需求分析：
1 将固定的号码段放到list中 如：136 137 180 183等等
2 随机取8个数字元素
3 将固定号码段与随机产生的元素拼接在一起
4 写入文件
import string
def phone_num(num):
all_phone_nums=set()
num_start = ['134', '135', '136', '137', '138', '139', '150', '151', '152', '158', '159', '157', '182', '187', '188',
'147', '130', '131', '132', '155', '156', '185', '186', '133', '153', '180', '189']
for i in range(num):
start = random.choice(num_start)
end = ''.join(random.sample(string.digits,8))
res = start+end+'
'
all_phone_nums.add(res)
with open('phone_num.txt','w',encoding='utf-8') as fw:
fw.writelines(all_phone_nums)
phone_num(1000)