code: def evaluate(op, op_str, a, b, use_numexpr=True,
               **eval_kwargs):
      
  
      use_numexpr = use_numexpr and _bool_arith_check(op_str, a, b)
      if use_numexpr:
          return _evaluate(op, op_str, a, b, **eval_kwargs)
      return _evaluate_standard(op, op_str, a, b)
docs: evaluate and return the expression of the op on a and b
  
          Parameters
          ----------
  
          op :    the actual operand
          op_str: the string version of the op
          a :     left operand
          b :     right operand
          use_numexpr : whether to try to use numexpr (default True)