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How to add property to a class dynamically?
...ibute, on a given class. Kinda like a way to factor a huge if tree out of __getattribute__.
When I ask for foo.b in the example above, Python sees that the b defined on the class implements the descriptor protocol—which just means it's an object with a __get__, __set__, or __delete__ method. Th...
How to run functions in parallel?
...starting'
for i in xrange(10000000): pass
print 'func2: finishing'
if __name__ == '__main__':
p1 = Process(target=func1)
p1.start()
p2 = Process(target=func2)
p2.start()
p1.join()
p2.join()
The mechanics of starting/joining child processes can easily be encapsulated into a functio...
Using python's eval() vs. ast.literal_eval()?
...
datamap = eval(raw_input('Provide some data here: ')) means that you actually evaluate the code before you deem it to be unsafe or not. It evaluates the code as soon as the function is called. See also the dangers of eval.
ast.literal_eval ra...
How to fix “Attempted relative import in non-package” even with __init__.py
...
Yes. You're not using it as a package.
python -m pkg.tests.core_test
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What is the id( ) function used for?
...d and user does not see them:
class democlass:
classvar = 24
def __init__(self, var):
self.instancevar1 = var
self.instancevar2 = 42
def whoreferencesmylocalvars(self, fromwhere):
return {__l__: {__g__
for __g__ in fromwhere
...
What is __pycache__?
... it to bytecode first (this is an oversimplification) and stores it in the __pycache__ folder. If you look in there you will find a bunch of files sharing the names of the .py files in your project's folder, only their extensions will be either .pyc or .pyo. These are bytecode-compiled and optimized...
How to get the input from the Tkinter Text Widget?
...more attributes to the normal .get() function. If we have a text box myText_Box, then this is the method for retrieving its input.
def retrieve_input():
input = self.myText_Box.get("1.0",END)
The first part, "1.0" means that the input should be read from line one, character zero (ie: the very...
Or versus OrElse
...([0] object a,
[1] int32 b,
[2] bool CS$4$0000)
IL_0000: nop
IL_0001: ldnull
IL_0002: stloc.0
IL_0003: ldc.i4.3
IL_0004: stloc.1
IL_0005: ldloc.0
IL_0006: ldnull
IL_0007: ceq
IL_0009: ldloc.0
IL_000a: callvirt instance string [mscorlib]...
How to reliably open a file in the same directory as a Python script
...
I always use:
__location__ = os.path.realpath(
os.path.join(os.getcwd(), os.path.dirname(__file__)))
The join() call prepends the current working directory, but the documentation says that if some path is absolute, all other paths lef...
Why does += behave unexpectedly on lists?
...
The general answer is that += tries to call the __iadd__ special method, and if that isn't available it tries to use __add__ instead. So the issue is with the difference between these special methods.
The __iadd__ special method is for an in-place addition, that is it mut...