June 2019
Beginner to intermediate
770 pages
19h 24m
English
Content preview from Mastering Object-Oriented Python - Second Edition
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The comparison operator methods
Python has six comparison operators. These operators have special method implementations. According to the documentation, mapping works as follows:
- x<y is implemented by x.__lt__(y).
- x<=y is implemented by x.__le__(y).
- x==y is implemented by x.__eq__(y).
- x!=y is implemented by x.__ne__(y).
- x>y is implemented by x.__gt__(y).
- x>=y is implemented by x.__ge__(y).
We'll return to comparison operators again when looking at numbers in Chapter 8, Creating Numbers.
There's an additional rule regarding what operators are actually implemented that's relevant here. These rules are based on the idea that the object's class on the left-hand side of an operator defines the required special method. If it doesn't, Python ...
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