Command-Line Interface

命令行接口

Scripts become tools. sys.argv for the raw approach, argparse for proper ones — with --help, type validation, defaults, and exit codes for free. Build a Unix wc clone.

Strict source: ATBS Appendix B + Python stdlib sys and argparse

Note: browser playgrounds can't run with real sys.argv. The function-takes-argv pattern (parse_args([...])) works everywhere.

Lessons in this chapter

1. 08.00 Worked Example

   Walkthrough: sys.argv Greeter

   例题: 命令行问候
   python-cmdline

   8 min
2. 08.01 Exercise

   Sum from argv

   命令行求和
   python-cmdline

   15 min
3. 08.02 Exercise

   argparse Basics

   argparse 入门
   python-cmdline

   20 min
4. 08.03 Exercise

   argparse Defaults

   argparse 默认值
   python-cmdline

   20 min
5. 08.04 Homework

   Homework: wc Clone

   作业: wc 克隆
   python-cmdline python-file-io python-functions

   45 min