[Python-ideas] PEP 484 (Type Hints) -- second draft

[Cameron Simpson]

On 23Mar2015 04:55, Terry Reedy <tjreedy at udel.edu> wrote:
>On 3/23/2015 2:02 AM, David Foster wrote:
>>* It's a bit vague how local variables should be typed in the presence of
>>   multiple assignments. Consider:
>>
>>   ```
>>   if x > 0:
>>       root = sqrt(x)  # type: int
>>   else:
>>       root = None
>>   ```
>
>root = sqrt(x) if x > 0 or None  # type: Union(int, None)

Should people need to reshape their code for this?
In the example above it is small, though less readable already.

But it scales very badly; what of a 4 way if etc? It moves from a bit less 
readable to a nightmare.

Cheers,
Cameron Simpson <cs at zip.com.au>

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