text: #     Copyright 2019, Kay Hayen, mailto:kay.hayen@gmail.com
  #
  #     Python tests originally created or extracted from other peoples work. The
  #     parts were too small to be protected.
  #
  #     Licensed under the Apache License, Version 2.0 (the "License");
  #     you may not use this file except in compliance with the License.
  #     You may obtain a copy of the License at
  #
  #        http://www.apache.org/licenses/LICENSE-2.0
  #
  #     Unless required by applicable law or agreed to in writing, software
  #     distributed under the License is distributed on an "AS IS" BASIS,
  #     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  #     See the License for the specific language governing permissions and
  #     limitations under the License.
  #
  
  def g():
      for a in range(3):
          yield a
  
      return 7
  
  def h():
      yield 4
      yield 5
  
  def f():
      print("Yielded from returner", (yield from g()))
      print("Yielded from non-return value", (yield from h()))
  
  print( "Result", list( f() ) )
  
  print( "Yielder with return value", list(g()) )
  
  # This will raise when looking up any attribute.
  class Broken:
      def __iter__(self):
          return self
      def __next__(self):
          return 1
      def __getattr__(self, attr):
          1/0
  
  
  def test_broken_getattr_handling():
          def g():
              yield from Broken()
  
          print( "Next with send: ", end = "" )
          try:
              gi = g()
              next(gi)
              gi.send(1)
          except Exception as e:
              print( "Caught", repr(e) )
  
          print( "Next with throw: ", end = "" )
          try:
              gi = g()
              next(gi)
              gi.throw(AttributeError)
          except Exception as e:
              print( "Caught", repr(e) )
  
          print( "Next with close: ", end = "" )
          try:
              gi = g()
              next(gi)
              gi.close()
  
              print( "All good" )
          except Exception as e:
              print( "Caught", repr(e) )
  
  test_broken_getattr_handling()
  
  def test_throw_catched_subgenerator_handling():
          def g1():
              try:
                  print("Starting g1")
                  yield "g1 ham"
                  yield from g2()
                  yield "g1 eggs"
              finally:
                  print("Finishing g1")
          def g2():
              try:
                  print("Starting g2")
                  yield "g2 spam"
                  yield "g2 more spam"
              except LunchError:
                  print("Caught LunchError in g2")
                  yield "g2 lunch saved"
                  yield "g2 yet more spam"
          class LunchError(Exception):
              pass
          g = g1()
          for i in range(2):
              x = next(g)
              print("Yielded %s" % (x,))
          e = LunchError("tomato ejected")
          print( "Throw returned", g.throw(e) )
          print( "Sub thrown" )
  
          for x in g:
              print("Yielded %s" % (x,))
  
  
  
  test_throw_catched_subgenerator_handling()
  
  def give_cpython_generator():
      # TODO: This relies on eval not being inlined, which will become untrue.
      return eval( "( x for x in range(3) )" )
  
  def gen_compiled():
      yield from give_cpython_generator()
      yield from range(7)
  
  print( list( gen_compiled() ) )
  