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I'm working on a collection class that I want to create an __eq__ method for. It's turning out to be more nuanced than I thought it would be and I've noticed several intricacies as far as how the built-in collection classes work.
What would really help me the most is a good example. Are there any pure Python implementations of an __eq__ method either in the standard library or in any third-party libraries?
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Python automatically calls the __eq__ method of a class when you use the == operator to compare the instances of the class. By default, Python uses the is operator if you don't provide a specific implementation for the __eq__ method.
The eq() method compares each value in a DataFrame to check if it is equal to a specified value, or a value from a specified DataFrame objects, and returns a DataFrame with boolean True/False for each comparison.
Python __add__() method adds two objects and returns a new object as a resultant object in Python. The below example returns a new object, Python3.
Parts are hard. Parts should be simple delegation.
def __eq__( self, other ):
if len(self) != len(other):
# Can we continue? If so, what rule applies? Pad shorter? Truncate longer?
else:
return all( self[i] == other[i] for i in range(len(self)) )
Take a look at "collections.py". The latest version (from version control) implements an OrderedDict with an __eq__. There's also an __eq__ in sets.py
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