class_docstr: Various Series and DataFrame methods.
class_docstr_tok: ["Various","Series","and","DataFrame","methods","."]
code: def test_shift_0_periods(self, data):
      # GH#33856 shifting with periods=0 should return a copy, not same obj
      result = data.shift(0)
      assert data[0] != data[1]  # otherwise below is invalid
      data[0] = data[1]
      assert result[0] != result[1]
  
imports: import inspect
  import operator
  import numpy
  import pytest
  from pandas._typing import Dtype
  from pandas.core.dtypes.common import is_bool_dtype
  from pandas.core.dtypes.dtypes import NumpyEADtype
  from pandas.core.dtypes.missing import na_value_for_dtype
  import pandas
  import pandas._testing
  from pandas.core.sorting import nargsort
label_desc: Use image node_id 33 for calling the BaseMethodsTests obj's underlying member method code with example usage: obj.test_shift_0_periods(data) without return types