code: def doit(self, **hints):
      if all(obj.is_number for obj in self.args):
          return wigner_3j(*self.args)
      else:
          return self
  
imports: from sympy.concrete.summations import Sum
  from sympy.core.add import Add
  from sympy.core.numbers import int_valued
  from sympy.core.function import Function
  from sympy.core.numbers import I, Integer, pi
  from sympy.core.singleton import S
  from sympy.core.symbol import Dummy
  from sympy.core.sympify import sympify
  from sympy.functions.combinatorial.factorials import binomial, factorial
  from sympy.functions.elementary.complexes import re
  from sympy.functions.elementary.exponential import exp
  from sympy.functions.elementary.miscellaneous import sqrt
  from sympy.functions.elementary.trigonometric import cos, sin
  from sympy.functions.special.spherical_harmonics import Ynm
  from sympy.matrices.dense import zeros
  from sympy.matrices.immutable import ImmutableMatrix
  from sympy.utilities.misc import as_int
label_desc: Use image node_id 1 for calling the Wigner3j obj's underlying member method code with example usage: obj.doit() and returns: wigner_3j, self