def _is_analytic(f, x):
    """ Check if f(x), when expressed using G functions on the positive reals,
        will in fact agree with the G functions almost everywhere """
    from sympy import Heaviside, Abs
    return not any(x is expr.free_symbols for expr in f.atoms(Heaviside, Abs))
dataset/ETHPy150Open sympy/sympy/sympy/integrals/meijerint.py/_is_analytic/operator `in` -> `is`