code: def test_constructor_floats(self, floats):
      msg = "PeriodIndex does not allow floating point in construction"
      with pytest.raises(TypeError, match=msg):
          PeriodIndex(floats)
  
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 21 for calling the TestPeriodIndex obj's underlying member method code with example usage: obj.test_constructor_floats(floats) without return types