The modules described in this chapter provide interfaces to features that are unique to the Unix operating system, or in some cases to some or many variants of it. Here’s an overview:
shlex — Simple lexical analysis
posix — The most common POSIX system calls
pwd — The password databasegrp — The group databasetermios — POSIX style tty control
tty — Terminal control functionspty — Pseudo-terminal utilities
fcntl — The fcntl and ioctl system callsresource — Resource usage information
syslog — Unix syslog library routines