What is a mapping object, according to dict type?

Question

The documentation lists 3 ways for creating a dict instance:

class dict(**kwarg)
class dict(mapping, **kwarg)
class dict(iterable, **kwarg)

Answer 1

It's the best answer for your question:

https://docs.python.org/2/library/stdtypes.html#typesmapping

It's the simplest example of mapping: {}

If you want to create a custom mapping type, you may inherit it from base dict and overwrite __getitem__ magic method(it depends on your needs)