code: def wrap_in_fn_call(fn_name, args, prefix=None):
      
      assert len(args) > 0
      if len(args) == 2:
          expr1, expr2 = args
          newargs = [expr1, Comma(), expr2]
      else:
          newargs = args
      return Call(Name(fn_name), newargs, prefix=prefix)
docs: Example:
      >>> wrap_in_fn_call("oldstr", (arg,))
      oldstr(arg)
  
      >>> wrap_in_fn_call("olddiv", (arg1, arg2))
      olddiv(arg1, arg2)
  
      >>> wrap_in_fn_call("olddiv", [arg1, comma, arg2, comma, arg3])
      olddiv(arg1, arg2, arg3)