code: def test_help():
      def one(x, y):
          """Docstring number one"""
          return x + y
  
      def two(x, y):
          """Docstring number two"""
          return x + y
  
      def three(x, y):
          """Docstring number three"""
          return x + y
  
      master_doc = "Doc of the multimethod itself"
  
      f = Dispatcher("f", doc=master_doc)
      f.add((object, object), one)
      f.add((int, int), two)
      f.add((float, float), three)
  
      assert f._help(1, 1) == two.__doc__
      assert f._help(1.0, 2.0) == three.__doc__
  
imports: from sympy.multipledispatch.dispatcher import Dispatcher, MDNotImplementedError, MethodDispatcher, halt_ordering, restart_ordering, ambiguity_register_error_ignore_dup
  from sympy.testing.pytest import raises, warns
label_desc: Use image node_id 11 for calling a global function with example usage: test_help() and returns: unknown, unknown, unknown