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• Odd nested dictionary behavior in python

  - by adept

  Im new two python and am trying to grow a dictionary of dictionaries. I have done this in php and perl but python is behaving very differently. Im sure it makes sense to those more familiar with python. Here is my code: colnames = ['name','dob','id']; tablehashcopy = {}; tablehashcopy = dict.fromkeys(colnames,{}); tablehashcopy['name']['hi'] = 0; print(tablehashcopy); Output: {'dob': {'hi': 0}, 'name': {'hi': 0}, 'id': {'hi': 0}} The problem arises from the 2nd to last statement(i put the print in for convenience). I expected to find that one element has been added to the 'name' dictionary with the key 'hi' and the value 0. But this key,value pair has been added to EVERY sub-dictionary. Why? I have tested this on my ubuntu machine in both python 2.6 and python 3.1 the behaviour is the same.

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• GEdit/Python execution plugin?

  - by Simon Woods

  Hi I'm just starting out learning python with GEdit plus various plugins as my IDE. Visual Studio/F# has a feature which permits the highlighting on a piece of text in the code window which then, on a keypress, gets executed in the F# console. Is there a similar facility/plugin which would enable this sort of behaviour for GEdit/Python? I do have various execution type plugins (Run In Python,Better Python Console) but they don't give me this particular behaviour - or at least I'm not sure how to configure them to give me this. I find it useful because in learning python, I have some test code I want to execute particular individual lines or small segments of code (rather then a complete file) to try and understand what they are doing (and the copy/paste can get a bit tiresome) ... or perhaps there is a better way to do code exploration? Many thx Simon

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• Python Mersenne Twister implementation

  - by B Rivera

  I have Python 3.1.2 and I'm using Windows XP. Where can I see Python's implementation of the Mersenne Twister? In the Python docs it is stated that the Mersenne Twister was written in C and the Python History and License ( http://docs.python.org/py3k/license.html?highlight=mersenne%20twister ) states that "The _random module includes code based on a download from http://www.math.keio.ac.jp/matumoto/MT2002/emt19937ar.html." random.py imports _random which apparently has the Mersenne Twister implementation in it. I can't seem to locate _random. Any thoughts?

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• How can I create a user registration form using datastore - google appengine ??

  - by srivigneshwar

  I am very new to jsp and google appengine , but still I can do something if I get some basic idea , I wanna create an user registration form with fields like name, user id , password, confirm password, etc,. using google appengine datastore feature. and I wanna retrieve user information . Please help me .. Thanks in advance. Thanks for the replies, I need to get some information from user and I want to store it in database, and I will use that information for my application. How can I do that?

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• Curious about python installation paths, especially on OSX.

  - by chiggsy

  First: I'm running Macports. No problems with that, except: /opt/local/Library/Frameworks/Python.framework/Versions/2.6/bin which is the value of sys.exec_prefix, for my macports python even though: /opt/local/lib/python2.6/site-packages/ seems to be quite a logical place to put things, /opt/local being the macports --prefix, as it were. Why does easy_install put things in this odd Frameworks/Python.framework thing? More importantly, can i use the methods here, to ensure that all my systemwide python, particularly the scripts which I really want in /opt/local/bin, things I use all over the place like (i|b)python for example are accessible?

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• How to convert JavaScript dictionary into Python syntax

  - by Sputnix

  Writing out javascript dictionary from inside of JavaScript- enabled application (such as Adobe) into external .jsx file (or any other .txt file) the context of resulted file dictionary looks like: ({one:"1", two:"2"}) (Please note that each dictionary keys are written as they are the variables name (which is not true). A next step is to read this .jsx file with Python. I need to find a way to convert ({one:"1", two:"2"}) into Python dictionary syntax such as: {'one':"1", 'two':"2"} It has been already suggested that instead of using JavaScript's built-in dict.toSource() it would make more sense to use JSON which would write a dictionary content in similar to Python syntax. But unfortunately using JSON is not an option for me. I need to find a way to convert ({one:"1", two:"2"}) into {'one':"1", 'two':"2"} using Python alone. Any suggestions on how to achieve it? Once again, the problem mostly in dictionary keys syntax which inside of Python look like variable names instead of strings-like dictionary keys names: one vs "one"

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• Why can't I see any data in the Google App Engine *Development* Console?

  - by willem

  I run my google app engine application in one of two ways... Directly by using the application from http://localhost:8080 Or execute unit tests from http://localhost:8080/test When I create entities by using the application directly, the data is visible in the Development Console (dataStore view). However, when I execute the unit tests... even if they succeed and I can put() and get() data, the data does not show in the dataStore view. Any idea why I can't see my data? Even though it is there? Notes: I use GAEUnit for unit tests. the data stored mostly consists of StringProperties(). I use Python and run Django on top of the GAE, don't know if that matters.

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• Calculating the pixel size of a string with Python

  - by Aristide

  I have a Python script which needs to calculate the exact size of arbitrary strings displayed in arbitrary fonts in order to generate simple diagrams. I can easily do it with Tkinter. The problem is the results seem to depend on the version of Python and/or the system. import Tkinter as tk import tkFont root = tk.Tk() times12 = tkFont.Font(family="times",size=12) print times12.metrics("linespace"), print times12.measure("Hello world") times24 = tkFont.Font(family="times",size=24) print times24.metrics("linespace"), print times24.measure("Hello world") Python 2.5 on Mac OS X gives the actual pixel measurements: 12 57 24 116 Python 2.6.1 on Mac OS X gives: 14 58 27 115 Python 2.6.3 on Windows XP gives: 19 71 36 154 Such a need being quite common, I suspect I did something wrong. Any idea?

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• Running python batch file that has a path

  - by prosseek

  The batch file is something like this, I put the python in some directory that has SPACE character in its path. C:\"Documents and Settings"\Administrator\Desktop\bracket\python\python C:\\"Documents and Settings"\\Administrator\\Desktop\\bracket\\[10,20]\\brackettest.py When I run this one, I get this error. C:\Documents and Settings\Administrator\Desktop\bracket\python\python: can't ope n file 'C:\Documents and Settings\\Administrator\\Desktop\\bracket\\[10,20]\\bra ckettest.py': [Errno 2] No such file or directory C:\Documents and Settings\Administrator\Desktop\bracket What might be wrong? Wrapping the path doesn't solve this problem. "C:\\Documents and Settings\\Administrator\\Desktop\\bracket\\[10,20]\\brackettest.py"

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• Why is Decimal('0') > 9999.0 True in Python?

  - by parxier

  This is somehow related to my question Why is ''0 True in Python? In Python 2.6.4: >> Decimal('0') > 9999.0 True From the answer to my original question I understand that when comparing objects of different types in Python 2.x the types are ordered by their name. But in this case: >> type(Decimal('0')).__name__ > type(9999.0).__name__ False Why is Decimal('0') > 9999.0 == True then? UPDATE: I usually work on Ubuntu (Linux 2.6.31-20-generic #57-Ubuntu SMP Mon Feb 8 09:05:19 UTC 2010 i686 GNU/Linux, Python 2.6.4 (r264:75706, Dec 7 2009, 18:45:15) [GCC 4.4.1] on linux2). On Windows (WinXP Professional SP3, Python 2.6.4 (r264:75706, Nov 3 2009, 13:23:17) [MSC v.1500 32 bit (Intel)] on win32) my original statement works differently: >> Decimal('0') > 9999.0 False I even more puzzled now. %-(

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• Python, Raspberry, and Arduino Communication

  - by user2924156

  I have been working with my Raspberry, Arduino and applying some Python to make them communicate. I also installed pyserial. If I use IDLE and try the following I get my expected results. >>> import serial >>> ser = serial.Serial('/dev/ttyUSB0',115200) >>> ser.write('x:1\n') 8 >>> ser.readline() 'X:1\r\n' If I write a python scrip and run it I don't get anything back. Here is my python script. import serial ser = serial.Serial('/dev/ttyUSB0', 115200) ser.write('!x:1\n') ser.readline() I am new to Python so looking for some help to understand they this works in IDLE but not as a python script run from terminal. Thanks.

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• How to retrieve Google Appengine Objects by id (Long value) ?

  - by David

  Hi, i have declared an entity the following way: public class MyEntity { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Long id; @Persistent private String text; //getters and setters } Now I want to retrieve the objects using the id. I tried to manage it from the Google Appengine Data Viewer with "SELECT * FROM MyEntity Where id = 382005" or via a query in a servlet. I get no results returned. But i know for sure that the object with the id exists (i made a jsp which queries all objects in the db and displays them in the db). So what is wrong in my query? Am I querying the wrong field? The Google Appengine Data Viewer names the field "ID/name" and it has the value "id=382005". Do I have to query with this names? I've tried but it didn't work out :(

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• Projects to learn Python

  - by Andrew

  I know this isn't a question about a specific snippet of code or anything, but here goes - I've been messing around with the idea of learning Python since I'm pretty bored with PHP (and web development in general), but I can't think of any projects to help me learn. I've already worked through some of Project Euler with Python, but it's getting old. I know the basics, and I want to write something more fun that will introduce me to new things in Python. Is there a cliche beginner project for Python? (for example, PHP's would be a blog or something similiar) Are there any common Python projects for newcomers, or any uncommon ones that you'd suggest? Any ideas would help.

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• Update Params in Python During Infinite Loop

  - by python Dude

  Hello, I was hoping to get some help on a question. I have an infinite loop that I need run and I need to update a set of variables (x in this case) at random times from the command-line. Is there any way to do this? For example: x = 0 while True: x = x + 1 if x < 30: do something and I need to update x's value from the command-line periodically

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• Realtime processing and callbacks with Python and C++

  - by Doughy

  I need to write code to do some realtime processing that is fairly computationally complex. I would like to create some Python classes to manage all my scripting, and leave the intensive parts of the algorithm coded in C++ so that they can run as fast as possible. I would like to instantiate the objects in Python, and have the C++ algorithms chime back into the script with callbacks in python. Something like: myObject = MyObject() myObject.setCallback(myCallback) myObject.run() def myCallback(val): """Do something with the value passed back to the python script.""" pass Will this be possible? How can I run a callback in python from a loop that is running in a C++ module? Anyone have a link or a tutorial to help me do this correctly?

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• ctypes import not working on python 2.5

  - by user551906

  Hi, I am trying to import ctypes, and I am using Python 2.5.5 installed using macports (on Mac OS X 10.6). I get an error saying "ImportError: No module named _ctypes" (see details below). As I understand it ctypes is supposed to come preinstalled for python 2.5. Any suggestions? thanks, Saurabh Error details: $ python Python 2.5.5 (r255:77872, Nov 30 2010, 00:05:47) [GCC 4.2.1 (Apple Inc. build 5659)] on darwin Type "help", "copyright", "credits" or "license" for more information. import ctypes Traceback (most recent call last): File "", line 1, in File "/opt/local/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/ctypes/init.py", line 10, in from _ctypes import Union, Structure, Array ImportError: No module named _ctypes

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• SWIG: Throwing exceptions from Python to C++

  - by wheaties

  We've got an interface we've defined in C++ (abstract class, all functions pure virtual) which will be extended in Python. To overcome the cross-language polymorphism issues we're planning on using SWIG directors. I've read how to catch exceptions thrown from C++ code in our Python code here, here, here, and even on SO. It's fairly straight forward and I'm not expecting issues with handling our library's own exceptions. What I'd like to know and can't seem to find in the documentation is how to have our Python implementation of the extended C++ interface throw those C++ exceptions in a way that makes them visible to the C++ code. We could make small functions within the *.i files such that each function throws our exceptions: void throw_myException(){ throw MyException; } but I'm wondering how it will interact with the Python code. Anyone have any experience with throwing C++ exceptions from Python code?

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• app engine's back referencing is too slow. How can I make it faster?

  - by Ray Yun

  Google app engine has smart feature named back references and I usually iterate them where the traditional SQL's computed column need to be used. Just imagine that need to accumulate specific force's total hp. class Force(db.Model): hp = db.IntegerProperty() class UnitGroup(db.Model): force = db.ReferenceProperty(reference_class=Force,collection_name="groups") hp = db.IntegerProperty() class Unit(db.Model): group = db.ReferenceProperty(reference_class=UnitGroup,collection_name="units") hp = db.IntegerProperty() When I code like following, it was horribly slow (almost 3s) with 20 forces with single group - single unit. (I guess back-referencing force reload sub entities. Am I right?) def get_hp(self): hp = 0 for group in self.groups: group_hp = 0 for unit in group.units: group_hp += unit.hp hp += group_hp return hp How can I optimize this code? Please consider that there are more properties should be computed for each force/unit-groups and I don't want to save these collective properties to each entities. :)

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• Google I/O 2011: Fireside Chat with the App Engine Team

  Google I/O 2011: Fireside Chat with the App Engine Team Max Ross, Max is a Software Engineer on the App Engine team where he leads the development of the datastore & occasionally tinkers with the Java runtime. He is also the founder of the Hibernate Shards project. Alon Levi, Sean Lynch, Greg Dalesandre, Guido van Rossum, Brett Slatkin, Peter Magnusson, Mickey Kataria, Peter McKenzie Fireside chat with the App Engine team From: GoogleDevelopers Views: 2045 5 ratings Time: 01:01:25 More in Entertainment

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• Google Compute Engine Office Hours: August 22, 2012

  Google Compute Engine Office Hours: August 22, 2012 Office hours with the Google Compute Engine Team on August 22, 2012. The slides can be viewed here: goo.gl The tech talk portion of this session was about OAuth and Service Accounts, an area which the Google Compute Engine team has done a great job simplifying. From: GoogleDevelopers Views: 80 7 ratings Time: 52:42 More in Science & Technology

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• Google I/O 2010 - Appstats - instrumentation for App Engine

  Google I/O 2010 - Appstats - instrumentation for App Engine Google I/O 2010 - Appstats - RPC instrumentation and optimizations for App Engine App Engine 201 Guido van Rossum Appstats is a pure userland library (for Python and Java) that inserts instrumentation hooks into the App Engine runtime at the interface between the runtime and services like the datastore. The collected statistics can be browsed in a rich UI which allows drilling down to various levels of detail. The talk will also discuss common optimizations to address typical findings. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 19 0 ratings Time: 59:31 More in Science & Technology

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• Easiest, most fun way to program 2D games? Flash? XNA? Some other engine?

  - by Maxi

  Hi, this is a post detailing my search for the most enjoyable way for a hobbyist game programmer to sweeten his free time with making a game. My requirements: I looked at Flash first, I made a couple of small games but I'm doubtful of the performance. I would like to make a fairly large strategy game, with several hundred units fighting simultaneously, explosions and animations included. Also zoomable maps. I saw that Adobe has a new 3D API for Flash, but I don't know if that improves 2D performance aswell, I couldn't find anything related to that question on their MAX10 sessions. Would you say that Flash is a good technology for making large 2D games easily? I really like Actionscript, and I love how easy everything is in Flash. There are several engines available which make it even easier. I just do this for fun, and it would be even better if there were proper animation/particle editors available and if the engine I were to use, would be available for multiple platforms. (so more people can play my game once finished). I'd like to have it available on many mobile platforms aswell. (because I love touch input for some reason) I do know the XNA framework pretty well, but there are no good engines available for it, and it will only run on Windows, which is a huge turn off. Even bigger is, that you need to install the XNA redistributable each time you want to give the game to someone. If I use XNA, I would have to make all the tools myself, and I'd probably have to make them with WPF. (I'd love to make tools with Adobe AIR, but unfortunately the API's for image manipulation etc. are far worse in Flash, than they are in XNA/WPF.) Now, I'm aware that I could make my own engine that supports each of those platforms, but quite frankly, that would be too much work plowing through APIs. After all, I want to make a game, not an engine. So the question becomes: Is there maybe a cross platform (free or free to develop?) engine available that I could use for 2D development? I prefer: C#, Actionscript. I don't mind using c++ if the toolset is above average, but I highly doubt that there is something out there like that. Please prove me wrong :) So summary: I'd like to use Flash, but I don't know if it scales well enough. I'm not a scripter, I want some real APIs that I can work with inside a proper IDE. Just for information, I looked at several alternatives, I'm actually looking for a long time already. You'd help me a lot to make a decision finally. Feature-wise the Flatredball engine would be ideal. But I tried their tools, and quite frankly, they are horrible. Absolutely unusable, I'd need to make my own for sure. I didn't look at their API, but if their tools are so bad, I'm not inclined to look further. Unity3D. This one is quite nice, but I really don't need 3D, and it is quite ...a lot of work to learn. I also don't like that it is so expensive to use for different platforms and that I can only code for it through scripting. You have to buy each platform separately. The editor usability is average, the product overall is good enough for most purposes, but learning it myself would be overkill. Shiva 3D. It looks good enough, but again: I don't really need 3D. The editor usability is a little worse than Unity3D in my opinion and it wasn't clear to me how to start programming. I think it requires C++ for coding, so that's a negative too. I want to have fun, and c# is fun ;) SDL. Quite frankly, I'd still need to port to all those different SDL implementations. And I don't like OpenGL style programming, it's just plain ugly. And it needs c++, I know that there might be some wrappers available, but I don't like to use wrappers, because... Irrlicht. A lot of features, but support seems to be low and it is aimed at enthusiasts. C# bindings get dropped repeatedly. I'm not an engine enthusiast, I just want to make a game. I don't see this happening with Irrlicht. Ogre3D. Way too much work, it's just a graphics engine. Also no multiple platform support and c++. Torque2D. Costs something to use, and I didn't hear a lot of good things about support and documentation. Also costs extra for each platform.

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• Google I/O 2010 - What's hot in Java for App Engine

  Google I/O 2010 - What's hot in Java for App Engine Google I/O 2010 - What's hot in Java for App Engine App Engine 201 Toby Reyelts, Don Schwarz Learn what's new with Java on App Engine. We'll take a whirlwind tour through the changes since last year, walk through a code sample for task queues and the new blobstore service, and demonstrate techniques for improving your application's performance. We'll top it off with a glimpse into some new features that we've planned for the year ahead. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 8 0 ratings Time: 01:02:10 More in Science & Technology

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• How do I stop Python install on Mac OS X from putting things in my home directory?

  - by Rob

  Hi, I'm trying to install Python from source on my Mac. (OS X 10.6.2, Python-2.6.5.tar.bz2) I've done this before and it was easy, but for some reason, this time after ./configure, and make, the sudo make install puts things some things in my home directory instead of in /usr/local/... where I expect. The .py files are okay, but not the .so files... RobsMac Python-2.6.5 $ sudo make install [...] /usr/bin/install -c -m 644 ./Lib/anydbm.py /usr/local/lib/python2.6 /usr/bin/install -c -m 644 ./Lib/ast.py /usr/local/lib/python2.6 /usr/bin/install -c -m 644 ./Lib/asynchat.py /usr/local/lib/python2.6 [...] running build_scripts running install_lib creating /Users/rob/Library/Python creating /Users/rob/Library/Python/2.6 creating /Users/rob/Library/Python/2.6/site-packages copying build/lib.macosx-10.4-x86_64-2.6/_AE.so - /Users/rob/Library/ Python/2.6/site-packages copying build/lib.macosx-10.4-x86_64-2.6/_AH.so - /Users/rob/Library/ Python/2.6/site-packages copying build/lib.macosx-10.4-x86_64-2.6/_App.so - /Users/rob/Library/ Python/2.6/site-packages [...] Later, this causes imports that require those .so files to fail. For example... RobsMac Python-2.6.5 $ python Python 2.6.5 (r265:79063, Apr 28 2010, 13:40:18) [GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import zlib Traceback (most recent call last):     File "", line 1, in ImportError: No module named zlib Any ideas what is wrong? thanks, Rob

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• OSGI on google app engine?

  - by Patrick Cornelissen

  I am evaluating several technologies for an open source app for the google app engine. I'm searching for information regarding OSGI on googles app engine. I have found Lemmon but it seems to be a dead project. The last checkin was in mid 2009... :-/ There is also a eclipse blog entry from april 2009, but it's not a real success story. Has anyone successfully used OSGI in a GAE app?

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