[Python-ideas] PEP 479: Change StopIteration handling inside generators

[Serhiy Storchaka]

On 18.11.14 06:50, Guido van Rossum wrote:
> Separate from this special case, I am also worried about backward
> compatibility, and I have yet to get a good idea for how widespread code
> is that depends on StopIteration bubbling out from generators. I also
> don't have a good idea how often this issue bites users, but I have a
> feeling it does bite.

E.g. current difflib implementation depends on this behavior.

     ...
     while True:
         ...
         while(found_diff is False):
             from_line, to_line, found_diff = next(line_pair_iterator)
             ...