Hi Paul,

I would be fine with a new division operator or fraction literal as well, and 
in the beginning this is what I actually wanted to propose.

But then I started prototyping, and given that it is not so easy to change the 
parser, I just changed the normal division operator. And interestingly, nearly 
nothing broke.

The biggest compatibility problem I actually experienced was the completely 
unrelated breaking of PyCode_New in recent commits of CPython, which made using 
cython and thus numpy impossible. That was so hard to tackle I actually gave up 
and simply branched of an older version of CPython. What I want to say with 
that is: we are happily breaking compatibility for more minor stuff. I think my 
proposal would be a major improvement, which would warrant breaking of 
compatiblity, especially because this break of compatibility is astonishingly 
small. As said above, I already installed unmodified numpy, sympy, cython and 
all their tool chains.

Cheers

Martin
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