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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Thu, 5 Jun 2014 14:18:49 -0600
Subject: Re: Unicode and Python - how often do you index strings?
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On Thu, Jun 5, 2014 at 1:58 PM, Paul Rubin <no.email@nospam.invalid> wrote:
> Ryan Hiebert <ryan@ryanhiebert.com> writes:
>> How so? I was using line=line[:-1] for removing the trailing newline, and
>> just replaced it with rstrip('\n'). What are you doing differently?
>
> rstrip removes all the newlines off the end, whether there are zero or
> multiple.  In perl the difference is chomp vs chop.  line=line[:-1]
> removes one character, that might or might not be a newline.

Given the description that the input string is "a textfile line", if
it has multiple newlines then it's invalid.

Personally I tend toward rstrip('\r\n') so that I don't have to worry
about files with alternative line terminators.

If you want to be really picky about removing exactly one line
terminator, then this captures all the relatively modern variations:
re.sub('\r?\n$|\n?\r$', line, '', count=1)