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random.randint(0, 10)

def (**kwargs):
    """
        获取指定长度的随机数字
    """
    if not kwargs:
        return '0'
    if 'length' in kwargs and kwargs['length']:
        length = int(kwargs['length'])
        if length <= 0 or length > 50:
            return '0'
        range_start = 10 ** (length - 1)
        range_end = (10 ** length) - 1
        return str(random.randint(range_start, range_end))
    if 'start' in kwargs and 'end' in kwargs:
        if kwargs['start'] and kwargs['end']:
            return random.randint(int(kwargs['start']), int(kwargs['end']))
    return '0'

''.join(random.choices(string.ascii_uppercase + string.digits, k=6))