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From: Peter Otten <__peter__@web.de>
Newsgroups: comp.lang.python
Subject: Re: new to python, help please !!
Date: Thu, 12 Nov 2015 16:41:33 +0100
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Xref: csiph.com comp.lang.python:98701

Tim Chase wrote:

> On 2015-11-12 15:56, Peter Otten wrote:
>> Tim Chase wrote:
>> 
>> >   with open("file1.md5") as a, open("file2.md5") as b:
>> >     for s1, s2 in zip(a, b):
>> >       if s1 != s2:
>> >         print("Files differ")
>> 
>> Note that this will not detect extra lines in one of the files.
>> I recommend that you use itertools.zip_longest (izip_longest in
>> Python 2) instead of the built-in zip().
> 
> Yeah, I noticed that after pushing <send> but then posted a later
> version that just read chunks of the file which should catch that
> file-size difference.  Or, as in that other message, prefix it with
> an fstat() check to compare file-sizes so that you don't even have to
> open the files if the sizes differ.
> 
> -tkc

>>> os.path.getsize("file1.md5")
10
>>> os.path.getsize("file2.md5")
10
>>> with open("file1.md5") as a, open("file2.md5") as b:
...     for s, t in zip(a, b):
...         if s != t: print("different")
... 
>>> from itertools import zip_longest
>>> with open("file1.md5") as a, open("file2.md5") as b:
...     for s, t in zip_longest(a, b):
...         if s != t: print("different")
... 
different

I admit I cheated and used Python 3 ;)