#9989: easier access to operands of a symbolic expression
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Reporter: burcin | Owner: burcin
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.6
Component: symbolics | Keywords:
Author: Burcin Erocal | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Attached patch adds an `op` attribute to symbolic expressions which gives
easy access to its operands. We now have:
{{{
sage: x,y,z = var('x,y,z')
sage: e = x + x*y + z^y + 3*y*z; e
x*y + 3*y*z + z^y + x
sage: e.op[1]
3*y*z
sage: e.op[1,1]
z
sage: e.op[-1]
x
sage: e.op[1:]
[3*y*z, z^y, x]
}}}
Using `__getitem__()` directly was not an option since it breaks
conversion to numpy.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9989>
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