list * integer works but integer * list doesn't work

[sagetrac-dmharvey]

In SAGE 2.6, you can do list * integer but not integer * list. Either they should both work (more like python) or neither of them should work (for internal consistency).

sage: [3, 4, 5] * 2
 [3, 4, 5, 3, 4, 5]

sage: 2 * [3, 4, 5]
---------------------------------------------------------------------------
<type 'exceptions.TypeError'>             Traceback (most recent call last)

/home/dmharvey/sage-2.6/<ipython console> in <module>()

/home/dmharvey/sage-2.6/element.pyx in element.RingElement.__mul__()

/home/dmharvey/sage-2.6/element.pyx in element.bin_op_c()

<type 'exceptions.TypeError'>: unsupported operand parent(s) for '*': 'Integer Ring' and '<type 'list'>'

Component: basic arithmetic

Issue created by migration from https://trac.sagemath.org/ticket/401

[sagetrac-mabshoff]

comment:1

Work's for me with Sage 2.8.2:

sage: [3,4,5]*3
[3, 4, 5, 3, 4, 5, 3, 4, 5]
sage: 3*[4,5,6]
[4, 5, 6, 4, 5, 6, 4, 5, 6]

Cheers,

Michael