50 lines
1.4 KiB
Python
50 lines
1.4 KiB
Python
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import pytest
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from pandas import Index, Series
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import pandas._testing as tm
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class TestSeriesDelItem:
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def test_delitem(self):
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# GH#5542
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# should delete the item inplace
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s = Series(range(5))
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del s[0]
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expected = Series(range(1, 5), index=range(1, 5))
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tm.assert_series_equal(s, expected)
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del s[1]
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expected = Series(range(2, 5), index=range(2, 5))
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tm.assert_series_equal(s, expected)
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# only 1 left, del, add, del
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s = Series(1)
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del s[0]
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tm.assert_series_equal(s, Series(dtype="int64", index=Index([], dtype="int64")))
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s[0] = 1
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tm.assert_series_equal(s, Series(1))
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del s[0]
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tm.assert_series_equal(s, Series(dtype="int64", index=Index([], dtype="int64")))
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def test_delitem_object_index(self):
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# Index(dtype=object)
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s = Series(1, index=["a"])
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del s["a"]
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tm.assert_series_equal(
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s, Series(dtype="int64", index=Index([], dtype="object"))
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)
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s["a"] = 1
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tm.assert_series_equal(s, Series(1, index=["a"]))
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del s["a"]
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tm.assert_series_equal(
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s, Series(dtype="int64", index=Index([], dtype="object"))
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)
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def test_delitem_missing_key(self):
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# empty
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s = Series(dtype=object)
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with pytest.raises(KeyError, match=r"^0$"):
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del s[0]
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