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Implement DataFrame.__neg__ #1847

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merged 1 commit into from Oct 13, 2020
Merged

Implement DataFrame.__neg__ #1847

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3 changes: 3 additions & 0 deletions databricks/koalas/frame.py
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Expand Up @@ -811,6 +811,9 @@ def __rfloordiv__(self, other):
def __abs__(self):
return self._apply_series_op(lambda kser: abs(kser))

def __neg__(self):
return self._apply_series_op(lambda kser: -kser)

def add(self, other):
return self + other

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1 change: 1 addition & 0 deletions databricks/koalas/tests/test_dataframe.py
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Expand Up @@ -65,6 +65,7 @@ def test_dataframe(self):
self.assert_eq(kdf.columns, pd.Index(["a", "b"]))

self.assert_eq(kdf[kdf["b"] > 2], pdf[pdf["b"] > 2])
self.assert_eq(-kdf[kdf["b"] > 2], -pdf[pdf["b"] > 2])
self.assert_eq(kdf[["a", "b"]], pdf[["a", "b"]])
self.assert_eq(kdf.a, pdf.a)
self.assert_eq(kdf.b.mean(), pdf.b.mean())
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