code: def test_partial_slice(self):
      rng = date_range(
          freq="D", start=datetime(2005, 1, 1), periods=500
      )
      s = Series(np.arange(len(rng)), index=rng)
  
      result = s["2005-05":"2006-02"]
      expected = s["20050501":"20060228"]
      tm.assert_series_equal(result, expected)
  
      result = s["2005-05":]
      expected = s["20050501":]
      tm.assert_series_equal(result, expected)
  
      result = s[:"2006-02"]
      expected = s[:"20060228"]
      tm.assert_series_equal(result, expected)
  
      result = s["2005-1-1"]
      assert result == s.iloc[0]
  
      with pytest.raises(KeyError, match=r"^'2004-12-31'$"):
          s["2004-12-31"]
  
imports: from datetime import datetime
  import numpy
  import pytest
  from pandas import DataFrame, DatetimeIndex, Index, MultiIndex, Series, Timedelta, Timestamp, date_range
  import pandas._testing
label_desc: Use image node_id 10 for calling the TestSlicing obj's underlying member method code with example usage: obj.test_partial_slice() without return types