[英]Python: How to do nested enumerate for loop?
I have two files, file1
and file2
, and for every file1
line, I'm trying to check against all the lines of file2
. 我有两个文件,
file1
和file2
,对于每个file1
行,我试图检查file2
所有行。
So I did a nested enumerate for loop, but checking the first line of file1
against all the lines of file2
, the program just completes, rather than moving onto the next file1
line to check against all the lines of file2
. 所以我做了一个嵌套的枚举for循环,但是对照
file2
所有行检查file1
的第一行,程序刚刚完成,而不是移动到下一个file1
行来检查file2
所有行。
Here is what I have: 这是我有的:
def testing():
file1 = open(‘file1.txt’, 'r')
file2 = open(‘file2.txt’, 'r')
for index1, line1 in enumerate(file1):
for index2, line2 in enumerate(file2):
# Here it prints the first line of `file1.txt` and after checking against all the lines of `file2.txt` (`for index2, line2 in enumerate(file2.txt)`) it completes, rather then going to the outer loop and proceed looping
print("THIS IS OUTER FOR LOOP LINE: " + line1 + " WITH LINE NUMBER: " + str(index1))
file1.close()
file2.close()
How can I check every line of file1
against all the lines of file2
? 如何针对
file2
所有行检查file1
每一行? What could I be doing wrong here? 我在这里做错了什么?
Thank you in advance and will be sure to upvote/accept answer 提前谢谢你,一定会upvote /接受答复
Push the position of file2 back to the start at the top of each loop. 将file2的位置推回到每个循环顶部的开头。 Either close and reopen it as aryamccarthy suggested, or do it the cleaner way by simply moving the pointer:
关闭并重新打开它作为aryamccarthy建议,或者通过简单地移动指针以更干净的方式做到:
file1 = open(‘file1.txt’, 'r')
file2 = open(‘file2.txt’, 'r')
for index1, line1 in enumerate(file1):
file2.seek(0) # Return to start of file
for index2, line2 in enumerate(file2):
You need to reopen file2
on every iteration. 您需要在每次迭代时重新打开
file2
。 Move that code inside the loop. 将该代码移到循环中。 Otherwise, you reach the end of
file2
after the first outer iteration, and you have nothing left to iterate over in the next round of the outer loop. 否则,在第一次外部迭代之后到达
file2
的末尾,并且在下一轮外循环中没有任何东西可以迭代。
I would keep every line of each file in separate lists 我会将每个文件的每一行保存在单独的列表中
with open(file1) as f:
content_1 = f.readlines()
with open(file2) as f:
content_2 = f.readline()
and then proceed to compare the lists 然后继续比较列表
for index1, line1 in enumerate(content_1):
for index2, line2 in enumerate(content_2):
# do your stuff here
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