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Why is the order in dictionaries and sets arbitrary?
...t understand how looping over a dictionary or set in python is done by 'arbitrary' order.
6 Answers
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What does 'super' do in Python?
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The benefits of super() in single-inheritance are minimal -- mostly, you don't have to hard-code the name of the base class into every method that uses its parent methods.
However, it's almost impossible to use multiple-inheritance w...
String concatenation in Ruby
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You can do that in several ways:
As you shown with << but that is not the usual way
With string interpolation
source = "#{ROOT_DIR}/#{project}/App.config"
with +
source = "#{ROOT_DIR}/" + project + "/App.config"
The second method seems to be more efficient in ...
Understanding __get__ and __set__ and Python descriptors
...ly implements __get__, __set__, etc. and is then added to another class in its definition (as you did above with the Temperature class). For example:
temp=Temperature()
temp.celsius #calls celsius.__get__
Accessing the property you assigned the descriptor to (celsius in the above example) calls t...
Python read-only property
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Generally, Python programs should be written with the assumption that all users are consenting adults, and thus are responsible for using things correctly themselves. However, in the rare instance where it just does not make sense for an attribute to be settable ...
How to make an immutable object in Python?
Although I have never needed this, it just struck me that making an immutable object in Python could be slightly tricky. You can't just override __setattr__ , because then you can't even set attributes in the __init__ . Subclassing a tuple is a trick that works:
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Why is __init__() always called after __new__()?
... trying to streamline one of my classes and have introduced some functionality in the same style as the flyweight design pattern .
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Getting attributes of a class
...the inspect module. getmembers and the various tests should be helpful.
EDIT:
For example,
class MyClass(object):
a = '12'
b = '34'
def myfunc(self):
return self.a
>>> import inspect
>>> inspect.getmembers(MyClass, lambda a:not(inspect.isroutine(a)))
[('__cl...
How to override the copy/deepcopy operations for a Python object?
... , decimal.py , and fractions.py ), but I'm still not 100% sure I've got it right.
7 Answers
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How do I implement __getattribute__ without an infinite recursion error?
...ble in a class, but return all others normally. How do I accomplish this with __getattribute__ ?
6 Answers
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