Function repl

Lib/posixpath.py:317–331

(m)

        environ = os.environ

    def repl(m):
        name = m[1]
        if name.startswith(start):
            if not name.endswith(end):
                return m[0]
            name = name[1:-1]
        try:
            if environ is None:
                value = os.fsencode(os.environ[os.fsdecode(name)])
            else:
                value = environ[name]
        except KeyError:
            return m[0]
        else:
            return value

    return sub(repl, path)