On Thursday, July 21, 2016 at 10:05:02 AM UTC+2, Sergi Almacellas Abellana
wrote:
>
> El 20/07/16 a les 17:11, Marko Randjelovic ha escrit:
> > Let us look at pyson expresson:
> >
> > If(~Eval('end_date', None)
> >
> > What is ~? Experimenting with Python interpreter, ~True is -2 and ~False
> > is -1. I thought ~ is for negation, but -1 and -2 are not boolean values
> > even in C they are 0 or >0.
>
> In python ~ is the shourcut of Bitwise Inversion [1].
> In PySON is the shourtcut of the Not operator: So your statement means:
>
> > If(Not(Eval('end_date', None))
>
> Which I think you will understand :)
>
Of course, but in examples I have neither ~ nor Not is imported from
trytond.pyson. How Python knows about new character of '~'? Also, how is
achieved possible to use ~ as an operator (there are no parenthesis)?
>
> [1]
>
> https://docs.python.org/2/library/operator.html#mapping-operators-to-functions
>
> --
> Sergi Almacellas Abellana
> www.koolpi.com
> Twitter: @pokoli_srk
>
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