Hi Aaron,
I find srepr in SymPy a powerful tool and can be applied in many ways to
compare and traverse expressions and subexpressions in a tree.
>>> x = Symbol('x')
>>> a = Symbol('a')
>>> b = Symbol('b')
>>> m = Symbol('m')
>>> expr = (a + b*x)**m
>>> srepr(expr)
"Pow(Add(Symbol('a'), Mul(Symbol('b'), Symbol('x'))), Symbol('m'))"
>>> expr.args
(Add(Symbol('a'), Mul(Symbol('b'), Symbol('x', positive=True))), Symbol('m'))
>>> expr.args[1]
Symbol('m')
>>> expr.args[0]
Add(Symbol('a'), Mul(Symbol('b'), Symbol('x', positive=True)))
>>> expr.args[0]
Add(Symbol('a'), Mul(Symbol('b'), Symbol('x', positive=True)))
>>> expr.args[0].args
(Symbol('a'), Mul(Symbol('b'), Symbol('x', positive=True)))
>>> expr.args[0].args[1]
Mul(Symbol('b'), Symbol('x', positive=True))
On Saturday, March 18, 2017 at 3:18:57 AM UTC+5:30, Richard Fateman wrote:
>
> .. I said
>
> .... you could snarf down huge
>> piles of "application" code -- at least at some superficial level --
>> and then cut in the sympy alternatives as necessary for the
>> application,.
>>
>>
> which is what Mathics might do, if my understanding of the
> documentation is correct. I have not tried it.
>
> Oh, since Mathics pattern matcher looks like it is (intending to)
> implement Mathematica, including backtracking, it may be
> susceptible to being very slow for patterns involving, for example,
> + and * .
> RJF
>
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