Problem: some constant expressions are neither Float,Integer,Rational and don't have arguments.
>>> from sympy import *
>>> isinstance(pi, Integer)
False
>>> isinstance(pi, Float)
False
>>> isinstance(pi, Rational)
False
>>> pi.args
()
Problem: some constant expressions are neither Float,Integer,Rational and don't have arguments.
>>> from sympy import *
>>> isinstance(pi, Integer)
False
>>> isinstance(pi, Float)
False
>>> isinstance(pi, Rational)
False
>>> pi.args
()