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What's a correct and good way to implement __hash__()?
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An easy, correct way to implement __hash__() is to use a key tuple. It won't be as fast as a specialized hash, but if you need that then you should probably implement the type in C.
Here's an example of using a key for hash and equality:
class A:
def __key(self):
return (self.at...
What does functools.wraps do?
... was doing. So, I'm asking this question so that there will be a record of it on StackOverflow for future reference: what does functools.wraps do, exactly?
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Defining private module functions in python
...acy" depends on "consenting adults'" levels of agreement - you can't force it (any more than you can in real life;-). A single leading underscore means you're not supposed to access it "from the outside" -- two leading underscores (w/o trailing underscores) carry the message even more forcefully......
Byte order mark screws up file reading in Java
... the beginning, but not all. When present, the byte order gets read along with the rest of the first line, thus causing problems with string compares.
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What is __init__.py for?
What is __init__.py for in a Python source directory?
12 Answers
12
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How to make a class property? [duplicate]
In python I can add a method to a class with the @classmethod decorator. Is there a similar decorator to add a property to a class? I can better show what I'm talking about.
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C++ mark as deprecated
I have a method in an interface that I want to deprecate with portable C++.
When I Googled for this all I got was a Microsoft specific solution; #pragma deprecated and __declspec(deprecated) .
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Catching an exception while using a Python 'with' statement
To my shame, I can't figure out how to handle exception for python 'with' statement. If I have a code:
4 Answers
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Standard way to embed version into python package?
Is there a standard way to associate version string with a python package in such way that I could do the following?
17 Ans...
How to avoid having class data shared among instances?
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You want this:
class a:
def __init__(self):
self.list = []
Declaring the variables inside the class declaration makes them "class" members and not instance members. Declaring them inside the __init__ method makes sure that a new instance of the me...