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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Sat, 24 Dec 2011 08:57:01 -0700
Subject: Re: How to check for single character change in a string?
To: tinnews@isbd.co.uk
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On Sat, Dec 24, 2011 at 8:26 AM,  <tinnews@isbd.co.uk> wrote:
> Can anyone suggest a simple/easy way to count how many characters have
> changed in a string?
>
> E.g. giving results as follows:-
>
> =A0 =A0abcdefg =A0 =A0 abcdefh =A0 =A0 =A0 =A0 1
> =A0 =A0abcdefg =A0 =A0 abcdekk =A0 =A0 =A0 =A0 2
> =A0 =A0abcdefg =A0 =A0 gfedcba =A0 =A0 =A0 =A0 6
>
>
> Note that position is significant, a character in a different position
> should not count as a match.
>
> Is there any simpler/neater way than just a for loop running through
> both strings and counting non-matching characters?

No, but the loop approach is pretty simple:

sum(a =3D=3D b for a, b in zip(str1, str2))