问Python如何检查缩进错误？

EN

import itertools
import string

file = open('list.txt', 'w')

def guess_password(real):
    chars = string.ascii_lowercase + string.digits
    attempts = 0
    for password_length in range(1, 9):
        for guess in itertools.product(chars, repeat=password_length):
            attempts += 1
            guess = ''.join(guess)
            if guess == real:
                return 'password is {}. found in {} guesses.'.format(guess, attempts)
            print(guess)
            file.write(guess + attempts # Unexpected indent error... WHY?!

print(guess_password('your password'))
command = input("()")