Python从两个文件中读取嵌套for循环中的行

Question

我想逐行匹配一个文本文件的行和另一个文本文件，我的嵌套for循环有问题，一定很简单，但我找不到，

for line1 in ratings:
    cont1+=1

    for line2 in movies:
         cont2+=1
         print(cont1,cont2)

我用这个循环简化了它，以检查错误，外层循环没有到达cont=2，

1 1
1 2
1 3
1 4
1 5
1 6
1 7
.
.
.
1 157
>>>

Answer 1

你需要同时遍历两个文件

ratings= open('ratings.txt')
movies= open('movies.txt')

for rating, movie in itertools.izip(ratings, movies):
    # do task

或

ratings= open('ratings.txt').readlines()
movies= open('movies.txt').readlines()

for rating, movie in zip(ratings, movies):
    # do task