I went through python 2x and 3x docs. It only mentions the following -
The Python interpreter has a number of functions and types built into it that are always available.
How and where are these built-in methods free floating?
Python is not object oriented based,it can also be functional.However if you want to look for the functions and their methods you can type in the interpreter
>>>dir(__builtins__)
This gets a list of built-in functions and variables in the directory,also you can use work around by typing
>>>help('module')
or
>>help(function-name)