写一个函数，输入一个数，随机生成N条邮箱

写一个函数，这个函数的功能是，传入一个数字，产生N条邮箱，产生的手机号不能重复。
邮箱前面的长度是6 - 12
之间，产生的邮箱必须包含大写字母、小写字母、数字和特殊字符

import random                                                                                             
import string                                                                                             
def email2(count):                                                                                        
    emails = set()                                                                                        
    while len(emails)!=count:                                                                             
        email_len = random.randint(6,12)                                                                  
        email_end = (\'@163.com\', \'@qq.com\', \'@sina.com\', \'@126.com\')                                      
        end = random.choice(email_end)                                                                    
        res = random.sample(string.ascii_letters+string.digits+string.punctuation,email_len)              
        if set(res) & set(string.ascii_lowercase) and \                                                   
            set(res) & set(string.ascii_uppercase) and \                                                  
            set(res) & set(string.digits) and \                                                           
            set(res) & set(string.punctuation):                                                           
            email = \'\'.join(res)+end+\'\n\'                                                                 
            emails.add(email)                                                                             
    with open(\'email.txt\',\'w\') as fw:                                                                     
        fw.writelines(emails)                                                                             
email2(50)