On Tue, 28 Oct 2014 10:41:16 -0700 (PDT)
Volker Braun <vbraun.n...@gmail.com> wrote:
> On Tuesday, October 28, 2014 5:16:47 PM UTC, Erik Massop wrote:
> >
> > class CoercingDict:
> > def __init__(self, f):
> > self.f = f
> > self.data = dict()
> > def __setitem__(self, key, value):
> > self.data[self.f(key)] = value
>
>
> Thats manual conversion, not coercion. This is:
>
> sage: s = Sequence([int(1), ZZ(2), QQ(3)])
> sage: s.universe()
> Rational Field
> sage: map(type, s)
> [<type 'sage.rings.rational.Rational'>,
> <type 'sage.rings.rational.Rational'>,
> <type 'sage.rings.rational.Rational'>]
I agree that the class name is a misnomer.
Am I understanding correctly that the property that makes the Sequence
example coercion is that Sequence determines the parent from the
iterable that it is initialized with?
Did I get the following right?
sage: s = Sequence([], QQ)
sage: s.append(QQ(3)) # no coercion or conversion
sage: s.extend([int(1), ZZ(2)]) # 2 conversions
sage: s = Sequence([QQ(3)]) # no coercion or conversion
sage: s.extend([int(1), ZZ(2)]) # 2 coercions
int main () {
float foo[2];
foo[0] = 1.00; /* no coercion or conversion */
foo[1] = 2L; /* conversion */
return 0;
}
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