As well as the while statement just introduced, Python uses a few more that we will encounter in this chapter. if Statements: Perhaps the most well-known statement type is the if statement. For exa...

Initializing C modules: Modules objects are usually created from extension modules (shared libraries which export an initialization function), or compiled-in modules (where the initialization funct...

Source code: Lib/email/charset.py This module is part of the legacy ( Compat32) email API. In the new API only the aliases table is used. The remaining text in this section is the original document...

Source code: Lib/csv.py The so-called CSV (Comma Separated Values) format is the most common import and export format for spreadsheets and databases. CSV format was used for many years prior to att...

Source code: Lib/gzip.py This module provides a simple interface to compress and decompress files just like the GNU programs gzip and gunzip would. The data compression is provided by the zlib modu...

The main direction for asyncio extending is writing custom event loop classes. Asyncio has helpers that could be used to simplify this task. Writing a Custom Event Loop: asyncio.AbstractEventLoop d...

Source code: Lib/email/headerregistry.py Headers are represented by customized subclasses of str. The particular class used to represent a given header is determined by the header_factory of the po...

Source code: Lib/mailbox.py This module defines two classes, Mailbox and Message, for accessing and manipulating on-disk mailboxes and the messages they contain. Mailbox offers a dictionary-like ma...

Source code: Lib/io.py Overview: The io module provides Python’s main facilities for dealing with various types of I/O. There are three main types of I/O: text I/O, binary I/O and raw I/O. These ar...

Build Requirements: Features required to build CPython: A C11 compiler. Optional C11 features are not required., Support for IEEE 754 floating point numbers and floating point Not-a-Number (NaN)., ...