PyCon 2011 - Hidden Treasures of the Python Standard Library - 词法分析器分析命令行参数

本作品采用知识共享署名-非商业性使用-相同方式共享 3.0 Unported许可协议进行许可。允许非商业转载，但应注明作者及出处。

作者：liuyuan_jq

2011-03-30

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完整源码

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#!/usr/bin/env python
# encoding: utf-8
# shlex_split.py
"""Splitting a command line into arguments.
"""
import shlex
for cmd in [ 
    r'''ls "hidden stdlib" "\"already quoted\"" "with ' embedded"''',  # subprocess
    """ls 'hidden stdlib' '"already quoted"' 'with '"'"' embedded'""", # pipes
    ]:
    print cmd
    print cmd.split(' ')
    print shlex.split(cmd)
    print

运行结果

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''ls "hidden stdlib" "\"already quoted\"" "with ' embedded"
["''ls", '"hidden', 'stdlib"', '"\\"already', 'quoted\\""', '"with', "'", 'embedded"']
['ls', 'hidden stdlib', '"already quoted"', "with ' embedded"]
ls 'hidden stdlib' '"already quoted"' 'with '"'"' embedded'
['ls', "'hidden", "stdlib'", '\'"already', 'quoted"\'', "'with", '\'"\'"\'', "embedded'"]
['ls', 'hidden stdlib', '"already quoted"', "with ' embedded"]