gen_sn.py

#coding=utf-8
__author__ = 'baozi'
import random
import time
start = time.clock()

prefix = '2'
length = 16
num = 1000000

time_str = time.strftime('%m%d_%H%I', time.localtime(time.time()))
destination_file = 'sn_%s_%d_%d_%s' % (prefix, length, num, time_str)

num_char_list = range(48, 58)       # 0 - 9
lower_letter_list = range(97, 123)  # A - Z
upper_letter_list = range(65, 91)   # a - z

char_list = num_char_list + upper_letter_list   # use your char list


def gen_sn():
    remain_length = length
    remain_length -= len(prefix)
    sn = prefix
    count = 0
    while count < remain_length:
        sn += random.choice(char_list)
        count += 1
    return sn


def int_to_char_in_list(int_list):
    char_list = []
    for i in int_list:
        char_list.append(chr(i))
    return char_list


def get_multi_sn():
    all_sn = {}
    while len(all_sn) < num:
        sn = gen_sn()
        if not sn in all_sn:
            all_sn[sn] = 0
    return all_sn


def main():
    sn_list = get_multi_sn()
    sn_list_str = ''
    for i in sn_list:
        sn_list_str += i + '\n'
    des_file = open(destination_file, 'w')
    des_file.write(sn_list_str)
    des_file.close()

    use_time = time.clock() - start
    print 'Use %.3f second(s)' % use_time


char_list = int_to_char_in_list(char_list)
main()