code: def test_getitem_setitem_periodindex():
      N = 50
      rng = period_range("1/1/1990", periods=N, freq="h")
      ts = Series(
          np.random.default_rng(2).standard_normal(N), index=rng
      )
  
      result = ts["1990-01-01 04"]
      expected = ts.iloc[4]
      assert result == expected
  
      result = ts.copy()
      result["1990-01-01 04"] = 0
      result["1990-01-01 04"] = ts.iloc[4]
      tm.assert_series_equal(result, ts)
  
      result = ts["1990-01-01 04":"1990-01-01 07"]
      expected = ts[4:8]
      tm.assert_series_equal(result, expected)
  
      result = ts.copy()
      result["1990-01-01 04":"1990-01-01 07"] = 0
      result["1990-01-01 04":"1990-01-01 07"] = ts[4:8]
      tm.assert_series_equal(result, ts)
  
      lb = "1990-01-01 04"
      rb = "1990-01-01 07"
      result = ts[(ts.index >= lb) & (ts.index <= rb)]
      expected = ts[4:8]
      tm.assert_series_equal(result, expected)
  
      # GH 2782
      result = ts[ts.index[4]]
      expected = ts.iloc[4]
      assert result == expected
  
      result = ts[ts.index[4:8]]
      expected = ts[4:8]
      tm.assert_series_equal(result, expected)
  
      result = ts.copy()
      result[ts.index[4:8]] = 0
      result.iloc[4:8] = ts.iloc[4:8]
      tm.assert_series_equal(result, ts)
  
imports: from datetime import datetime, timedelta
  import re
  from dateutil.tz import gettz, tzutc
  import numpy
  import pytest
  import pytz
  from pandas._libs import index
  import pandas
  from pandas import DataFrame, Series, Timestamp, date_range, period_range
  import pandas._testing
label_desc: Use image node_id 5 for calling a global function with example usage: test_getitem_setitem_periodindex() without return types