The Python library consists of three parts, with different levels of integration with the interpreter. Closest to the interpreter are built-in types, exceptions and functions. Next are built-in modules, which are written in and linked statically with the interpreter. Finally there are standard modules that are implemented entirely in Python, but are always available. For efficiency, some standard modules may become built-in modules in future versions of the interpreter. built-intypes built-inexceptions built-infunctions built-inmodules standardmodules language