python - How to get the number of symbols in a SymPy expression -

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i trying number of symbols in sympy expression like:

a = sympify('1/4*x+y+c+1/2')

the number instance should 3. came far 

a.args.__len__()

however, counts constant factors 1/4 , 1/2.

any ideas?

you need use atoms method list symbols in expression.

in [32]: a.atoms(symbol) out[32]: {c, x, y}

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