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- #!/usr/bin/env python
- # -*- coding: utf-8 -*-
- import re
- _find_unsafe = re.compile(r'[a-zA-Z0-9_^@%+=:,./-]').search
- def quote(s):
- """Return a shell-escaped version of the string *s*."""
- if not s:
- return "''"
- if _find_unsafe(s) is None:
- return s
- # use single quotes, and put single quotes into double quotes
- # the string $'b is then quoted as '$'"'"'b'
- return "'" + s.replace("'", "'\"'\"'") + "'"
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