生成随机字符串算法

import random
def get_random_str():
    str_set="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
    rand_str = ‘‘
    for i in range(0, 31):    # 通过这里控制字符串的长度
        number=random.randint(0, 61)
        rand_str += str_set[number]
    return rand_str
    
if __name__ == "__main__":
    print(get_random_str())#0FwDEGUb9Hc8XUbsYHxKVJZd3Az6piO