python生成字典文件

代码如下：
import itertools
import time

items = '1234567890'
password = itertools.product(items, repeat=6)
start = time.time()
with open('password6.txt', 'w', encoding='utf8') as f:
    for i, j in enumerate(password):
        print(f'产生第{i+1}个密码')
        f.write(''.join(j))
        f.write(''.join('\n'))
end = time.time()
delta = end - start
print(delta)