parameters.py 文件源码

def _uniqueid(n=30):
    """Return a unique string with length n.

    :parameter int N: number of character in the uniqueid
    :return: the uniqueid
    :rtype: str
    """
    return ''.join(random.SystemRandom().choice(
                   string.ascii_uppercase + string.ascii_lowercase)
                   for _ in range(n))