__init__.py 文件源码

def check_path(path, ptype=None, access=None):
    """Checks that a path exists, is of the specified type, and allows the
    specified access.

    Args:
        ptype: 'f' for file or 'd' for directory.
        access (int): One of the access values from :module:`os`

    Raises:
        IOError if the path does not exist, is not of the specified type, or
        doesn't allow the specified access.
    """
    if (
            ptype == 'f' and not path.startswith("/dev/") and
            not os.path.isfile(path)):
        raise IOError(errno.EISDIR, "{} is not a file".format(path), path)
    elif ptype == 'd' and not os.path.isdir(path):
        raise IOError(errno.ENOTDIR, "{} is not a directory".format(path), path)
    elif not os.path.exists(path):
        raise IOError(errno.ENOENT, "{} does not exist".format(path), path)
    if access is not None and not os.access(path, access):
        raise IOError(errno.EACCES, "{} is not accessable".format(path), path)
    return path