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• Converting from a string to boolean in Python?

  - by Joan Venge

  Does anyone know how to do convert from a string to a boolean in Python? I found this link. But it doesn't look like a proper way to do it. I.e. using a built in functionality, etc. EDIT: The reason I asked this is because I learned int("string"), from here. I tried bool ("string") but always got True.

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• When to use Python special methods?

  - by bodacydo

  I know that classes can implement various special methods, such as __iter__, __setitem__, __len__, __setattr__, and many others. But when should I use them? Can anyone describe typical scenarios when I would want to implement them and they would simplify programming in Python? Thanks, Boda Cydo.

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• Cost of exception handlers in Python

  - by Thilo

  In another question, the accepted answer suggested replacing a (very cheap) if statement in Python code with a try/except block to improve performance. Coding style issues aside, and assuming that the exception is never triggered, how much difference does it make (performance-wise) to have an exception handler, versus not having one, versus having a compare-to-zero if-statement?

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• Best deployment strategy for Python google app engine

  - by sushant

  I wonder if there are any best practices/patterns for deploying python apps on Google app engine specifically Django. The best practice should be combination of existing best practices viz. Fabric, Paver, Buildout etc. Also please share best practice patterns for developing (I could not get virtualenv running with Django and Django App engine helper)

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• appscript on OSX 10.6.3 / Python 2.6.1

  - by jldupont

  I am having some trouble getting appscript installed on OS/X 10.6.3 / Python 2.6.1. When I issue sudo easy_install appscript I get "unable to execute gcc-4.2: No such file or directory". Even when I do export CC=/Developer/usr/bin/gcc-4.2 (a valid gcc-4.2 executable), easy_install barks. What could be the issue? Disclaimer: OS/X newbie at the helm...

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• Catching a python app before it exits

  - by Leopd

  I have a python app which is supposed to be very long-lived, but sometimes the process just disappears and I don't know why. Nothing gets logged when this happens, so I'm at a bit of a loss. Is there some way in code I can hook in to an exit event, or some other way to get some of my code to run just before the process quits? I'd like to log the state of memory structures to better understand what's going on.

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• Google Appengine: Java or Python

  - by husayt

  We are going to use Google Appengine platform for our next big web project.But we are not sure which flavour to use: Java or Python. Could you please, advise on cons and pros of each approach? Which is the best way in order to build more scalable and efficient solution quicker. Thanks in advance

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• Which Python module to use for Memcached?

  - by bodacydo

  Hello folks, I am implementing caching for my Python application and I want to use memcached. Which module do you suggest me to use? There are so many that I don't know which one to choose. Thanks, Boda Cydo.

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• Python: unable to inherit from a C extension.

  - by celil

  I am trying to add a few extra methods to a matrix type from the pysparse library. Apart from that I want the new class to behave exactly like the original, so I chose to implement the changes using inheritance. However, when I try from pysparse import spmatrix class ll_mat(spmatrix.ll_mat): pass this results in the following error TypeError: Error when calling the metaclass bases cannot create 'builtin_function_or_method' instances What is this causing this error? Is there a way to use delegation so that my new class behaves exactly the same way as the original?

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• How to Convert DD to DMS in Python

  - by David

  How Do you Convert Decimal Degrees to Degrees Minutes Secands In Python? Is there a Formula already written?

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• Hexadecimals in python

  - by ryudice

  I don't know python and I'm porting a library to C#, I've encountered the following lines of code that is used in some I/O operation but I'm not sure what it is, my guess is that it's a hexadecimal but I don't know why it's inside a string, neither what the backslashes do? sep1 = '\x04H\xfe\x13' # record separator sep2 = '\x00\xdd\x01\x0fT\x02\x00\x00\x01' # record separator

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• Passing options to Python executable in non-interactive mode

  - by chiggsy

  I would like to pass some options to Python (version 2.6) every time, not just in interactive mode. Is there a file I can put such commands in? EDIT: Specifically, I'm wanting to silence the Deprecation warnings.

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• parsing list in python

  - by lakshmipathi

  I have list in python which has following entries name-1 name-2 name-3 name-4 name-1 name-2 name-3 name-4 name-1 name-2 name-3 name-4 I would like remove name-1 from list except its first appearance -- resultant list should look like name-1 name-2 name-3 name-4 name-2 name-3 name-4 name-2 name-3 name-4 How to achieve this ?

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• Can python mechanize handle HTTP auth?

  - by Shekhar

  Mechanize (Python) is failing with 401 for me to open http digest URLs. I googled and tried debugging but no success. My code looks like this. import mechanize project = "test" baseurl = "http://trac.somewhere.net" loginurl = "%s/%s/login" % (baseurl, project) b = mechanize.Browser() b.add_password(baseurl, "user", "secret", "some Realm") b.open(loginurl)

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• Creating Read-only logs with python

  - by Travis

  I am writing a python script that needs to make a log entry whenever it's invoked. The log created by the script must not be changeable by the user (except root) who invoked the script. I tried the syslog module and while this does exactly what I want in terms of file permissions, I need to be able to put the resulting log file in an arbitrary location. How would I go about doing this?

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• pairwise crossproduct in Python?

  - by user248237

  how can I get the list of cross product pairs from a list of arbitrarily long lists in python? e.g. a = [1,2,3] b = [4,5,6] crossproduct(a,b) should yield [[1,4], [1, 5], [1,6], ...] thanks.

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• [Python] TFTP server

  - by www.yegorov-p.ru

  Hello. Are there any modules for python, that can be used as tftp server? I tried Tftpy, but when I try to upload something, it says: ERROR:tftpy:Write requests not implemented at this time. In fact, it's the only function that I need.

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• Silence loggers and printing to screen - Python

  - by RadiantHex

  Hi folks, I'm having a problem with my python script. It's printing massive amounts of data on the screen, and I would like to prevent all sorts of printing to screen. Any ideas? Help would be amazing and very much appreciated!

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• custom format specifications in python

  - by anupam

  hi, in python, how can a custom format-specification be added, to a class ? for example, if i write a matrix class, i would like to define a '%M' (or some such) which would then dump the entire contents of the matrix... thank you kind regards anupam

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• Python regex compile (with re.VERBOSE) not working

  - by bfloriang

  I'm trying to put comments in when compiling a regex but when using the re.VERBOSE flag I get no matchresult anymore. (using Python 3.3.0) Before: regex = re.compile(r"Duke wann", re.IGNORECASE) print(regex.search("He is called: Duke WAnn.").group()) Output: Duke WAnn After: regex = re.compile(r''' Duke # First name Wann #Last Name ''', re.VERBOSE | re.IGNORECASE) print(regex.search("He is called: Duke WAnn.").group())` Output: AttributeError: 'NoneType' object has no attribute 'group'

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• Does Python's shelve module use memory-mapped IO?

  - by Matt Luongo

  Does anyone know if Python's shelve module uses memory-mapped IO? Maybe that question is a bit misleading. I realize that shelve uses an underlying dbm-style module to do its dirty work. What are the chances that the underlying module uses mmap? I'm prototyping a datastore, and while I realize premature optimization is generally frowned upon, this could really help me understand the trade-offs involved in my design.

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• random() in python

  - by Arkapravo

  In python the function random() generates a random float uniformly in the semi-open range [0.0, 1.0). In principle can it ever generate 0.0 (i.e. zero) and 1.0 (i.e. unity)? What is the scenario in practicality?

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• Best way to strip punctuation from a string in Python

  - by Lawrence Johnston

  It seems like there should be a simpler way than: import string s = "string. With. Punctuation?" # Sample string out = s.translate(string.maketrans("",""), string.punctuation) Is there?

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• compare two files in python

  - by noname

  in a.txt i have the text(line one after the other) login;user;name login;user;name1 login;user in b.txt i have the text login;user login;user login;user;name2 after comparing it should display in a text file as login;user;name login;user;name1 login;user;name2.... How can it be done using python?

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• Python XML + Java XML interoperability.

  - by erb

  Hello. I need a recommendation for a pythonic library that can marshall python objects to XML(let it be a file). I need to be able read that XML later on with Java (JAXB) and unmarshall it. I know JAXB has some issues that makes it not play nice with .NET XML libraries so a recommendation on something that actually works would be great.

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