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python Programming Glossary: anWhat is a metaclass in Python? http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python improve this question Classes as objects Before understanding metaclasses you need to master classes in Python. And Python.. idea of what classes are borrowed from the Smalltalk language. In most languages classes are just pieces of code that.. classes are borrowed from the Smalltalk language. In most languages classes are just pieces of code that describe how to produce..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained in Python What does it do For example I'm trying to understand this code def node._get_child_candidates self distance min_dist.. I'm trying to understand this code def node._get_child_candidates self distance min_dist max_dist if self._leftchild and.. this code def node._get_child_candidates self distance min_dist max_dist if self._leftchild and distance max_dist..
http://stackoverflow.com/questions/509211/pythons-slice-notation powerful but I haven't quite got my head around it and am looking for a good guide. python slice share improve.. of the whole array There is also the step value which can be used with any of the above a start end step # start through.. array There is also the step value which can be used with any of the above a start end step # start through not past end..
How do I read text from the (windows) clipboard from python? http://stackoverflow.com/questions/101128/how-do-i-read-text-from-the-windows-clipboard-from-python win32clipboard.CloseClipboard print data An important reminder from the documentation When the window has..
http://stackoverflow.com/questions/1151658/python-hashable-dicts the same time as the function that parses the rule. Edit An additional problem with namedtuple s is that they are strictly..
Python List Comprehension Vs. Map http://stackoverflow.com/questions/1247486/python-list-comprehension-vs-map not all pythonistas consider them more direct and clearer. An example of the tiny speed advantage of map when using exactly.. x for x in xs ' 100000 loops best of 3 5.58 usec per loop An example of how performance comparison gets completely reversed..
http://stackoverflow.com/questions/2213551/installing-scipy-with-pip python install scipy pip share improve this question An attempt to easy_install indicates a problem with their listing..
The Python yield keyword explained http://stackoverflow.com/questions/231767/the-python-yield-keyword-explained and distance max_dist self._median yield self._rightchild And this is the caller result candidates list self while candidates.. what yield does you must understand what generators are. And before generators come iterables. Iterables When you create.. of children and you don't want them all stored in memory. And it works because Python does not care if the argument of a..
Where to put Django startup code? http://stackoverflow.com/questions/2781383/where-to-put-django-startup-code but that would get called each time my app is accessed. An possible solution might be to create a middleware that does..
An executable Python app [closed] http://stackoverflow.com/questions/2933/an-executable-python-app executable Python app closed Python works on multiple platforms..
Compiled vs. Interpreted Languages http://stackoverflow.com/questions/3265357/compiled-vs-interpreted-languages directly to the ADD instruction in machine code. An interpreted language is one where the instructions are not directly.. quite powerful optimisations during the compile stage And here are the advantages of interpreted languages Easier to..
What does ** (double star) and * (star) do for python parameters? http://stackoverflow.com/questions/36901/what-does-double-star-and-star-do-for-python-parameters and some variable arguments def foo kind args kwargs pass An other usage of the l idiom is to unpack argument lists when..
Python: Is there a way to determine the encoding of text file? http://stackoverflow.com/questions/436220/python-is-there-a-way-to-determine-the-encoding-of-text-file also use UnicodeDammit . It will try the following methods An encoding discovered in the document itself for instance in an.. then it will ignore any encoding it finds in the document. An encoding sniffed by looking at the first few bytes of the file... stage it will be one of the UTF encodings EBCDIC or ASCII. An encoding sniffed by the chardet library if you have it installed...
How can I make an EXE file from a Python program? [duplicate] http://stackoverflow.com/questions/49146/how-can-i-make-an-exe-file-from-a-python-program duplicate This question already has an answer here An executable Python app closed 9 answers How to deploy..
How to write the Fibonacci Sequence in Python http://stackoverflow.com/questions/494594/how-to-write-the-fibonacci-sequence-in-python someone please point me in the direction on how to do this Any help is welcome. I'm a learning programmer and I've run into.. wikipedia and on wolfram . A lot more than you may need. Anyway it is a good thing to learn how to use these resource to.. in Python def F n return 1 sqrt 5 n 1 sqrt 5 n 2 n sqrt 5 An other way to do it is following the definition from wikipedia..
Python string formatting: % vs. .format http://stackoverflow.com/questions/5082452/python-string-formatting-vs-format I still take a hit for performing the following operation And if so is there a way to avoid this log.debug some debug info.. do stuff like re use arguments which you can't do with . An annoying thing about is also how it can either take a variable.. when the string formatting expression is evaluated. And Python not being a lazy language evaluates expressions before..
Creating a singleton in python http://stackoverflow.com/questions/6760685/creating-a-singleton-in-python inheritance Uses __metaclass__ for its proper purpose And made me aware of it Cons Are there any Method 4 decorator returning.. 'SingletonMeta' object pass class Logger Singleton pass An ironic aspect of this approach is that it's using subclassing..
How do you validate a URL with a regular expression in Python? http://stackoverflow.com/questions/827557/how-do-you-validate-a-url-with-a-regular-expression-in-python regex google app engine share improve this question An easy way to parse and validate URL's is the urlparse module...
How do I check if a file exists using Python? http://stackoverflow.com/questions/82831/how-do-i-check-if-a-file-exists-using-python condition that can often lead to security vulnerabilities. An attacker can create a symlink to an arbitrary file immediately..
http://stackoverflow.com/questions/929029/how-do-i-access-the-child-classes-of-an-object-in-django-without-knowing-the-nam import models class InheritanceCastModel models.Model An abstract base class that provides a ``real_type`` FK to ContentType...
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