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• Do you know any other programming languages that have interactive mode like Python?

  - by systempuntoout

  Python language has a well known feature named interactive mode where interpreter can read commands directly from tty. I tipically use this mode to test if a given module is in the classpath or to play around and test some snippets. Do you know any other programming languages that has Interactive Mode?

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• What's a good pure-python, document-based and flat-file database engine?

  - by joe Simpson

  Hi, for development i'd love to have a flat file database with the requirements up in the title, but I don't seem to be able to find a database with these requirements. I can't seem to get MetaKit to work. I only need it to work on the development machine, but in the real world my product will have more data and needs more room and will need something better. Does anyone know of a database engine capable of this or do I need to just use python's pickle and load and save a file? Joe

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• DeprecationWarning when pushing to Mercurial repo

  - by Josh Nankin

  I'm trying to serve a merurial repository with apache, and when I try to push to the repo I see this in the apache error.log. On the client side I get a 500 error. How do I get this to go away???? [Sun Jun 06 14:43:25 2010] [error] [client 192.168.1.8] /var/lib/python-support/python2.6/mercurial/hgweb/common.py:24: DeprecationWarning: BaseException.message has been deprecated as of Python 2.6 [Sun Jun 06 14:43:25 2010] [error] [client 192.168.1.8] self.message = message [Sun Jun 06 14:43:25 2010] [error] [client 192.168.1.8] /var/lib/python-support/python2.6/mercurial/hgweb/hgweb_mod.py:104: DeprecationWarning: BaseException.message has been deprecated as of Python 2.6 [Sun Jun 06 14:43:25 2010] [error] [client 192.168.1.8] if not inst.message: [Sun Jun 06 14:43:25 2010] [error] [client 192.168.1.8] /var/lib/python-support/python2.6/mercurial/hgweb/hgweb_mod.py:106: DeprecationWarning: BaseException.message has been deprecated as of Python 2.6 [Sun Jun 06 14:43:25 2010] [error] [client 192.168.1.8] return '0\\n%s\\n' % inst.message,

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• How to switch position of two items in a Python list?

  - by mikl

  I haven’t been able to find a good solution for this problem on the net (probably because switch, position, list and Python are all such overloaded words). It’s rather simple – I have this list: ['title', 'email', 'password2', 'password1', 'first_name', 'last_name', 'next', 'newsletter'] I’d like to switch position of 'password2' and 'password1' – not knowing their exact position, only that they’re right next to one another and password2 is first. I’ve accomplished this with some rather long-winded list-subscripting, but I wondered if someone could come up with something a bit more elegant?

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• Why does Python's math.factorial not play nice with threads?

  - by W1N9Zr0

  Why does math.factorial act so weird in a thread? Here is an example, it creates three threads: thread that just sleeps for a while thread that increments an int for a while thread that does math.factorial on a large number. It calls start on the threads, then join with a timeout The sleep and spin threads work as expected and return from start right away, and then sit in the join for the timeout. The factorial thread on the other hand does not return from start until it runs to the end! import sys from threading import Thread from time import sleep, time from math import factorial # Helper class that stores a start time to compare to class timed_thread(Thread): def __init__(self, time_start): Thread.__init__(self) self.time_start = time_start # Thread that just executes sleep() class sleep_thread(timed_thread): def run(self): sleep(15) print "st DONE:\t%f" % (time() - time_start) # Thread that increments a number for a while class spin_thread(timed_thread): def run(self): x = 1 while x < 120000000: x += 1 print "sp DONE:\t%f" % (time() - time_start) # Thread that calls math.factorial with a large number class factorial_thread(timed_thread): def run(self): factorial(50000) print "ft DONE:\t%f" % (time() - time_start) # the tests print print "sleep_thread test" time_start = time() st = sleep_thread(time_start) st.start() print "st.start:\t%f" % (time() - time_start) st.join(2) print "st.join:\t%f" % (time() - time_start) print "sleep alive:\t%r" % st.isAlive() print print "spin_thread test" time_start = time() sp = spin_thread(time_start) sp.start() print "sp.start:\t%f" % (time() - time_start) sp.join(2) print "sp.join:\t%f" % (time() - time_start) print "sp alive:\t%r" % sp.isAlive() print print "factorial_thread test" time_start = time() ft = factorial_thread(time_start) ft.start() print "ft.start:\t%f" % (time() - time_start) ft.join(2) print "ft.join:\t%f" % (time() - time_start) print "ft alive:\t%r" % ft.isAlive() And here is the output on Python 2.6.5 on CentOS x64: sleep_thread test st.start: 0.000675 st.join: 2.006963 sleep alive: True spin_thread test sp.start: 0.000595 sp.join: 2.010066 sp alive: True factorial_thread test ft DONE: 4.475453 ft.start: 4.475589 ft.join: 4.475615 ft alive: False st DONE: 10.994519 sp DONE: 12.054668 I've tried this on python 2.6.5 on CentOS x64, 2.7.2 on Windows x86 and the factorial thread does not return from start on either of them until the thread is done executing. I've also tried this with PyPy 1.8.0 on Windows x86, and there result is slightly different. The start does return immediately, but then the join doesn't time out! sleep_thread test st.start: 0.001000 st.join: 2.001000 sleep alive: True spin_thread test sp.start: 0.000000 sp DONE: 0.197000 sp.join: 0.236000 sp alive: False factorial_thread test ft.start: 0.032000 ft DONE: 9.011000 ft.join: 9.012000 ft alive: False st DONE: 12.763000

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• Is there a way to list all the available drive letters in python?

  - by Electrons_Ahoy

  More or less what it says on the tin: is there an (easy) way in Python to list all the currently in-use drive letters in a windows system? (My google-fu seems to have let me down on this one.) Related: Enumerating all available drive letters in Windows (C++ / Win32)

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• What is the OCaml idiom equivalent to Python's range function?

  - by Pramod

  I want to create a list of integers from 1 to n. I can do this in Python using range(1, n+1), and in Haskell using: take n (iterate (1+) 1). What is the right OCaml idiom for this?

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• How do I set a Jabber status with python-xmpp?

  - by snostorm

  How do I set a GChat or jabber status via python? Right now I've got this: import xmpp new_status = "blah blah blah" login = 'email' pwd = 'password' cnx = xmpp.Client('gmail.com') cnx.connect( server=('talk.google.com',5223) ) cnx.auth(login, pwd, 'botty') pres = xmpp.Presence() pres.setStatus(new_status) cnx.send(pres) It executes, but the status is not updated. I know I'm connecting to the server successfully, as I can send chat messages to others. What am I doing wrong here?

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• Correct way to create a shell like environment in python?

  - by Wilduck

  I'm trying to create a shell like environment, where a user is presented with "" and can type in any of a number of pre-defined commands. However, the only way I can think of implementing this is with a dictionary mapping commands-code and python's "exec". Is there a more correct way of doing this?

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• What's the easiest way of interactively testing long scripts in Python?

  - by Fedor

  I love the IDLE. However, sometimes I have 100-200 line scripts and I want to sort of interactively debug/play with say, functions defined in foo.py instead of just calling python foo.py. Is there a way I can trigger IDLE in the context of my foo.py?

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• How to fix this python error? OverflowError: cannot convert float infinity to integer

  - by aF

  Hello, it gives me this error: Traceback (most recent call last): File "C:\Users\Public\SoundLog\Code\Código Python\SoundLog\Plugins\NoisePlugin.py", line 113, in onPaint dc.DrawLine(valueWI, valueHI, valueWF, valueHF) File "C:\Python26\lib\site-packages\wx-2.8-msw-unicode\wx\_gdi.py", line 3177, in DrawLine return _gdi_.DC_DrawLine(*args, **kwargs) OverflowError: cannot convert float infinity to integer How can I avoid this to happen? Thanks in advance ;)

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• How to generate a mixed-case hash in Python?

  - by pyrony

  I am having a hard time figuring out a reasonable way to generate a mixed-case hash in Python. I want to generate something like: aZeEe9E Right now I'm using MD5, which doesn't generate case-sensitive hashes. What is a good way to generate a hash value consisting of upper- and lower- case characters + numbers?

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• Python 2D list has weird behavor when trying to modify a single value...

  - by Brian

  Hi guys, So I am relatively new to Python and I am having trouble working with 2D Lists. Here's my code: data = [[None]*5]*5 data[0][0] = 'Cell A1' print data and here is the output (formatted for readability): [['Cell A1', None, None, None, None], ['Cell A1', None, None, None, None], ['Cell A1', None, None, None, None], ['Cell A1', None, None, None, None], ['Cell A1', None, None, None, None]] Why does every row get assigned the value?

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• How to create ASCII animation in a console application using Python 3.x?

  - by Hamish Grubijan

  I would like to port this question to Python (Windows + Linux + Mac Os) http://stackoverflow.com/questions/2725529/how-to-create-ascii-animation-in-windows-console-application-using-c Thank you!

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• Is there a static analysis tool for Python, Ruby, Sql, Cobol, Perl, and PL/SQL?

  - by Raj

  I am looking for a static analysis tool for Python, Ruby, Sql, Cobol, Perl, PL/SQL, SQL similar to find bugs and check style. I am looking for calculating the line count, identify bugs during the development, and enforcing coding standard.

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• How can I interact with rather long python scripts?

  - by Fedor

  I love the IDLE. However, sometimes I have 100-200 line scripts and I want to sort of interactively debug/play with say, functions defined in foo.py instead of just calling python foo.py. Is there a way I can trigger IDLE in the context of my foo.py?

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• scripting fruityloops or propellerheads reason from VB or Python?

  - by interstar

  I have both Fruityloops and Propellerheads Reason software synths on my Windows PC. Any way I can get at and script these from either Visual Basic or Python? Or at least send Midi messages to the synths from code? Update : attempts to use something like a "midi-mapper" (thanks for link MusiGenesis) don't seem to work. I don't think Reason or FL Studio act like standard GM Midi synths. Update 2 : If you're interested in this question, check out this too.

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• Does Python/Scipy have a firls( ) replacement (i.e. a weighted, least squares, FIR filter design)?

  - by delicasso

  I am porting code from Matlab to Python and am having trouble finding a replacement for the firls( ) routine. It is used for, least-squares linear-phase Finite Impulse Response (FIR) filter design. I looked at scipy.signal and nothing there looked like it would do the trick. Of course I was able to replace my remez and freqz algorithsm, so that's good. On one blog I found an algorithm that implemented this filter without weighting, but I need one with weights. Thanks, David

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• Can a python webapp be bundled into a single file for deployment?

  - by Phillip Oldham

  Is it possible for a python webapp to be bundled (gzipped?) into a single file, along with any required resources (js/css files) & modules (including modules like lxml which are mostly C-based), for easy deployment?

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• Is it possible to post binaries to usenet with Python?

  - by rnavarro

  Hey All, I'm trying to use the nntplib that comes with python to make some posts to usenet. However I can't figure out how to post binary files using the .post method. I can post plain text files just fine, but not binary files. any ideas?

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• How to detect if 2 news articles have the same topic? (Python language-comparison)

  - by resopollution

  I'm looking for ideas on recommended approach. I'm trying to scrape some headlines and body text from articles for a few specific sites, similar to what Google does with Google News. The problem is across different sites, they may have articles on the same exact subject, worded slightly differently. Can anyone point to me what I need to know in order to write a comparison algorithm to auto-detect similar articles? Thanks very much in advance. I use Python.

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• How do I setup a Python development environment on Linux ?

  - by Rob Sobers

  I'm a .NET developer who knows very little about Python, but want to give it a test drive for a small project I'm working on. What tools and packages should I install on my machine? I'm looking for a common, somewhat comprehensive, development environment. I'll likely run Ubuntu 9.10, but I'm flexible. If Windows is a better option, that's fine too.

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• Is there a way to make python become interactive in the middle of a script?

  - by static_rtti

  I'd like to do something like: do lots of stuff to prepare a good environement become_interactive #wait for Ctrl-D automatically clean up Is it possible with python?If not, do you see another way of doing the same thing?

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• Python - is there a "don't care" symbol for tuple assignments?

  - by Cristi Diaconescu

  Given a string "VAR=value" I want to split it at the first '=' sign, something like this: var, sep, value = "VAR=value".partition('=') Is there a way to NOT declare a variable 'sep'? Like this (just made up the syntax): var, -, value = "VAR=value".partition('=') Just for completeness, I'm targetting Python v 2.6

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• How to send a EML file as email using python script to list of emails one at a time?

  - by affan

  I want to write a simple python script that send a EML file exported from Outlook though given smtp server as email to a given list of emails. I know how to send a simple email but sending a EML file as email is not something i could do and could not find it on Google. Can anyone help me with that. The EML file is actually in HTML format with embedded images. Any alternate suggestion is also welcome.

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