floyd added the comment:

Agree with the separate function (especially as the return value would change 
from float to bool).

In my experience this is one of the most often occuring use cases for difflib 
in practice.

Another reason is that it is not obvious that the user can optimize it with the 
appended version.

Some more opinions would be nice.

If this suggestion is rejected we could include a performance warning for this 
use case in the docs and/or I'll write an online code recipe which can be 
linked to.

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<http://bugs.python.org/issue24384>
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