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Accessing class variables from a list comprehension in the class definition
How do you access other class variables from a list comprehension within the class definition? The following works in Python 2 but fails in Python 3:
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Object of custom type as dictionary key
...d to add 2 methods, note __hash__ and __eq__:
class MyThing:
def __init__(self,name,location,length):
self.name = name
self.location = location
self.length = length
def __hash__(self):
return hash((self.name, self.location))
def __eq__(self, other):
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Bidirectional 1 to 1 Dictionary in C#
...h value and key (up to RefEquals anyway), and which can be searched using either key or value. Anyone know of one, or should I just implement it myself? I can't believe that I'm the first person to need this...
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Django “xxxxxx Object” display customization in admin action sidebar
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edited May 17 '16 at 7:06
answered Feb 17 '12 at 22:54
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Finding the source code for built-in Python functions?
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edited Nov 19 '17 at 4:11
Rob Rose
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answe...
Define a lambda expression that raises an Exception
How can I write a lambda expression that's equivalent to:
6 Answers
6
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What is the purpose of the single underscore “_” variable in Python?
...y the standard CPython
interpreter, and other interpreters have followed suit
As a general purpose "throwaway" variable name to indicate that part
of a function result is being deliberately ignored (Conceptually, it is being discarded.), as in code like:
label, has_label, _ = text.partition(':').
As...
How to import a Python class that is in a directory above?
I want to inherit from a class in a file that lies in a directory above the current one.
7 Answers
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Should I use a class or dictionary?
...age? What happens if you later want to add some code? Where would your __init__ code go?
Classes are for bundling related data (and usually code).
Dictionaries are for storing key-value relationships, where usually the keys are all of the same type, and all the values are also of one type. Occasio...
What does __FILE__ mean in Ruby?
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It is a reference to the current file name. In the file foo.rb, __FILE__ would be interpreted as "foo.rb".
Edit: Ruby 1.9.2 and 1.9.3 appear to behave a little differently from what Luke Bayes said in his comment. With these...