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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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • Perl vs Python: implementation of algorithms to deal with advanced data structures

    - by user350571
    I'm learning perl and everytime I search for perl stuff in the internet I get some random page with people saying that perl should die because code written in it looks like a lesson in steganography. Then they say that python is clean and stuff like that. Now, I know that those comparisons are always stupid and made by fellows that feel that languages are a extension of their boring personality so, let me ask instead: can you give me the implementation of a widely known algorithm to deal with a data structure like red-black trees in both languages so I can compare?

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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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  • 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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  • 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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  • python: Chess moves validation

    - by Oleg Tarasenko
    Hi, Does anybody know if there is a free python chess moves validation function available somewhere? What I need. I have a diagram stored as a string, and move candidate. What I need is to see if move candidate is valid for the diagram. Would be really interested to see examples, if possible.

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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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  • [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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  • How to test a project with multiple python versions in a sequential way?

    - by ecolell
    I am developing a python adapter to interact with a 3rd party website, without any json or xml api (http://www.class.noaa.gov/). I have a problem when Travis CI run multiple python tests (of the The Travis CI Build Matrix) concurrently. The project is on GitHub at ecolell/noaaclass and the .travis.yml file is: language: python python: - "2.6" - "2.7" - "3.2" - "3.3" install: - "make deploy" script: "make test-coverage-travis-ci" #nosetests after_success: - "make test-coveralls" Specifically, I have a problem when at least 2 python versions were running their unit tests at the same time, because they use the same account of a website. Is there any option to specify to The Build Matrix the execution of each python version in a secuential way? Or maybe, Is there a better way to do this?

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  • why python find not working

    - by user283405
    i am using python 2.5.2. The following code not working. def (self, text, findText): index = text.find(findText) print index Although the findText is present in text, but it still returns None. I have printed the values of text and findText and they are present.

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  • How do I retrieve program output in Python?

    - by Geoff
    I'm not a Perl user, but from this question deduced that it's exceedingly easy to retrieve the standard output of a program executed through a Perl script using something akin to: $version = `java -version`; How would I go about getting the same end result in Python? Does the above line retrieve standard error (equivalent to C++ std::cerr) and standard log (std::clog) output as well? If not, how can I retrieve those output streams as well? Thanks, Geoff

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  • SOAP, Python, suds

    - by iscarface
    Hello everybody! Please advise library for working with soap in python. Now, i'm trying to use "suds". And i can't undestand how get http headers from server reply Code example: from suds.client import Client url = "http://10.1.0.36/money_trans/api3.wsdl" client = Client(url) login_res = client.service.Login("login", "password") variable "login_res" contain xml answer and doesnt contain http headers. But i need to get session id from them. Thank you.

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