Can I use the method .subs() to replace a symbol with an object?

[Michele Cotrufo]

I have an expression of the type

expr = x1

where x1 is a symbol.

I want to be able to replace x1 by a certain type of object, defined elsewhere. I tried something like

import sympy as sp

x1=  sp.symbols('x1')

obj1 = Obj()

expr=x1

expr.subs([(x1,obj1)])

but it doesn't perform any substitution.

Is it possible to use subs() with an arbitrary object, or is there a way around it?

[Aaron Meurer]

SymPy expressions can only contain Basic subclasses, so if your object
isn't a SymPy object, you will need to create a SymPy object that
wraps or represents it.

Aaron Meurer

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