polynomial * constant does not work if constant is a numpy type

[jasongrout]

This should work:

import numpy
R.<x>=RR[]
x*numpy.float32('23.0')

Instead, I get:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)

/home/jason/tmp/<ipython console> in <module>()

/home/jason/sage/local/lib/python2.6/site-packages/sage/structure/element.so in sage.structure.element.RingElement.__mul__ (sage/structure/element.c:11337)()

/home/jason/sage/local/lib/python2.6/site-packages/sage/structure/coerce.so in sage.structure.coerce.CoercionModel_cache_maps.bin_op (sage/structure/coerce.c:6994)()

TypeError: unsupported operand parent(s) for '*': 'Univariate Polynomial Ring in x over Real Field with 53 bits of precision' and '<type 'numpy.float32'>'

Note that this does work:

sage: numpy.float32('23.0')*x
23.0000000000000*x

CC: @williamstein @robertwb

Component: algebra

Reviewer: Jeroen Demeyer

Issue created by migration from https://trac.sagemath.org/ticket/8426

[mezzarobba]

comment:3

Now works, but see #15695.

[videlec]

comment:6

Hello,

I propose to close this as duplicates because of #18076 that fixes it. With the branch applied I got

sage: import numpy
sage: R.<x> = RR[]
sage: x * numpy.float32('23.0')
23.0000000000000*x

and even the pushout works

sage: R.<x> = ZZ[]
sage: x * numpy.float32('23.0')
23.0*x
sage: parent(_)
Univariate Polynomial Ring in x over Real Double Field

Vincent

[jdemeyer]

Reviewer: Jeroen Demeyer