guess I have some reading to do before I can decide if I shall do this. Anyway, thanks once again for the responces. Not completely in dispair... /MiO -- http://mail.python.org/mailman/listinfo/python-list
Q: Cteni unicode retezcu ze souboru UTF-8 s BOM?
Ahoj všeci,
Tak nějak prakticky poprvé se dostávám k tomu,
jak přečíst unicode řetězce ze souboru, který
je uložen ve formátu UTF-8 se signaturou
na začátku (BOM). Nějak se mi nedaří.
Mám takovýto soubor.txt v UTF-8 s BOM
=
První řádek.
Druhý řádek.
Třetí řádek.
Příšerně žluťoučký kůň úpěl ďábelské ódy.
=
... a pustím skript
=
import codecs
f = codecs.open('soubor.txt', 'r', 'utf-8')
for line in f:
print repr(line)
print line[1:]
f.close()
=
Výsledek vypadá takto
=
C:\tmppython a.py
u'\ufeffPrvn\xed \u0159\xe1dek.\r\n'
První řádek.
u'Druh\xfd \u0159\xe1dek.\r\n'
ruhý řádek.
u'T\u0159et\xed \u0159\xe1dek.\r\n'
řetí řádek.
u'P\u0159\xed\u0161ern\u011b \u017elu\u0165ou\u010dk\xfd k\u016f\u0148
\xfap\u011bl \u010f\xe1belsk\xe9 \xf3dy.\r\n'
říšerně žluťoučký kůň úpěl ďábelské ódy.
=
Všimněte si, že na prvním řádku je \ufeff, což je Byte Order Mark,
který se tam vůbec nemá objevit. Jeví se mi to jako chyba.
Na všech řádcích záměrně nevypisuji printem první znak,
protože u toho prvního řádku to krachne (což je pochopitelné).
Řešil někdo něco podobného? Musí se BOM ukousávat ve vlastní režii?
Díky,
pepr
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Re: Grep Equivalent for Python
In [EMAIL PROTECTED], Laurent Pointal wrote:
Steve Holden a écrit :
Regular expressions aren't really needed here. Untested code follows:
for line in open('/proc/meminfo').readlines:
for line in open('/proc/meminfo').readlines():
for line in open('/proc/meminfo'):
if line.startswith(Memtotal:):
name, amt, unit = line.split()
print name, amt, unit
break
Of course it's cleaner to assign the file object to a name and close the
file explicitly after the loop.
Ciao,
Marc 'BlackJack' Rintsch
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Re: most complete xml package for Python?
On 14 Mar, 16:15, Stefan Behnel [EMAIL PROTECTED] wrote: metaperl wrote: Without even checking them all out, I'm thinking the Amara XML Toolkit must be the most feature-packed. Please check out lxml before you post FUD like this. http://codespeak.net/lxml/ Calm down, Stefan! The inquirer must have got the impression of Amara's superiority from somewhere; all you need to do is to discover which resource gave that impression and balance the situation out. In any case, it's an opinion: there's no fear involved, and the only uncertainty and doubt are in the inquirer's mind, which I suppose is why they posted the inquiry. Paul -- http://mail.python.org/mailman/listinfo/python-list
print and softspace in python
print and softspace in python In python, whenever you use print statement it will append a newline by default. If you don't want newline to be appended, you got use a comma at the end (print 10,) When, you have a list of characters and want them to be printed together a string using a for loop, there was observation that no matter what there was space coming between the characters. No split or join methods helped. list1=['a','b','c'] for e in list1: print e, a b c # Without whitespace it will look like. print abc abc The language reference says that print is designed to output a space before any object. And some search goes to find and that is controlled by softspace attribute of sys.stdout. Way to print without leading space is using sys.stdout.write() import sys for e in list1: sys.stdout.write(e) abc Reference manual says: A space is written before each object is (converted and) written, unless the output system believes it is positioned at the beginning of a line. This is the case (1) when no characters have yet been written to standard output, (2) when the last character written to standard output is \n, or (3) when the last write operation on standard output was not a print statement. (In some cases it may be functional to write an empty string to standard output for this reason.) Question to c.l.p Am Not getting the last part as how you will write a empty string and use print not appending blank space in a single line. Am not getting the (In some cases... ) part of the reference manual section. Please help. -- http://mail.python.org/mailman/listinfo/python-list
Re: Setting Up SOAPpy for Python v2.5 on Windows?
All, Thanks for the suggestions! I think that I will move forward with elementsoap instead of soappy... Steve On Mar 13, 11:53 am, Steve [EMAIL PROTECTED] wrote: Hi All, What are the required version of the SOAPpy, PyXML, fpconst that are needed to run under the Python 2.5 environment on Windows? Locations for the downloads? Thanks! Steve -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Paul Rubin wrote: def genpool(n, m): if n == 1: yield [m] else: for i in xrange(1, m): for rest in genpool(n-1, m-i): yield rest + [i] import random print random.choice(list(genpool(n=4, m=20))) This generates a lot of the partitions more than once, with possibly unequal probability. Well, I just noticed that with my memoization function it produces too little :-( But I hope you notice that this function doesn't create only partitions but all possible outcomes? A. -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Steven D'Aprano [EMAIL PROTECTED] writes: list(_partitions(25, 24)) [(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2)] list(_partitions(25, 25)) [] Hmm. I'll look into this later if I get a chance. Thanks. -- http://mail.python.org/mailman/listinfo/python-list
(beginners) howto ascribe _all_ fields of parent class to child class?
Hi all, I'm rewriting some code from other language to Python; can anyone explain me which way is the simpliest: I have class C1(): def __init__(self): self.a = 5 class C2(C1): def __init__(self): self.b = 8 c = C2() print c.b#prints 8 print c.a#prints error, because field a is absent so how can I wrote the code that I'll got all class C1 fields (not only funcs) Thank you in advance, Dmitrey -- http://mail.python.org/mailman/listinfo/python-list
Re: Grep Equivalent for Python
On Mar 14, 11:57 am, Marc 'BlackJack' Rintsch [EMAIL PROTECTED] wrote:
In [EMAIL PROTECTED], Laurent Pointal wrote:
Steve Holden a écrit :
Regular expressions aren't really needed here. Untested code follows:
for line in open('/proc/meminfo').readlines:
for line in open('/proc/meminfo').readlines():
for line in open('/proc/meminfo'):
if line.startswith(Memtotal:):
name, amt, unit = line.split()
print name, amt, unit
break
Of course it's cleaner to assign the file object to a name and close the
file explicitly after the loop.
Ciao,
Marc 'BlackJack' Rintsch
Thanks all for the help with this, am learning a lot; really
appreciate it.
Tom
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Re: logging and wx.Timer
On Mar 14, 1:52 am, hg [EMAIL PROTECTED] wrote: Hi, I read that logging was thread safe ... but can I use it under a GUI timer ? Thanks, hg That was barely enough information to be worthy of a reply. Need more than that. What do you mean under a gui timer? What gui? What type of usage? More info = more (and better) help. Cheers. JT -- http://mail.python.org/mailman/listinfo/python-list
Re: most complete xml package for Python?
Paul Boddie wrote: On 14 Mar, 16:15, Stefan Behnel [EMAIL PROTECTED] wrote: metaperl wrote: Without even checking them all out, I'm thinking the Amara XML Toolkit must be the most feature-packed. Please check out lxml before you post FUD like this. http://codespeak.net/lxml/ Calm down, Stefan! The inquirer must have got the impression of Amara's superiority from somewhere; all you need to do is to discover which resource gave that impression and balance the situation out. In any case, it's an opinion: there's no fear involved, and the only uncertainty and doubt are in the inquirer's mind, which I suppose is why they posted the inquiry. Although the phrase without even checking them all out hardly lends credence to the OP's assertion of Amara's superiority, and does tend to support a hypothesis involving some ulterior motive (or would if less ingenuously done). regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Blog of Note: http://holdenweb.blogspot.com See you at PyCon? http://us.pycon.org/TX2007 -- http://mail.python.org/mailman/listinfo/python-list
Re: (beginners) howto ascribe _all_ fields of parent class to child class?
dmitrey schrieb: Hi all, I'm rewriting some code from other language to Python; can anyone explain me which way is the simpliest: I have class C1(): def __init__(self): self.a = 5 class C2(C1): def __init__(self): self.b = 8 c = C2() print c.b#prints 8 print c.a#prints error, because field a is absent so how can I wrote the code that I'll got all class C1 fields (not only funcs) You need to call the super classes __init__-method. There are several ways to do so, in your case class C2(C1): def __init__(self): C1.__init__(self) self.b = 8 should do the trick. DIEZ -- http://mail.python.org/mailman/listinfo/python-list
Re: dict.items() vs dict.iteritems and similar questions
# Just by looking at the output, it seems pretty obvious that xrange
would be more memory effcient for large ranges:
print With range():,range(100,200)
print
print With xrange():,xrange(100,200)
d = {1:2,2:3,3:4}
d.items()
d.iteritems()
# I have been curious to use Pysizer (which requires patching Python)
to demonstrate the difference.
Drew wrote:
When is it appropriate to use dict.items() vs dict.iteritems. Both
seem to work for something like:
for key,val in mydict.items():
print key,val
for key,val in mydict.iteritems():
print key,val
Also, when is it appropriate to use range() vs xrange(). From my
understanding, xrange() essentially gives you an iterator across a
range, so it should be used when iterating. Should you only use
range() when want to physically store the range as a list?
Thanks,
Drew
--
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IT Director
National Council on Economic Education
[EMAIL PROTECTED] | 402-438-8958 | http://www.ncee.net
Leading the Campaign for Economic and Financial Literacy
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email;internet:[EMAIL PROTECTED]
title:IT Director
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Re: (beginners) howto ascribe _all_ fields of parent class to child class?
dmitrey wrote: Hi all, I'm rewriting some code from other language to Python; can anyone explain me which way is the simpliest: I have class C1(): def __init__(self): self.a = 5 class C2(C1): def __init__(self): self.b = 8 c = C2() print c.b#prints 8 print c.a#prints error, because field a is absent so how can I wrote the code that I'll got all class C1 fields (not only funcs) Thank you in advance, Dmitrey The only problem here is that your subclass doesn't call the __init__ method of the superclass. Rewrite your C2 definition to read class C2(C1): def __init__(self): C1.__init__(self) self.b = 8 and you should find your example works as you want. regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://del.icio.us/steve.holden Blog of Note: http://holdenweb.blogspot.com See you at PyCon? http://us.pycon.org/TX2007 -- http://mail.python.org/mailman/listinfo/python-list
Python equivalents to MATLAB str2func, func2str, ischar, isfunc?
I can't find these via web serch thank you in advance, Dmitrey -- http://mail.python.org/mailman/listinfo/python-list
Re: Python equivalents to MATLAB str2func, func2str, ischar, isfunc?
dmitrey [EMAIL PROTECTED] writes: I can't find these via web serch thank you in advance, Dmitrey str2func: getattr(some_module, 'f') func2str: f.__name__ ischar: isinstance(x, basestring) and len(x) == 1 isfunc: callable(x) # is most likely to be what you want 'as -- http://mail.python.org/mailman/listinfo/python-list
Re: dict.items() vs dict.iteritems and similar questions
Laurent Pointal wrote: Both work, you may prefer xrange/iteritems for iteration on large collections, you may prefer range/items when processing of the result value explicitly need a list (ex. calculate its length) or when you are going to manipulate the original container in the loop. xrange actually supports len(): len(xrange(10)) 10 -- http://mail.python.org/mailman/listinfo/python-list
Re: number generator
Anton Vredegoor wrote:
def memoize(fn):
cache = {}
def proxy(*args):
try: return cache[args]
except KeyError: return cache.setdefault(args, fn(*args))
return proxy
Sorry this doesn't work in this case. This works:
def memoize(fn):
cache = {}
def proxy(*args):
try: return cache[args]
except KeyError: return cache.setdefault(args, list(fn(*args)))
return proxy
But then we lose all speed advantages from memoizing so
it's no good either.
A.
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Re: Python equivalents to MATLAB str2func, func2str, ischar, isfunc?
dmitrey wrote: I can't find these via web serch You won't find exact equivalents. But, the same functionality is available. Perhaps you would like to show us what you are trying to do in Python. Python's eval has some similarity with str2func Python's repr() or str() has some similarity with func2str ischar(A) is similiar to isinstance(A, str) isfunc is similiar to callable -Travis P.S. (if you are using NumPy, then there are other possibilities as well. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python equivalents to MATLAB str2func, func2str, ischar, isfunc?
Thank you (however in MATLAB ischar is the same as isstr) but what if I don't know the name of module? I.e. I have def myfunc(param): ... #where param can be both funcName or a function, and I want to obtain both name and func, something like if isinstance(param, basestring): func, funcName = something, param else: func, funcName = param, param.__name__ what should I type instead of something? D. On Mar 14, 7:06 pm, Alexander Schmolck [EMAIL PROTECTED] wrote: dmitrey [EMAIL PROTECTED] writes: I can't find these via web serch thank you in advance, Dmitrey str2func: getattr(some_module, 'f') func2str: f.__name__ ischar: isinstance(x, basestring) and len(x) == 1 isfunc: callable(x) # is most likely to be what you want 'as -- http://mail.python.org/mailman/listinfo/python-list
Fwd: Server-side script takes way too long to launch
Thanks Jeff for all the great advice on where to look next, including help with mailman. (I fell off the list and am using this reply to figure out why!) Just switched to gmail and still learning it too. And thanks for being so kind in the code review. Fundamentally, I had too many imported modules in the original code so I partitioned it to run more efficiently. The data from the machine up at school on the subset of code was closer to yours. You have definitely put me back on track. Thanks, Teresa -- Forwarded message -- From: Jeff McNeil [EMAIL PROTECTED] Date: Mar 13, 2007 12:33 PM Subject: Re: Server-side script takes way too long to launch To: Teresa Hardy [EMAIL PROTECTED] Can you send the program? It's hard to try and follow through without... With the additional socket library calls, that could contribute. On 3/13/07, Teresa Hardy [EMAIL PROTECTED] wrote: Josh, someone mentioned mod_python to me and I wasn't sure if it was the right/best solution for accelerating python. I'll chase that one down. Jeff, If I read this right, the browser isn't showing the launched swf for a good 7 seconds on top of the initial latency...some of which is expected. There is something else going on with a socket class running without being called. Restart doesn't seem to help. But the discussion is helping me through some code that might be contributing to the problem. I am going to make some more test runs with a subset of the code. In the meantime there might be something more obvious to an expert in what I am sending. I like to quote Michael Crighton from his Airframes book...it is always a compounding series of events that causes a crash. Any advice greatly appreciated! Access log from Apache... 127.0.0.1 - - [13/Mar/2007:11:33:06 -0700] GET /cgi-bin/finalcode.py?usae HTTP/1.1 200 231 127.0.0.1 - - [13/Mar/2007:11:33:07 -0700] GET /favicon.ico HTTP/1.1 200 3262 192.168.1.51 - - [13/Mar/2007:11:33:17 -0700] GET /choosetemplate.swf HTTP/1.1 200 250695 --- 192.168.1.51 - - [13/Mar/2007:11:33:17 -0700] GET /favicon.ico HTTP/1.1 200 3262 127.0.0.1 - - [13/Mar/2007:11:30:09 -0700] GET /cgi-bin/finalcode.py?usae HTTP/1.1 200 231 127.0.0.1 - - [13/Mar/2007:11:33:21 -0700] GET /cgi-bin/xmlmaker.py?swf1 HTTP/1.1 200 132 My run log inside Python... start Tue Mar 13 11:30:10 2007 Tue Mar 13 11:30:10 2007 inside distractor Tue Mar 13 11:30:10 2007 --- after display1.join Tue Mar 13 11:30:10 2007 Socket in msg init in main program theme before bridge... Tue Mar 13 11:30:10 2007 Connection received from: 192.168.1.51 Socket out msg swf1 Connection terminated Tue Mar 13 11:33:21 2007 in main program theme... swf1 Tue Mar 13 11:33:21 2007 On 3/13/07, Jeff McNeil [EMAIL PROTECTED] wrote: But even if the server was loading Python on each hit, which it will for CGI, it shouldn't take a count to 13, especially on localhost. That to me is an indication of a further problem. Does it take that long to load with each hit, or just the first following a server restart? What do log timestamps say from initial hit until last-byte from your Python script? Might want to validate your Apache configuration and have a look at httpd.apache.org. Sounds to me like DNS lookups are enabled or something of the sort. Thanks, Jeff On 3/13/07, Josh Bloom [EMAIL PROTECTED] wrote: Teresa, when you call a python script this way, the server needs to load the python interpreter for each call. If you need faster execution you should look into having a server process running already. Something like mod_python for apache or CherryPy will help you speed this up. -Josh On 3/13/07, Teresa Hardy [EMAIL PROTECTED] wrote: I have a webpage calling a python script, using Apache serverhttp://localhost/cgi-bin/mycode.py?dmn I am using Firefox, WindowsXP Python 2.4 I can count to 13 from the time I click to the time the browser finds the path. The python runs okay when I finally get to it. In the first step it just launches a Flash file. I benchmarked the time thru the python code and it isn't the slow part. It's the launch. Forgive me if I am not explaining this well. I am pretty much teaching myself...fumbling thru the process. Any suggestions on how to speed up the first step? Thanks, Teresa -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: print and softspace in python
Phoe6 schrieb: print and softspace in python In python, whenever you use print statement it will append a newline by default. If you don't want newline to be appended, you got use a comma at the end (print 10,) When, you have a list of characters and want them to be printed together a string using a for loop, there was observation that no matter what there was space coming between the characters. No split or join methods helped. Huh? x = ['h', 'i', '!'] print ''.join(x) hi! I don't see any problem there. In the most cases you could also build up a string accumulatedly. list1=['a','b','c'] for e in list1: print e, a b c # Without whitespace it will look like. print abc abc The language reference says that print is designed to output a space before any object. And some search goes to find and that is controlled by softspace attribute of sys.stdout. Way to print without leading space is using sys.stdout.write() Note: This attribute is not used to control the print statement, but to allow the implementation of print to keep track of its internal state. import sys for e in list1: sys.stdout.write(e) abc Reference manual says: A space is written before each object is (converted and) written, unless the output system believes it is positioned at the beginning of a line. This is the case (1) when no characters have yet been written to standard output, (2) when the last character written to standard output is \n, or (3) when the last write operation on standard output was not a print statement. (In some cases it may be functional to write an empty string to standard output for this reason.) Question to c.l.p Am Not getting the last part as how you will write a empty string and use print not appending blank space in a single line. I'd guess they think about print ,;print moo (print a blank string, do not skip line, print another one) to preserve the softspace. As far as I get your problem, you don't really have to think about it. Am not getting the (In some cases... ) part of the reference manual section. Please help. Use the join-idiom correctly. HTH, Stargaming -- http://mail.python.org/mailman/listinfo/python-list
Constructor of object
Hello! I want to assign self to object of parent class in constructor, like def my_func(): ... return ParentClass() class MyClass (ParentClass): def __init__(self): self = my_func() but it not work, because object not initialized. What i can do? -- http://mail.python.org/mailman/listinfo/python-list
Re: Grep Equivalent for Python
Okay,
It is now working as follows:
memFile = open('/proc/meminfo')
for line in memFile.readlines():
if line.startswith(MemTotal):
memStr = line.split()
memTotal = memStr[1]
memFile.close()
print Memory: + memTotal + kB
I'm learning the whole try, finally exception stuff so will add that
in as well. Now, I'm trying to figure out the CPU speed. In shell,
I'd do:
grep ^cpu MHz /proc/cpuinfo | awk '{print $4}' | head -1
The head -1 is added because if the server has 2 or more processors,
2 or more lines will result, and I only need data from the first
line. So, now I'm looking for the equivalent to head (or tail in
Python. Is this a case where I'll need to break down and use the re
module? No need to give me the answer, a hint in the right direction
would be great though.
Thanks again,
Tom
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Re: Constructor of object
inline wrote: Hello! I want to assign self to object of parent class in constructor, like def my_func(): ... return ParentClass() class MyClass (ParentClass): def __init__(self): self = my_func() but it not work, because object not initialized. What i can do? You want to override the __new__ function. -- http://mail.python.org/mailman/listinfo/python-list
Re: getting user id (from an arbitrary sys user)
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Gerardo Herzig wrote:
hi all. What i need to know is if there is some function like
os.getuid(), but taking an argument (the username, off course), so i can
do getuid('myuser')
Thanks you dudes!
Gerardo
Please refer http://docs.python.org/lib/module-pwd.html for pwd module.
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http://heaven.branda.to/~thinker/GinGin_CGI.py
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yAJvjodjdL20vU32MVZsLDk=
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Python Oracle
Hi! I need to connect to Oracle. I found this binding, http://www.zope.org/Members/matt/dco2 that is the recommended in the Python page. But that page seems a bit confuse to me. In the upper right corner says that the last release is PreRelease 1, from 2001-11-15. At the bottom, however, it says that 1.3 beta was released 2003-02-10, and is a development version (the last stable is 1.2, from 2002-10-02), four and a half years ago. The question is: is this connector the recommended one? it's aged because it's stable and no more changes are necessary, or it just dead? Works Ok? Thank you!! Regards, -- . Facundo . Blog: http://www.taniquetil.com.ar/plog/ PyAr: http://www.python.org/ar/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Oracle
I would suggest using cx_Oracle as I have had good experience with it. http://www.cxtools.net/default.aspx?nav=cxorlb -Josh On 3/14/07, Facundo Batista [EMAIL PROTECTED] wrote: Hi! I need to connect to Oracle. I found this binding, http://www.zope.org/Members/matt/dco2 that is the recommended in the Python page. But that page seems a bit confuse to me. In the upper right corner says that the last release is PreRelease 1, from 2001-11-15. At the bottom, however, it says that 1.3 beta was released 2003-02-10, and is a development version (the last stable is 1.2, from 2002-10-02), four and a half years ago. The question is: is this connector the recommended one? it's aged because it's stable and no more changes are necessary, or it just dead? Works Ok? Thank you!! Regards, -- . Facundo . Blog: http://www.taniquetil.com.ar/plog/ PyAr: http://www.python.org/ar/ -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Constructor of object
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 inline wrote: Hello! I want to assign self to object of parent class in constructor, like def my_func(): ... return ParentClass() class MyClass (ParentClass): def __init__(self): self = my_func() but it not work, because object not initialized. What i can do? Do you want to call constructor of super-class to initialize the object? If it is true, you have following options. In old style class: class MyClass(ParentClass): def __init__(self): ParentClass.__init__(self) In new style class: class MyClass(ParentClass): def __init__(self): super(MyClass).__init__(self) Or class MyClass(ParentClass): def __init__(self): super(MyClass, self).__init__() - -- Thinker Li - [EMAIL PROTECTED] [EMAIL PROTECTED] http://heaven.branda.to/~thinker/GinGin_CGI.py -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.6 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFF+Dls1LDUVnWfY8gRAvDaAKDVmX8LmuWUdJ4eVil7l//rjCQZLQCg8dO8 Y77CL1ikmtdl6S3HD04GWiA= =mvSe -END PGP SIGNATURE- -- http://mail.python.org/mailman/listinfo/python-list
