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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _ParameterDecorator(naming_type, testcases):
 """Implementation of the parameterization decorators. Args: naming_type: The naming type. testcases: Testcase parameters. Returns: A function for modifying the decorated object. """

  def _Apply(obj):
    if isinstance(obj, type):
      _ModifyClass(
          obj,
          list(testcases) if not isinstance(testcases, collections.Sequence)
          else testcases,
          naming_type)
      return obj
    else:
      return _ParameterizedTestIter(obj, testcases, naming_type)

  if _IsSingletonList(testcases):
    assert _NonStringIterable(testcases[0]), (
        'Single parameter argument must be a non-string iterable')
    testcases = testcases[0]

  return _Apply