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What does the “at” (@) symbol do in Python?
...ing at some Python code which used the @ symbol, but I have no idea what it does. I also do not know what to search for as searching Python docs or Google does not return relevant results when the @ symbol is included.
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Why do we use __init__ in Python classes?
I am having trouble understanding the Initialization of classes.
8 Answers
8
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Get the name of the currently executing method
...follow
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edited May 19 '17 at 3:47
mplewis
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How do I override __getattr__ in Python without breaking the default behavior?
...ill be called first (only works for new style classes i.e. those that inherit from object). In this case, you can preserve default behaviour like so:
class Foo(object):
def __getattribute__(self, name):
if some_predicate(name):
# ...
else:
# Default behav...
Can't pickle when using multiprocessing Pool.map()
...function to divide out work simultaneously. When I use the following code, it works fine:
12 Answers
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Multiple levels of 'collection.defaultdict' in Python
Thanks to some great folks on SO, I discovered the possibilities offered by collections.defaultdict , notably in readability and speed. I have put them to use with success.
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What are “named tuples” in Python?
...although there is a recipe for implementation in Python 2.4.
For example, it is common to represent a point as a tuple (x, y). This leads to code like the following:
pt1 = (1.0, 5.0)
pt2 = (2.5, 1.5)
from math import sqrt
line_length = sqrt((pt1[0]-pt2[0])**2 + (pt1[1]-pt2[1])**2)
Using a name...
Does python have an equivalent to Java Class.forName()?
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Reflection in python is a lot easier and far more flexible than it is in Java.
I recommend reading this tutorial
There's no direct function (that I know of) which takes a fully qualified class name and returns the class, however you have all the pieces needed to build that, and you can ...
Are PHP include paths relative to the file or the calling code?
...tion to the location of B.PHP, or to the location of A.PHP? That is, does it matter which file the include is called from, or only what the current working directory is- and what determines the current working directory?
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How do I write good/correct package __init__.py files
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__all__ is very good - it helps guide import statements without automatically importing modules
http://docs.python.org/tutorial/modules.html#importing-from-a-package
using __all__ and import * is redundant, only __all__ is needed
I think one of t...