imputil.py 文件源码

def _os_bootstrap():
    "Set up 'os' module replacement functions for use during import bootstrap."

    names = sys.builtin_module_names

    join = None
    if 'posix' in names:
        sep = '/'
        from posix import stat
    elif 'nt' in names:
        sep = '\\'
        from nt import stat
    elif 'dos' in names:
        sep = '\\'
        from dos import stat
    elif 'os2' in names:
        sep = '\\'
        from os2 import stat
    else:
        raise ImportError, 'no os specific module found'

    if join is None:
        def join(a, b, sep=sep):
            if a == '':
                return b
            lastchar = a[-1:]
            if lastchar == '/' or lastchar == sep:
                return a + b
            return a + sep + b

    global _os_stat
    _os_stat = stat

    global _os_path_join
    _os_path_join = join