_environ.py 文件源码

def unsetenv(key):
    """Like `os.unsetenv` but takes unicode under Windows + Python 2

    Args:
        key (pathlike): The env var to unset
    """

    key = path2fsn(key)
    if is_win:
        # python 3 has no unsetenv under Windows -> use our ctypes one as well
        try:
            del_windows_env_var(key)
        except WindowsError:
            pass
    else:
        os.unsetenv(key)