初学者真不会啊！怎么办啊

字符串中间怎么加连接符
循环结果输出换行怎么搞
for和while应该可以互相嵌套的吧

import random

n = int(input())
lib = list(range(48,58))+list(range(65,91))+list(range(97,123))

pwd=[]
for i in range(n):
    single_pwd = []
    for j in range(4):
        single_pwd.append(''.join(map(chr,random.choices(lib, k=6))))
    pwd.append('-'.join(single_pwd))

for i in pwd:
    print(i)

with open('key.txt','w') as f:
    f.write('\n'.join(pwd))