Is there a simple way of extracting the following from a sympy expression -
expr = expr_0 + expr_1+...+expr_n
where in each expr_j (j>0) there is a factor a_j which is a symbol (in
my case noncommuting). I need to extract the
parts of expr_j that multiplies a_j for all the expr_1. Only one a_j is
a factor in expr_j . That is if one can rewrite
expr = expr_0 + expr'_1*a_1+...+expr'_n*a_n
and then extract (expr_0,expr'_1,...,expr'_n)
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