day6_随机生成11位手机号的程序

#需求分析：
#1、前三位确定，可以定义一个list，如lis = [‘131‘, ‘132‘, ‘133‘, ‘134‘, ‘135‘,‘136‘,‘137‘,‘138‘,‘139‘,‘158‘, ‘159‘, ‘185‘, ‘186‘, ‘188‘]
#2、后面的八位随机取，通过random.sample(str,8)

用list添加手机号：

def phone_num(num):
    import random,string
    all_nums = []
    for i in range(num):
        lis = [‘131‘, ‘132‘, ‘133‘, ‘134‘, ‘135‘, ‘158‘, ‘159‘, ‘185‘, ‘186‘, ‘188‘]
        start = random.choice(lis)
        end = ‘‘.join(random.sample(string.digits, 8))
        res = start + end + ‘\n‘
        if res not in all_nums:
            all_nums.append(res)
        with open(‘telephone.txt‘, ‘w‘, encoding=‘utf8‘) as fw:
            fw.writelines(all_nums)
phone_num(10)

用集合添加手机号：

def phone_num(num):

    import random,string
    all_phone_nums = set()
    num_start = [‘134‘, ‘135‘, ‘136‘, ‘137‘, ‘138‘, ‘139‘, ‘150‘, ‘151‘, ‘152‘, ‘158‘, ‘159‘, ‘157‘]
    for i in range(num):
        start = random.choice(num_start)
        end = ‘‘.join(random.sample(string.digits,8))
        res = start + end + ‘\n‘
        all_phone_nums.add(res)
    with open(‘phone.txt‘,‘w‘,encoding = ‘utf8‘) as fw:
        fw.writelines(all_phone_nums)
phone_num(20)