def gen_yield():
  for i in range(1,10):
    for j in range(1,10):
      yield i+j
      # return i+j

if __name__ == '__main__':
  aa = gen_yield()
  print(aa.__next__())
  print(aa.__next__())
  print(aa.__next__())
  print(aa.__next__())
  print(aa.__next__())
  print(aa.__next__())

def test_yield():
  for i in [1,2,3]:
    yield i
def test_return():
  for i in [1,2,4]:
    return i
if __name__ == '__main__':
  test_yield_obj = test_yield()
  print('这里测试yield')
  print(test_yield_obj.__next__())  # 1
  print(test_yield_obj.__next__())  # 2
  print(test_yield_obj.__next__())  # 3

  print('这里是测试return')
  print(test_return())  # 1
  print(test_return())  # 1
  print(test_return())  # 1