Python 练习册，每天一个小程序，第 0001 题

import random
import string
str=string.ascii_uppercase+string.digits
def getKey(length):
    key=''
    for i in range(0,int(length)):
        key+=random.choice(str)
    return key
def main():
    length=input('please input length of key')
    number=input('please input number of key')
    keys=[]
    for i in range(0,int(number)):
        key=getKey(length)
        if not key in keys:
            keys.append(key)
        else:
            i-=1
    path='temp/keys.txt'
    with open(path,'w') as file:
        for item in keys:
            file.write(item+'\n')
main()