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nick-w-nick
39ba5cfdd6 Merge 295fe153ad into 1c4e37ed8a 2024-11-11 21:25:19 -05:00
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For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
_1505 TILs and counting..._
_1504 TILs and counting..._
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- [Access Instance Variables](python/access-instance-variables.md)
- [Create A Dummy DataFrame In Pandas](python/create-a-dummy-dataframe-in-pandas.md)
- [Dunder Methods](python/dunder-methods.md)
- [Store And Access Immutable Data In A Tuple](python/store-and-access-immutable-data-in-a-tuple.md)
- [Test A Function With Pytest](python/test-a-function-with-pytest.md)
- [Use pipx To Install End User Apps](python/use-pipx-to-install-end-user-apps.md)

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# Dunder Methods
Python has all kinds of special, or rather, _magic_ methods that allow for
customizing all kinds of class behavior. There is `__init__()`, `__bool__()`,
and so many others.
The thing they all have in common is that their names are wrapped in _double
underscores_. This is why they are called _dunder methods_.
Some of these are used every single day, like the `__init__()` method for
defining how a class should create an object. Others, used from time to time,
are for overriding how comparisons or conversions happen. E.g. you may want to
override `__bool__()` or `__len__()` to customize the truthiness of a custom
class.
There are so many others, ones you probably haven't even heard of. To see a
full listing, check out this [cheat sheet of every dunder
method](https://www.pythonmorsels.com/every-dunder-method/#cheat-sheet).
Note: these are not to be confused with _dunder attributes_ which are things
like `__name__`, `__file__`, and `__version__` which correspond to a value that
you can access in a specific context rather than behavior to override.