[Tutor] Comparing two different text file

[Marc Tompkins]

On Tue, Jul 29, 2014 at 4:13 PM, 이명교 <toll at naver.com> wrote:

> inf1 = open('first.txt')
> for line in inf1.readlines():
>     list1.append(line)
So far, so good...

>     list1 = line[:-1].split('\n')
...but then you do this, which wipes out list1.


> for a in list1:
>     if a not in list1:

Even if you hadn't already wiped out list1, this would be a problem.
These two lines essentially say "if a is both in AND not in list1..."

There might be other issues, but fixing those will get you started.

Also:  don't be afraid to add print() all over the place so you can
see what's happening!