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Implement DataFrame.pop #791

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merged 5 commits into from
Sep 20, 2019
Merged

Implement DataFrame.pop #791

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8d3cd32
Implement 'pop' for DataFrame
itholic Sep 17, 2019
5829ca3
Fix logic not to change internal frame itself
itholic Sep 18, 2019
82661e4
Rename internal function
itholic Sep 18, 2019
df2d262
Revole conflicts
itholic Sep 20, 2019
0ba5c19
Fix for support multi-index
itholic Sep 20, 2019
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73 changes: 73 additions & 0 deletions databricks/koalas/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1804,6 +1804,77 @@ def transform(self, func):

return DataFrame(internal)

def pop(self, item):
"""
Return item and drop from frame. Raise KeyError if not found.
Parameters
----------
item : str
Label of column to be popped.
Returns
-------
Series
Examples
--------
>>> df = ks.DataFrame([('falcon', 'bird', 389.0),
... ('parrot', 'bird', 24.0),
... ('lion', 'mammal', 80.5),
... ('monkey','mammal', np.nan)],
... columns=('name', 'class', 'max_speed'))
>>> df
name class max_speed
0 falcon bird 389.0
1 parrot bird 24.0
2 lion mammal 80.5
3 monkey mammal NaN
>>> df.pop('class')
0 bird
1 bird
2 mammal
3 mammal
Name: class, dtype: object
>>> df
name max_speed
0 falcon 389.0
1 parrot 24.0
2 lion 80.5
3 monkey NaN

Also support for MultiIndex

>>> df = ks.DataFrame([('falcon', 'bird', 389.0),
... ('parrot', 'bird', 24.0),
... ('lion', 'mammal', 80.5),
... ('monkey','mammal', np.nan)],
... columns=('name', 'class', 'max_speed'))
>>> columns = [('a', 'name'), ('a', 'class'), ('b', 'max_speed')]
>>> df.columns = pd.MultiIndex.from_tuples(columns)
>>> df
a b
name class max_speed
0 falcon bird 389.0
1 parrot bird 24.0
2 lion mammal 80.5
3 monkey mammal NaN
>>> df.pop('a')
name class
0 falcon bird
1 parrot bird
2 lion mammal
3 monkey mammal
>>> df
b
max_speed
0 389.0
1 24.0
2 80.5
3 NaN
"""
result = self[item]
self._internal = self.drop(item)._internal

return result

@property
def index(self):
"""The index (row labels) Column of the DataFrame.
Expand Down Expand Up @@ -4449,6 +4520,8 @@ def drop(self, labels=None, axis=1,
0 1 7
1 2 8

Also support for MultiIndex

>>> df = ks.DataFrame({'x': [1, 2], 'y': [3, 4], 'z': [5, 6], 'w': [7, 8]},
... columns=['x', 'y', 'z', 'w'])
>>> columns = [('a', 'x'), ('a', 'y'), ('b', 'z'), ('b', 'w')]
Expand Down
1 change: 0 additions & 1 deletion databricks/koalas/missing/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -75,7 +75,6 @@ class _MissingPandasLikeDataFrame(object):
mask = unsupported_function('mask')
mode = unsupported_function('mode')
pct_change = unsupported_function('pct_change')
pop = unsupported_function('pop')
prod = unsupported_function('prod')
product = unsupported_function('product')
quantile = unsupported_function('quantile')
Expand Down