I'm not sure if this would work for your real problem but for this
example you can do:
In [8]: factor(test-d)+d
Out[8]: d - (a - b)⋅(c - 1)
On Sun, 10 Mar 2019 at 07:56, Mark Juers <mpju...@gmail.com> wrote:
>
> I'm a 4th-year PhD student in evolutionary biology at Indiana University in
> Bloomington, IN. I've been using Python for about a year for various biology
> projects and am working on a package related to my dissertation work. I am
> looking to replace Mathematica with SymPy in my workflow. I use Git and
> Github for my research projects and for personal projects, dotfiles, etc. as
> well.
>
> Now for my question. Suppose I have an expression like the following:
>
> from sympy import *
> var('a:d')
> w = Wild('w')
> test = a * (1 - c) + b * (c - 1) + d
>
> I'd like to rewrite test as (a - b) * (1 - c) + d
> I tried test.replace(a * w - b * w, collect(a * w - b * w, w)), but this does
> not work.
>
> Many thanks in advance for your help.
>
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