Command Line Interface Libraries
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The modules described in this chapter assist with implementing command
line and terminal interfaces for applications.

Here's an overview:

* "argparse" --- Parser for command-line options, arguments and
  subcommands

* "optparse" --- Parser for command line options

* "getpass" --- Portable password input

* "fileinput" --- Iterate over lines from multiple input streams

* "curses" --- Terminal handling for character-cell displays

* "curses.textpad" --- curses 프로그램을 위한 텍스트 입력 위젯

* "curses.ascii" --- ASCII 문자용 유틸리티

* "curses.panel" --- curses 용 패널 스택 확장
