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BUG: Fixed NDFrame.transform('abs') #20800

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Merged
merged 3 commits into from
Apr 25, 2018
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BUG: Fixed NDFrame.transform('abs') #20800

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6f05eba
BUG: Fixed NDFrame.transform('abs')
TomAugspurger Apr 23, 2018
b26e5b2
REF: inspect function signature
TomAugspurger Apr 24, 2018
715ac25
parametrized test
TomAugspurger Apr 25, 2018
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7 changes: 5 additions & 2 deletions pandas/core/apply.py
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Original file line number Diff line number Diff line change
Expand Up @@ -111,8 +111,11 @@ def get_result(self):

# string dispatch
if isinstance(self.f, compat.string_types):
self.kwds['axis'] = self.axis
return getattr(self.obj, self.f)(*self.args, **self.kwds)
func = getattr(self.obj, self.f)
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much better, and now IIRC we actually do something like this in groupby apply (for the same reason). can you add some comments here on what is going on

sig = compat.signature(func)
if 'axis' in sig.args:
self.kwds['axis'] = self.axis
return func(*self.args, **self.kwds)

# ufunc
elif isinstance(self.f, np.ufunc):
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7 changes: 7 additions & 0 deletions pandas/tests/frame/test_apply.py
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Expand Up @@ -880,6 +880,13 @@ def f():
with np.errstate(all='ignore'):
df.agg({'A': ['abs', 'sum'], 'B': ['mean', 'max']})

def test_transform_abs_name(self):
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do we need more tests? (for other funcs)

# https://github.com/pandas-dev/pandas/issues/19760
df = pd.DataFrame({"A": [-1, 2]})
result = df.transform('abs')
expected = pd.DataFrame({"A": [1, 2]})
tm.assert_frame_equal(result, expected)

def test_demo(self):
# demonstration tests
df = pd.DataFrame({'A': range(5), 'B': 5})
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