dict

>>> dir(dict)
['__class__', '__class_getitem__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__ior__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__or__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__ror__', '__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'clear', 'copy', 'fromkeys', 'get', 'items', 'keys', 'pop', 'popitem', 'setdefault', 'update', 'values']

Dunder methods

Dunder Method	Operation	Example (normal syntax)	Example (dunder call)
__getitem__	Access value	d["a"] → 1	d.__getitem__("a")
__setitem__	Set key/value	d["b"] = 2	d.__setitem__("b", 2)
__delitem__	Delete key	del d["a"]	d.__delitem__("a")
__contains__	Membership	"a" in d	d.__contains__("a")
__len__	Length	len(d)	d.__len__()
__iter__	Iterate keys	for k in d	it = d.__iter__(); next(it)
__eq__	Equality	{"a":1} == {"a":1}	{"a":1}.__eq__({"a":1})