python随机生成域名

#!/usr/bin/env python
# _*_ coding=utf-8 _*_
start = 1
import random
name = ".com"
while True:
    chart = 'qwertyuioplkjhgfdsazxcvbnm'
    last = len(chart) - 1
    str = ''
    for i in range(5):   ####指定随机生成的格式长度范围
        str += chart[random.randint(1,last)]
        if len(str) == 5:  ###指定要生成格式的长度
            print ("www."+ str + name)
    if start < 6:      ####设置要生成的个数
        start += 1
    else:
        break