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List:       pykde
Subject:    Re: [PyQt] Floats being accepted for int arguments
From:       Phil Thompson <phil () riverbankcomputing ! com>
Date:       2018-11-27 10:15:08
Message-ID: C4C4BB86-E8EB-489B-B71F-9562139BF5D1 () riverbankcomputing ! com
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On 27 Nov 2018, at 9:51 am, Florian Bruhin <me@the-compiler.org> wrote:
> 
> Hi,
> 
> turns out running mypy on a big PyQt codebase results in some things to
> talk about :D
> 
> Apparently, PyQt accepts floats where C++ takes ints and silently
> truncates them:
> 
>>>> from PyQt5.QtGui import QFont
>>>> f = QFont()
>>>> f.setWeight(5.8)
>>>> f.weight()
>  5
> 
> Similar Python methods usually accept floats if f.is_integer() is true,
> but raise a ValueError otherwise:

I disagree with "usually".

>>>> import math
>>>> math.factorial(5)
>  120
>>>> math.factorial(5.0)
>  120
>>>> math.factorial(5.5)
>  Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
>  ValueError: factorial() only accepts integral values
> 
> Is that behavior intended?

It calls PyLong_AsLongLong(), so yes.

Phil
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