python错误：ValueError: Sample larger than population or is negative

生成指定长度的字符串：
def getRandomSet(self, bits):
    """
    获取随机字符串
    :param bits: 长度
    :return: 字符串
    """
    num_set = [chr(i) for i in range(48, 58)]
    char_set = [chr(i) for i in range(97, 123)]
    total_set = num_set + char_set
    value_set = "".join(random.sample(total_set, bits))
    return value_set

if __name__ == '__main__':
    a = getRandomSet(50)
    print(a)

错误：

raise ValueError("Sample larger than population or is negative")
ValueError: Sample larger than population or is negative

 

random文件中:

def sample(self, population, k)

因为使用random.sample()方式时,population这个参数的长度必须大于k，如果小于k，那么就会提示ValueError: sample larger than population

 

解决：

def getRandomSet(self, bits):
    """
    获取随机字符串
    :param bits: 长度
    :return: 字符串
    """
    num_set = [chr(i) for i in range(48, 58)]
    char_set = [chr(i) for i in range(97, 123)]
    total_set = num_set + char_set
    value_set = "".join(random.sample(total_set, bits))
    return value_set

if __name__ == '__main__':
    a = getRandomSet(20)
    print(a)

结果：w492lm7tp8gnqfr3zdy1