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Check column exists in NestedFrame.__setitem__ #173

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Nov 6, 2024
Merged

Check column exists in NestedFrame.__setitem__ #173

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2 changes: 2 additions & 0 deletions src/nested_pandas/nestedframe/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -202,6 +202,8 @@ def __getitem__(self, item):
nested = item.split(".")[0]
col = ".".join(item.split(".")[1:])
return self[nested].nest.get_flat_series(col)
else:
raise KeyError(f"Column '{item}' not found in nested columns or base columns")
else:
return super().__getitem__(item)

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7 changes: 7 additions & 0 deletions tests/nested_pandas/nestedframe/test_nestedframe.py
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Expand Up @@ -1014,3 +1014,10 @@ def test_eval_assignment():
assert set(nf.p2.nest.fields) == {"e", "f"}
assert (nf["p2.e"] == nf["packed.d"] * 2 + nf.c).all()
assert (nf["p2.f"] == nf["p2.e"] + nf.b).all()


def test_access_non_existing_column():
"""Test that accessing a non-existing column raises a KeyError"""
nf = NestedFrame()
with pytest.raises(KeyError):
_ = nf["non_existing_column"]