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Multiply Tuple with IntExpr #863

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ecprice opened this issue Aug 29, 2015 · 3 comments · Fixed by #10361
Closed

Multiply Tuple with IntExpr #863

ecprice opened this issue Aug 29, 2015 · 3 comments · Fixed by #10361
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false-positive mypy gave an error on correct code feature priority-2-low

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@ecprice
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ecprice commented Aug 29, 2015

(1,)*3 should be of type Tuple[int,int,int], not raise an exception.

I suppose (1,)*n may as well wait for proper tuple sequences, though.

@JukkaL JukkaL added the feature label Aug 29, 2015
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JukkaL commented Aug 29, 2015

Yeah, mypy should support this. It doesn't raise an exception fpr me, however, but gives an error (Unsupported operand types for * ("Tuple[int]" and "int")).

And yes, the general case should probably wait for variable-length tuples (#184) and we should use them. However, using Sequence[t] would be okay in the interim if somebody implements this.

JukkaL added a commit that referenced this issue Aug 31, 2015
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JukkaL commented Aug 31, 2015

Okay, the (1,) * n case is implemented now, and it results in Tuple[int, ...] (with literal ...).

JamesGuthrie pushed a commit to JamesGuthrie/mypy that referenced this issue Sep 15, 2015
@JukkaL JukkaL added the easy label Jun 3, 2016
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JukkaL commented May 18, 2018

(1, '') * 2 (a fixed-length tuple is multiplied by an interger literal) still produces a too general type (Tuple[object, ...]).

@JukkaL JukkaL added priority-2-low false-positive mypy gave an error on correct code labels May 18, 2018
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