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# Does an application-wide exception handler make sense? ## Question Long story short, I have a substantial Python application that, among other things, does outcalls to "losetup", "mount", etc. on Linux. Essentially consuming system resources that must be released when complete. If my application crashes, I want to...
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# Does an application-wide exception handler make sense? ## Question Long story short, I have a substantial Python application that, among other things, does outcalls to "losetup", "mount", etc. on Linux. Essentially consuming system resources that must be released when complete. If my application crashes, I want to...
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# Does an application-wide exception handler make sense? ## Question Long story short, I have a substantial Python application that, among other things, does outcalls to "losetup", "mount", etc. on Linux. Essentially consuming system resources that must be released when complete. If my application crashes, I want to...
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# Does an application-wide exception handler make sense? ## Question Long story short, I have a substantial Python application that, among other things, does outcalls to "losetup", "mount", etc. on Linux. Essentially consuming system resources that must be released when complete. If my application crashes, I want to...
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# How to associated the cn in an ssl cert of pyOpenSSL verify_cb to a generated socket ## Question I am a little new to pyOpenSSL. I am trying to figure out how to associate the generated socket to an ssl cert. verify_cb gets called which give me access to the cert and a conn but how do I associate those things when...
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# How to load a python module into a fresh interactive shell in Komodo? ## Question When using PyWin I can easily load a python file into a fresh interactive shell and I find this quite handy for prototyping and other exploratory tasks. I would like to use Komodo as my python editor, but I haven't found a replacement...
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# How do I use Django templates without the rest of Django? ## Question I want to use the Django template engine in my (Python) code, but I'm not building a Django-based web site. How do I use it without having a settings.py file (and others) and having to set the DJANGO_SETTINGS_MODULE environment variable? If I ru...
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# How do I use Django templates without the rest of Django? ## Question I want to use the Django template engine in my (Python) code, but I'm not building a Django-based web site. How do I use it without having a settings.py file (and others) and having to set the DJANGO_SETTINGS_MODULE environment variable? If I ru...
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# How do I use Django templates without the rest of Django? ## Question I want to use the Django template engine in my (Python) code, but I'm not building a Django-based web site. How do I use it without having a settings.py file (and others) and having to set the DJANGO_SETTINGS_MODULE environment variable? If I ru...
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# How do I use Django templates without the rest of Django? ## Question I want to use the Django template engine in my (Python) code, but I'm not building a Django-based web site. How do I use it without having a settings.py file (and others) and having to set the DJANGO_SETTINGS_MODULE environment variable? If I ru...
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# How do I use Django templates without the rest of Django? ## Question I want to use the Django template engine in my (Python) code, but I'm not building a Django-based web site. How do I use it without having a settings.py file (and others) and having to set the DJANGO_SETTINGS_MODULE environment variable? If I ru...
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# How do I use Django templates without the rest of Django? ## Question I want to use the Django template engine in my (Python) code, but I'm not building a Django-based web site. How do I use it without having a settings.py file (and others) and having to set the DJANGO_SETTINGS_MODULE environment variable? If I ru...
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# How do I use Django templates without the rest of Django? ## Question I want to use the Django template engine in my (Python) code, but I'm not building a Django-based web site. How do I use it without having a settings.py file (and others) and having to set the DJANGO_SETTINGS_MODULE environment variable? If I ru...
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# How do I use Django templates without the rest of Django? ## Question I want to use the Django template engine in my (Python) code, but I'm not building a Django-based web site. How do I use it without having a settings.py file (and others) and having to set the DJANGO_SETTINGS_MODULE environment variable? If I ru...
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# What is the best solution for database connection pooling in python? ## Question I have developed some custom DAO-like classes to meet some very specialized requirements for my project that is a server-side process that does not run inside any kind of framework. The solution works great except that every time a n...
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# What is the best solution for database connection pooling in python? ## Question I have developed some custom DAO-like classes to meet some very specialized requirements for my project that is a server-side process that does not run inside any kind of framework. The solution works great except that every time a n...
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# What is the best solution for database connection pooling in python? ## Question I have developed some custom DAO-like classes to meet some very specialized requirements for my project that is a server-side process that does not run inside any kind of framework. The solution works great except that every time a n...
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# What is the best solution for database connection pooling in python? ## Question I have developed some custom DAO-like classes to meet some very specialized requirements for my project that is a server-side process that does not run inside any kind of framework. The solution works great except that every time a n...
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# What is the best solution for database connection pooling in python? ## Question I have developed some custom DAO-like classes to meet some very specialized requirements for my project that is a server-side process that does not run inside any kind of framework. The solution works great except that every time a n...
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# What is the best solution for database connection pooling in python? ## Question I have developed some custom DAO-like classes to meet some very specialized requirements for my project that is a server-side process that does not run inside any kind of framework. The solution works great except that every time a n...
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# What is a metaclass in Python? ## Question What are metaclasses? What do you use them for? ## Answer Metaclasses are the secret sauce that make 'class' work. The default metaclass for a new style object is called 'type'. class type(object) | type(object) -> the object's type | type(name, bases, dict) -> a ne...
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# What is a metaclass in Python? ## Question What are metaclasses? What do you use them for? ## Answer I think the ONLamp introduction to metaclass programming is well written and gives a really good introduction to the topic despite being several years old already. http://www.onlamp.com/pub/a/python/2003/04/17/meta...
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# What is a metaclass in Python? ## Question What are metaclasses? What do you use them for? ## Answer One use for metaclasses is adding new properties and methods to an instance automatically. For example, if you look at Django models, their definition looks a bit confusing. It looks as if you are only defining cla...
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# What is a metaclass in Python? ## Question What are metaclasses? What do you use them for? ## Answer A metaclass is the class of a class. Like a class defines how an instance of the class behaves, a metaclass defines how a class behaves. A class is an instance of a metaclass. While in Python you can use arbitrar...
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# What is a metaclass in Python? ## Question What are metaclasses? What do you use them for? ## Answer Others have explained how metaclasses work and how they fit into the Python type system. Here's an example of what they can be used for. In a testing framework I wrote, I wanted to keep track of the order in which c...
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# What is a metaclass in Python? ## Question What are metaclasses? What do you use them for? ## Answer Classes as objects Before understanding metaclasses, you need to master classes in Python. And Python has a very peculiar idea of what classes are, borrowed from the Smalltalk language. In most languages, classes ...
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# What is a metaclass in Python? ## Question What are metaclasses? What do you use them for? ## Answer A metaclass is a class that tells how (some) other class should be created. This is a case where I saw metaclass as a solution to my problem: I had a really complicated problem, that probably could have been solved...
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# What is a metaclass in Python? ## Question What are metaclasses? What do you use them for? ## Answer What are metaclasses? What do you use them for? A class is to an instance as a metaclass is to a class. Put another way, a class is an instance of a metaclass. Put a third way, a metaclass is a class's class. ...
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# What is a metaclass in Python? ## Question What are metaclasses? What do you use them for? ## Answer Python 3 update There are (at this point) two key methods in a metaclass: __prepare__, and __new__ __prepare__ lets you supply a custom mapping (such as an OrderedDict) to be used as the namespace while the cla...
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# What is a metaclass in Python? ## Question What are metaclasses? What do you use them for? ## Answer type is actually a metaclass -- a class that creates another classes. Most metaclass are the subclasses of type. The metaclass receives the new class as its first argument and provide access to class object with det...
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# What is the standard way to add N seconds to datetime.time in Python? ## Question Given a datetime.time value in Python, is there a standard way to add an integer number of seconds to it, so that 11:34:59 + 3 = 11:35:02, for example? These obvious ideas don't work: >>> datetime.time(11, 34, 59) + 3 TypeError: unsu...
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# What is the standard way to add N seconds to datetime.time in Python? ## Question Given a datetime.time value in Python, is there a standard way to add an integer number of seconds to it, so that 11:34:59 + 3 = 11:35:02, for example? These obvious ideas don't work: >>> datetime.time(11, 34, 59) + 3 TypeError: unsu...
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# What is the standard way to add N seconds to datetime.time in Python? ## Question Given a datetime.time value in Python, is there a standard way to add an integer number of seconds to it, so that 11:34:59 + 3 = 11:35:02, for example? These obvious ideas don't work: >>> datetime.time(11, 34, 59) + 3 TypeError: unsu...
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# What is the standard way to add N seconds to datetime.time in Python? ## Question Given a datetime.time value in Python, is there a standard way to add an integer number of seconds to it, so that 11:34:59 + 3 = 11:35:02, for example? These obvious ideas don't work: >>> datetime.time(11, 34, 59) + 3 TypeError: unsu...
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# What is the standard way to add N seconds to datetime.time in Python? ## Question Given a datetime.time value in Python, is there a standard way to add an integer number of seconds to it, so that 11:34:59 + 3 = 11:35:02, for example? These obvious ideas don't work: >>> datetime.time(11, 34, 59) + 3 TypeError: unsu...
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# What is the standard way to add N seconds to datetime.time in Python? ## Question Given a datetime.time value in Python, is there a standard way to add an integer number of seconds to it, so that 11:34:59 + 3 = 11:35:02, for example? These obvious ideas don't work: >>> datetime.time(11, 34, 59) + 3 TypeError: unsu...
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# How can I analyze Python code to identify problematic areas? ## Question I have a large source repository split across multiple projects. I would like to produce a report about the health of the source code, identifying problem areas that need to be addressed. Specifically, I'd like to call out routines with a high...
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# How can I analyze Python code to identify problematic areas? ## Question I have a large source repository split across multiple projects. I would like to produce a report about the health of the source code, identifying problem areas that need to be addressed. Specifically, I'd like to call out routines with a high...
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# How can I analyze Python code to identify problematic areas? ## Question I have a large source repository split across multiple projects. I would like to produce a report about the health of the source code, identifying problem areas that need to be addressed. Specifically, I'd like to call out routines with a high...
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# How can I analyze Python code to identify problematic areas? ## Question I have a large source repository split across multiple projects. I would like to produce a report about the health of the source code, identifying problem areas that need to be addressed. Specifically, I'd like to call out routines with a high...
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# How can I analyze Python code to identify problematic areas? ## Question I have a large source repository split across multiple projects. I would like to produce a report about the health of the source code, identifying problem areas that need to be addressed. Specifically, I'd like to call out routines with a high...
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# How can I analyze Python code to identify problematic areas? ## Question I have a large source repository split across multiple projects. I would like to produce a report about the health of the source code, identifying problem areas that need to be addressed. Specifically, I'd like to call out routines with a high...
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# How can I analyze Python code to identify problematic areas? ## Question I have a large source repository split across multiple projects. I would like to produce a report about the health of the source code, identifying problem areas that need to be addressed. Specifically, I'd like to call out routines with a high...
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# Python on Windows - how to wait for multiple child processes? ## Question How to wait for multiple child processes in Python on Windows, without active wait (polling)? Something like this almost works for me: proc1 = subprocess.Popen(['python','mytest.py']) proc2 = subprocess.Popen(['python','mytest.py']) proc1...
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# Python on Windows - how to wait for multiple child processes? ## Question How to wait for multiple child processes in Python on Windows, without active wait (polling)? Something like this almost works for me: proc1 = subprocess.Popen(['python','mytest.py']) proc2 = subprocess.Popen(['python','mytest.py']) proc1...
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# Python on Windows - how to wait for multiple child processes? ## Question How to wait for multiple child processes in Python on Windows, without active wait (polling)? Something like this almost works for me: proc1 = subprocess.Popen(['python','mytest.py']) proc2 = subprocess.Popen(['python','mytest.py']) proc1...
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# Python on Windows - how to wait for multiple child processes? ## Question How to wait for multiple child processes in Python on Windows, without active wait (polling)? Something like this almost works for me: proc1 = subprocess.Popen(['python','mytest.py']) proc2 = subprocess.Popen(['python','mytest.py']) proc1...
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# Python on Windows - how to wait for multiple child processes? ## Question How to wait for multiple child processes in Python on Windows, without active wait (polling)? Something like this almost works for me: proc1 = subprocess.Popen(['python','mytest.py']) proc2 = subprocess.Popen(['python','mytest.py']) proc1...
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# Why is "if not someobj:" better than "if someobj == None:" in Python? ## Question I've seen several examples of code like this: if not someobj: #do something But I'm wondering why not doing: if someobj == None: #do something Is there any difference? Does one have an advantage over the other? ## Answer...
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# Why is "if not someobj:" better than "if someobj == None:" in Python? ## Question I've seen several examples of code like this: if not someobj: #do something But I'm wondering why not doing: if someobj == None: #do something Is there any difference? Does one have an advantage over the other? ## Answer...
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# Why is "if not someobj:" better than "if someobj == None:" in Python? ## Question I've seen several examples of code like this: if not someobj: #do something But I'm wondering why not doing: if someobj == None: #do something Is there any difference? Does one have an advantage over the other? ## Answer...
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# Why is "if not someobj:" better than "if someobj == None:" in Python? ## Question I've seen several examples of code like this: if not someobj: #do something But I'm wondering why not doing: if someobj == None: #do something Is there any difference? Does one have an advantage over the other? ## Answer...
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# Why is "if not someobj:" better than "if someobj == None:" in Python? ## Question I've seen several examples of code like this: if not someobj: #do something But I'm wondering why not doing: if someobj == None: #do something Is there any difference? Does one have an advantage over the other? ## Answer...
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# Why is "if not someobj:" better than "if someobj == None:" in Python? ## Question I've seen several examples of code like this: if not someobj: #do something But I'm wondering why not doing: if someobj == None: #do something Is there any difference? Does one have an advantage over the other? ## Answer...
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# Building Python C extension modules for Windows ## Question I have a C extension module and it would be nice to distribute built binaries. Setuptools makes it easy to build extensions modules on OS X and GNU/Linux, since those OSs come with GCC, but I don't know how to do it in Windows. Would I need to buy a copy o...
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# Building Python C extension modules for Windows ## Question I have a C extension module and it would be nice to distribute built binaries. Setuptools makes it easy to build extensions modules on OS X and GNU/Linux, since those OSs come with GCC, but I don't know how to do it in Windows. Would I need to buy a copy o...
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# How do I read text from the (windows) clipboard from python? ## Question How do I read text from the (windows) clipboard from python? ## Answer Try win32clipboard from the win32all package (that's probably installed if you're on ActiveState Python). See sample here: http://code.activestate.com/recipes/474121/ Tag...
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# How do I read text from the (windows) clipboard from python? ## Question How do I read text from the (windows) clipboard from python? ## Answer You can use the module called win32clipboard, which is part of pywin32. Here is an example that first sets the clipboard data then gets it: import win32clipboard # set c...
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# How do I read text from the (windows) clipboard from python? ## Question How do I read text from the (windows) clipboard from python? ## Answer I've seen many suggestions to use the win32 module, but Tkinter provides the shortest and easiest method I've seen, as in this post: How do I copy a string to the clipboard...
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# How do I read text from the (windows) clipboard from python? ## Question How do I read text from the (windows) clipboard from python? ## Answer The most upvoted answer above is weird in a way that it simply clears the Clipboard and then gets the content (which is then empty). One could clear the clipboard to be sur...
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# How do I read text from the (windows) clipboard from python? ## Question How do I read text from the (windows) clipboard from python? ## Answer If you don't want to install extra packages, ctypes can get the job done as well. import ctypes CF_TEXT = 1 kernel32 = ctypes.windll.kernel32 user32 = ctypes.windll.user...
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# How do I read text from the (windows) clipboard from python? ## Question How do I read text from the (windows) clipboard from python? ## Answer you can easily get this done through the built-in module Tkinter which is basically a GUI library. This code creates a blank widget to get the clipboard content from OS. #...
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# How do I read text from the (windows) clipboard from python? ## Question How do I read text from the (windows) clipboard from python? ## Answer For my console program the answers with tkinter above did not quite work for me because the .destroy() always gave an error,: can't invoke "event" command: application ...
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# How do I read text from the (windows) clipboard from python? ## Question How do I read text from the (windows) clipboard from python? ## Answer Use Pythons library Clipboard Its simply used like this: import clipboard clipboard.copy("this text is now in the clipboard") print clipboard.paste() Tags: python, win...
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# Is there a zip-like method in .Net? ## Question In Python there is a really neat function called zip which can be used to iterate through two lists at the same time: list1 = [1, 2, 3] list2 = ["a", "b", "c"] for v1, v2 in zip(list1, list2): print v1 + " " + v2 The above code shoul produce the following: 1 a ...
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# Is there a zip-like method in .Net? ## Question In Python there is a really neat function called zip which can be used to iterate through two lists at the same time: list1 = [1, 2, 3] list2 = ["a", "b", "c"] for v1, v2 in zip(list1, list2): print v1 + " " + v2 The above code shoul produce the following: 1 a ...
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# Is there a zip-like method in .Net? ## Question In Python there is a really neat function called zip which can be used to iterate through two lists at the same time: list1 = [1, 2, 3] list2 = ["a", "b", "c"] for v1, v2 in zip(list1, list2): print v1 + " " + v2 The above code shoul produce the following: 1 a ...
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# Is there a zip-like method in .Net? ## Question In Python there is a really neat function called zip which can be used to iterate through two lists at the same time: list1 = [1, 2, 3] list2 = ["a", "b", "c"] for v1, v2 in zip(list1, list2): print v1 + " " + v2 The above code shoul produce the following: 1 a ...
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# IronClad equivalent for Jython ## Question For IronPython there is a project - IronClad, that aims to transparently run C extensions in it. Is there a similiar project for Jython? ## Answer You can probably use Java's loadLibrary to do that (provided it works in your platform's java). It is in the java library: jav...
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# IronClad equivalent for Jython ## Question For IronPython there is a project - IronClad, that aims to transparently run C extensions in it. Is there a similiar project for Jython? ## Answer Keep an eye on JyNI (http://www.jyni.org), which is to Jython exactly what is Ironclad to IronPython. As of this writing JyNI ...
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# How do you access an authenticated Google App Engine service from a (non-web) python client? ## Question I have a Google App Engine app - http://mylovelyapp.appspot.com/ It has a page - mylovelypage For the moment, the page just does self.response.out.write('OK') If I run the following Python at my computer: impo...
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# How do you access an authenticated Google App Engine service from a (non-web) python client? ## Question I have a Google App Engine app - http://mylovelyapp.appspot.com/ It has a page - mylovelypage For the moment, the page just does self.response.out.write('OK') If I run the following Python at my computer: impo...
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# How do you access an authenticated Google App Engine service from a (non-web) python client? ## Question I have a Google App Engine app - http://mylovelyapp.appspot.com/ It has a page - mylovelypage For the moment, the page just does self.response.out.write('OK') If I run the following Python at my computer: impo...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer Not at the moment and you would...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer As a Python lover and Android p...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer I just posted some directions f...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer YES! An example via Matt Cutts...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer There is also the new Android S...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer Check out the blog post http://...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer "The Pygame Subset for Android ...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer There's also python-on-a-chip p...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer There's also SL4A written by a ...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer I've posted instructions and a ...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer One way is to use Kivy: Ope...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer Using SL4A (which has already b...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer From the Python for android sit...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer SL4A Scripting Layer for Andro...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer Yet another attempt: https://co...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer You can run your Python code us...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer I use the QPython application. ...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer Didn't see this posted here, bu...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer Kivy I want to post this as ...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer Another option if you are looki...
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# Is there a way to run Python on Android? ## Question We are working on an S60 version and this platform has a nice Python API. However, there is nothing official about Python on Android, but since Jython exists, is there a way to let the snake and the robot work together? ## Answer One more option seems to be pyq...
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# Sorting a dict on __iter__ ## Question I am trying to sort a dict based on its key and return an iterator to the values from within an overridden iter method in a class. Is there a nicer and more efficient way of doing this than creating a new list, inserting into the list as I sort through the keys? ## Answer By f...
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# Sorting a dict on __iter__ ## Question I am trying to sort a dict based on its key and return an iterator to the values from within an overridden iter method in a class. Is there a nicer and more efficient way of doing this than creating a new list, inserting into the list as I sort through the keys? ## Answer How ...
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# Sorting a dict on __iter__ ## Question I am trying to sort a dict based on its key and return an iterator to the values from within an overridden iter method in a class. Is there a nicer and more efficient way of doing this than creating a new list, inserting into the list as I sort through the keys? ## Answer def ...
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# What can you use Python generator functions for? ## Question I'm starting to learn Python and I've come across generator functions, those that have a yield statement in them. I want to know what types of problems that these functions are really good at solving. ## Answer See the "Motivation" section in PEP 255. A...
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# What can you use Python generator functions for? ## Question I'm starting to learn Python and I've come across generator functions, those that have a yield statement in them. I want to know what types of problems that these functions are really good at solving. ## Answer Generators give you lazy evaluation. You us...
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# What can you use Python generator functions for? ## Question I'm starting to learn Python and I've come across generator functions, those that have a yield statement in them. I want to know what types of problems that these functions are really good at solving. ## Answer Basically avoiding call-back functions when...
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