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How can you set class attributes from variable arguments (kwargs) in python
...pdate the __dict__ attribute (which represents the class attributes in the form of a dictionary) with the keyword arguments:
class Bar(object):
def __init__(self, **kwargs):
self.__dict__.update(kwargs)
then you can:
>>> bar = Bar(a=1, b=2)
>>> bar.a
1
and with so...
Ruby send vs __send__
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Some classes (for example the standard library's socket class) define their own send method which has nothing to do with Object#send. So if you want to work with objects of any class, you need to use __send__ to be on the safe side.
Now t...
Python extending with - using super() Python 3 vs Python 2
...anted to ask this question , but then I found it was already thought of before...
5 Answers
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Get name of current script in Python
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At least for Python 2.7, I believe an import os is required for this to work. I'd add this into the answer.
– Nick Chammas
Feb 1 '14 at 1:07
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UML class diagram enum
...tribute to be of type Integer. If your modeling tool has explicit support for enumerations, you should use that and only use the Class + <<enumeration>> stereotype notation as a fallback if necessary.
– Tom Morris
Feb 2 '12 at 17:11
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Usage of __slots__?
...you should only declare a particular slot one time in an inheritance tree. For example:
class Base:
__slots__ = 'foo', 'bar'
class Right(Base):
__slots__ = 'baz',
class Wrong(Base):
__slots__ = 'foo', 'bar', 'baz' # redundant foo and bar
Python doesn't object when you get this...
Understanding the difference between __getattr__ and __getattribute__
... more control (when we do not know the name of the attribute in advance).
For example, instance.attribute would become getattr(instance, attribute_name). Using this model, we can get the attribute by supplying the attribute_name as a string.
Use of __getattr__
You can also tell a class how to de...
How do you calculate the average of a set of circular data? [closed]
I want to calculate the average of a set of circular data. For example, I might have several samples from the reading of a compass. The problem of course is how to deal with the wraparound. The same algorithm might be useful for a clockface.
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Get a filtered list of files in a directory
..., rather than special operating system calls to do the wildcard filtering. For example, on Windows the FindFirstFile API allows you to specify wildcards so the OS does the filtering directly, and presumably more efficiently (I don't think there's an equivalent on Linux).
– Ben ...
what does the __file__ variable mean/do?
... usually just hard-wire these with the actual path. But there is a reason for these statements that determine path at runtime, and I would really like to understand the os.path module so that I can start using it.
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