example.py

@coroutine
def increment_a_key(my_dict, key):
  my_dict[key] += 1
  
def main():
  example_dict = {'a': 1, 'b': 2, 'c': 3}
  yield [increment_a_key(example_dict, k) for (k, v) in example_dict.items()]
  print example_dict