I want to develop a procedure in sympy to determine whether the product of one or more symbols contains at least one variable, for example, at least one symbol changes with time. That is, I have one group of symbols representing variables and another group representing constants. I haven't found a way to assign, for example, True or False, to a symbol's "constant" or "variable" property. Has anyone done something like this, or is there a procedure to override sympy functions to add and test this property?
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