Python穷举法生成手机号

Python使用穷举法生成三大运营商的所有手机号码

import itertools as its
#定义手机号码段
num_start = ['133','149','153','170','173','177','180','181','189','199',  #电信号码段
             '130','131','132','145','155','156','166','171','175','176','185','186','166', #  联通号码段
             '134','135','136','137','138','139','147','150','151','152','157','158','159','172','178','182','183','184','187','188','198'] #移动号码段
#定义写入函数
def writer(data):
    with open('phone_num.txt','a',encoding='utf-8') as f:
        f.write(data)
def main():
    words = '1234567890'   #定义数字
    r = its.product(words,repeat=8) #穷举生成8位数字
    for i in r:
        a = ''.join(i)
        for phone in num_start:
            phone_num = phone + a   #号码段+穷举数字生成手机号码
            print(phone_num)
            writer(phone_num + '\n')    #写入文件
if __name__ == '__main__':
    main()
    print('全部手机号生成')

需要的时间有点久，可以添加多线程生成！！！！