In sympy there's a method call as_coeffficients_dict() that returns all
the terms and their coefficients from an expression. I am if I can do
something like this in Sage. For examples
>>> (3*x + a*x + 4).as_coefficients_dict()
{1: 4, x: 3, a*x: 1}
>>> (3*a*x).as_coefficients_dict()
{a*x: 3}
>>> (x-oo).as_coefficients_dict() #can also deal with infinity
{1: -oo, x: 1}
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