util.py 文件源码

def randstring(n=1, source=None):
    """Generate a random string of length 'n' from 'source'."""
    if not source:
        source = string.ascii_letters + string.digits
    if n <= 0:
        raise ValueError("Length of sequence must be greater than 0.", n)
    return ''.join(random.choices(source, k=n))