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• Google app engine How to count SUM from datestore?

  - by Alon

  Hey, Im wondering, how can i get a SUM of a rating entity i get from the datastore (python)? should i: ratingsum = 0 for rating in ratings: ratingsum + rating print ratingsum ?

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• What is wrong with this SimPy installation?

  - by dmindreader

  Alright, I have tried a bunch of times the python setup.py install command from my command prompt, and this is what I'm getting: SCREEN And when trying this: from SimPy.Simulation import * on Idle, I get this: Traceback (most recent call last): File "C:/Python30/pruebas/prueba1", line 1, in <module> from SimPy.Simulation import * File "C:\Python30\SimPy\Simulation.py", line 320 print 'SimPy.Simulation %s' %__version__, ^ SyntaxError: invalid syntax >>>

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• Can't import pygame to Netbeans on Mac

  - by Hollgam

  I am running python 2.6.5 and pygame 1.9.1 It seems to me I've tried everything but it keeps showing 'module not found' errors... Please help!

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• how to load data and store the data from a file using numpy

  - by Charlie Epps

  I have the following file like this: 2 qid:1 1:0.32 2:0.50 3:0.78 4:0.02 10:0.90 5 qid:2 2:0.22 5:0.34 6:0.87 10:0.56 12:0.32 19:0.24 20:0.55 ... he structure is follwoing like that: output={} rel=2 qid=1 features={} # the feature list "1:0.32 2:0.50 3:0.78 4:0.02 10:0.90" output.append([rel,qid,features]) ... How can I write my python code to load the data, thanks

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• Which implementation of OrderedDict should be used in python2.6?

  - by Jorge Vargas

  As some of you may know in python2.7/3.2 we'll get OrderedDict with PEP372 however one of the reason the PEP existed was because everyone did their own implementation and they were all sightly incompatible. So which one of the 8 current implementations link text is backwards compatible with the 2.7 odict from python 2.7 in a way we can start using that now and depend on 2.7 in a couple of months?

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• List comprehension for series of deltas

  - by Yuval A

  How would you write a list comprehension in python to generate a series of n-1 deltas between n items in an ordered list? Example: L = [5,9,2,1,7] RES = [5-9,9-2,2-1,1-7] = [4,7,1,6] # absolute values

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• Comments in XML at beginning of document

  - by wanderameise

  my python xml parser fails if there´s a comment at the beginnging of an xml file like:: <?xml version="1.0" encoding="utf-8"?> <!-- Script version: "1"--> <!-- Date: "07052010"--> ... is it illegal to place a comment like this?

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• How do I encode Unicode strings using pyodbc to save to a SAS dataset?

  - by Chris B.

  I'm using Python to read and write SAS datasets, using pyodbc and the SAS ODBC drivers. I can load the data perfectly well, but when I save the data, using something like: cursor.execute('insert into dataset.test VALUES (?)', u'testing') ... I get a pyodbc.Error: ('HY004', '[HY004] [Microsoft][ODBC Driver Manager] SQL data type out of range (0) (SQLBindParameter)') error. The problem seems to be the fact I'm passing a unicode string; what do I need to do to handle this?

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• Is it possible to renice a subprocess ?

  - by ramusus

  I know about os.nice() it works perfect for parent process, but I need to do renice of my child subprocesses. I found way to do this, but it seems to be not very handy and too excessive: os.system("renice -n %d %d" % ( new_nice, suprocess.pid ) ) And it isn't return resulting nice level after renicing. Is there more clean way to renice subprocesses in python?

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• working with django and sqlalchemy but backend mysql

  - by nazmul hasan

  i am working with python django framework but in model part is sqlalchemy and back end data base is mysql how i will configure them???

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• IP address of domain on shared host

  - by Ali

  I have domain on a shared hosting provider. How do I find the direct IP address of my domain using Python? Is it possible to post to a script on my domain using the IP address and not the website itself? Thanks.

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• Get localized language name from locale code

  - by jack

  How can I get localized language name by specified locale code in python? For example: >> get_language_name('ja') >> ('Japanese', u'???')

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• GAE HTTP method support

  - by areich

  I get an "unrecognized HTTP method" when trying to do a REPORT request using httplib and gae. Is there a workaround available? An httplib patch for gae? Do you I have to find another host in order to do this natively? According to the docs, only certain fetch actions are valid: GET, POST, HEAD, PUT, and DELETE: http://code.google.com/appengine/docs/python/urlfetch/ fetchfunction.html

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• Read -> change -> save. Thread safe.

  - by Pavel Alexeev

  This code should automatically connect players when they enter a game. But the problem is when two users try to connect at the same time - in this case 2nd user can easily overwrite changes made by 1st user ('room_1' variable). How could I make it thread safe? def join(userId): users = memcache.get('room_1') users.append(userId) memcache.set('room_1', users) return users I'm using Google App Engine (python) and going to implement simple game-server for exchanging peers given by Adobe Stratus.

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• How do I rename a process on Linux?

  - by jemfinch

  I'm using Python, for what it's worth, but will accept answers in any applicable language. I've tried writing to /proc/$pid/cmdline, but that's a readonly file. I've tried assigning a new string to sys.argv[0], but that has no perceptible impact. Are there any other possibilities? My program is executing processes via os.system (equivalent to system(3)) so a general, *NIX-based solution using an additional spawning process would be fine.

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• Google app engine: empty property in datastore

  - by Pete

  Dear All, Let say I have a model: class A(db.Model): B = db.StringProperty() C = db.StringProperty() How do I query if I wanted to search all empty property (not None, just empty) in C using python?

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• Building proper link with spaces

  - by Joel

  Hello, I have the following code in Python: linkHTML = "<a href=\"page?q=%s\">click here</a>" % strLink The problem is that when strLink has spaces in it the link shows up as <a href="page?q=with space">click here</a> I can use strLink.replace(" ","+") But I am sure there are other characters which can cause errors. I tried using urllib.quote(strLink) But it doesn't seem to help. Thanks! Joel

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• Sending emails with sendmail doesn't work for large emails

  - by Guy

  I'm using python's sendmail in the following way: msg = <SOME MESSAGE> s = smtplib.SMTP('localhost') s.sendmail(me, you, msg.as_string()) s.quit() This usually works fine but it fails when the message is pretty big (around 200 lines). Any ideas what can cause this?

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• Django logging features?

  - by MikeN

  I need to run a lot of Django management commands in the crontab and want to log the output of each run to a special timestamped file. Is there a Django or Python module to help me do this or do I just have to roll my own?

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• receive string with chars

  - by Meloun

  Hi all, i am quite new in python. I am receiving (through pyserial) string with data values. How can I parse these data to particular data structure? I know that 0-1 byte : id 2-5 byte : time1 =>but little endian (lsb first) 6-9 byte : time2 =>but little endian (lsb first) and I looking for a function: def parse_data(string): data={} data['id'] = ?? data['time1'] = ?? data['time2'] = ?? return data thanks

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• Is it possible to autoload a file based on the namespace in PHP?

  - by izym

  Would what mentioned in the title be possible? Python module style that is. See this example for what I exactly mean. index.php <?php use Hello\World; World::greet(); Hello/World.php <?php namespace Hello\World; function greet() { echo 'Hello, World!'; } Would this be possible?

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• Check for a valid domain name in a string?

  - by demos

  I am using python and would like a simple api or regex to check for a domain name's validity. By validity I am the syntactical validity and not whether the domain name actually exists on the Internet or not.

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• How to find out the exact RSS XML path of a website?

  - by Winston

  How do I get the exact feed.xml/rss.xml/atom.xml path of a website? For example, I supplied "http://www.example.com/news/today/this_is_a_news", but the rss is pointing to "http://www.example.com/rss/feed.xml", most modern browsers have this features already and I'm curious how did they get them. Can you cite an example code in ruby, python or bash?

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• How to simulate tuples and sets in C#?

  - by Hesam Qodsi

  I want to use some features of python like as Tuples and Sets in c#. should I implement them? or there are already implemented? could anybody knows a library of dynamic data structures for .net languages?

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• how can I grab video from usb video capture + dvb device with gstreamer?

  - by muimota

  Hi, I own a avermedia volar HX usb stick, I want to capture fromthe composite input , but I can't because I'm unable to select the input. I'm using gstreamer with + python, I think I need to use gsttuner select input but I have no experience using gstreamer's interfaces. Could someone post a simple example? Thanks!

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