An overview of Python's dunder methods.
General
__init__: Constructor__str__: Overwrites the str() function__bool__: Overrides the bool() function__len__: Overrides the len() function__hash__: Overrides the hash() function, this is used in dictionaries__repr__: String representation shown in the REPL__call__: Caller function, lets you call the object like a function__enter__: Setup function for context managers, calls when entering a with block__exit__: Cleanup function for context managers, calls when exiting a with block
Indexing
__getitem__: You get an item from the object using an index__setitem__: Let's use an index to set or change an item in the object__delitem__: Lets you delete an item from the object using an index__iter__: Iterators, lets you loop over the object__next__: Next function for iterators, lets you loop over the object__contains__: Overwrites the in operator
Arithmetic
| Operator | Forwards (self ? other) | Backwards (other ? self) |
|---|
+ | __add__ | __radd__ |
- | __sub__ | __rsub__ |
* | __mul__ | __rmul__ |
/ | __truediv__ | __rtruediv__ |
// | __floordiv__ | __rfloordiv__ |
% | __mod__ | __rmod__ |
** | __pow__ | __rpow__ |
Comparison
| Comparison | Method |
|---|
== | __eq__ |
!= | __ne__ |
< | __lt__ |
<= | __le__ |
> | __gt__ |
>= | __ge__ |