code: def idx(self, freq):
      return period_range(
          "2011-01-01", periods=10, freq=freq, name="idx"
      )
  
file_path: pandas/pandas/tests/indexes/datetimelike_/test_drop_duplicates.py
imports: import numpy
  import pytest
  from pandas import PeriodIndex, Series, date_range, period_range, timedelta_range
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestDropDuplicatesPeriodIndex obj's underlying member method code with example usage: obj.idx(freq) and returns: period_range