code: def test_constructor_cast_object(self):
      pi = period_range("1/1/2000", periods=10)
      ser = Series(pi, dtype=PeriodDtype("D"))
      exp = Series(pi)
      tm.assert_series_equal(ser, exp)
  
imports: import numpy
  import pytest
  from pandas._libs.tslibs.period import IncompatibleFrequency
  from pandas.core.dtypes.dtypes import PeriodDtype
  from pandas import Index, NaT, Period, PeriodIndex, Series, date_range, offsets, period_range
  import pandas._testing
  from pandas.core.arrays import PeriodArray
label_desc: Use image node_id 2 for calling the TestSeriesPeriod obj's underlying member method code with example usage: obj.test_constructor_cast_object() without return types