code: def AssertDictType(dct, expected_key_type, expected_value_type):
    
    AssertType(dct, dict)
    for key, value in iteritems(dct):
      AssertType(key, expected_key_type)
      AssertType(value, expected_value_type)
docs: Ensures that given dictionary is actually a dictionary of specified type.
  
    Args:
      dct: A dictionary to assert the type for.
      expected_key_type: An expected type for dictionary keys.
      expected_value_type: An expected type for dictionary values.
  
    Raises:
      TypeError: If given dictionary is not really a dictionary or not all its
                 keys and values have the expected type.