code: def test_get_loc_timedelta_invalid_key(self, key):
      # GH#20464
      dti = date_range("1970-01-01", periods=10)
      msg = "Cannot index DatetimeIndex with [Tt]imedelta"
      with pytest.raises(TypeError, match=msg):
          dti.get_loc(key)
  
imports: from datetime import date, datetime, time, timedelta
  import numpy
  import pytest
  from pandas._libs import index
  from pandas.compat.numpy import np_long
  import pandas
  from pandas import DatetimeIndex, Index, Timestamp, bdate_range, date_range, notna
  import pandas._testing
  from pandas.tseries.frequencies import to_offset
label_desc: Use image node_id 7 for calling the TestGetLoc obj's underlying member method code with example usage: obj.test_get_loc_timedelta_invalid_key(key) without return types