Magic Methods

Magic methods (formally known as special methods) are:

[...] called implicitly by Python to execute a certain operation on a type, such as addition. Such methods have names starting and ending with double underscores.

— Glossary – Python 3 documentation

5 line example:

>>> class MyObj:
...     def __add__(self, other):
...         print(self, other)  # return something sensible
...
>>> MyObj() + 42
<__main__.MyObj object at 0x7f3637f8ea90> 42

Links

• Slides
  • PyCon Ireland 2019
  • ChiPy 2018
• Notebook

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