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" --- 用于命令行选项、参数和子命令的解析器

* "optparse" --- 命令行选项的解析器

* "getpass" --- 可移植的密码输入

* "fileinput" --- 迭代来自多个输入流的行

* "curses" --- 字符单元显示的终端处理

* "curses.textpad" --- 用于 curses 程序的文本输入控件

* "curses.ascii" --- 用于 ASCII 字符的工具

* "curses.panel" --- 针对 curses 的面板栈扩展
