How are internal standard libraries implemented and integrated in Python?

In Python, the internal standard libraries are implemented as a set of modules written in Python itself and in C (to improve performance). They are shipped with the interpreter and are available for import without additional installation.

The standard library includes modules that implement various functions: working with files, network protocols, regular expressions, multithreading, and much more.

Python modules are usually stored in the Lib directory, while C modules are in the form of compiled extensions (.so, .pyd), which are loaded dynamically.

Example of importing a standard module:

import os
print(os.listdir('.'))

Thus, the standard library is a collection of modules integrated into the Python distribution, providing rich functionality out of the box.