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Showing content from https://mail.python.org/pipermail/python-dev/2000-March/002942.html below:

Do we need a UserString class?

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On Wed, 29 Mar 2000, Peter Funk wrote:

> Hi!
> 
> Moshe Zadka:
> > eagerly-waiting-for-UserString.py-ly y'rs, Z.
> 
> Well, I've added the missing methods.  Unfortunately I ran out of time now and
> a 'test_userstring.py' derived from 'src/Lib/test/test_string.py' is still 
> missing.  

Great work, Peter! I really like UserString. However, I have two issues
with MutableString:

1. I tshouldn't share implementation with UserString, otherwise your
algorithm are not behaving with correct big-O properties. It should
probably use a char-array (from the array module) as the internal
representation.

2. It shouldn't share interface iwth UserString, since it doesn't have a
proper implementation with __hash__.


All in all, I probably disagree with making MutableString a subclass of
UserString. If I have time later today, I'm hoping to be able to make my
own MutableString

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