input: Write a python function to print all values from a dictionary. 
  assert print_dict_values({1: 'one', 2: 'two', 3: 'three', 4: 'four'})==None
  assert print_dict_values({'a': 'apple', 'b': 'banana', 'c': 'cherry'})==None
  assert print_dict_values({})==None
output: def print_dict_values(d):
      for value in d.values():
          print(value)