Source code: Lib/difflib.py This module provides classes and functions for comparing sequences. It can be used for example, for comparing files, and can produce information about file differences i...

Source code: Lib/email/message.py The central class in the email package is the EmailMessage class, imported from the email.message module. It is the base class for the email object model. EmailMes...

Source code: Lib/doctest.py The doctest module searches for pieces of text that look like interactive Python sessions, and then executes those sessions to verify that they work exactly as shown. Th...

Source code: Lib/argparse.py Tutorial: This page contains the API reference information. For a more gentle introduction to Python command-line parsing, have a look at the argparse tutorial. The arg...

Source code: Lib/locale.py The locale module opens access to the POSIX locale database and functionality. The POSIX locale mechanism allows programmers to deal with certain cultural issues in an ap...

Source code: Lib/pathlib/ This module offers classes representing filesystem paths with semantics appropriate for different operating systems. Path classes are divided between pure paths, which pro...

Source code: Lib/json/__init__.py JSON (JavaScript Object Notation), specified by RFC 7159(which obsoletes RFC 4627) and by ECMA-404, is a lightweight data interchange format inspired by JavaScript...

Source code: Lib/asyncio/events.py, Lib/asyncio/base_events.py Preface The event loop is the core of every asyncio application. Event loops run asynchronous tasks and callbacks, perform network IO ...

The Application Programmer’s Interface to Python gives C and C++ programmers access to the Python interpreter at a variety of levels. The API is equally usable from C++, but for brevity it is gener...

The xml.parsers.expat module is a Python interface to the Expat non-validating XML parser. The module provides a single extension type, xmlparser, that represents the current state of an XML parser...