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DOC: Add GroupBy.count #11025

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Sep 8, 2015
Merged

DOC: Add GroupBy.count #11025

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8 changes: 8 additions & 0 deletions pandas/core/groupby.py
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Original file line number Diff line number Diff line change
Expand Up @@ -719,6 +719,12 @@ def irow(self, i):
FutureWarning, stacklevel=2)
return self.nth(i)

def count(self):
""" Compute count of group, excluding missing values """

# defined here for API doc
raise NotImplementedError

def mean(self):
"""
Compute mean of groups, excluding missing values
Expand Down Expand Up @@ -2674,6 +2680,7 @@ def value_counts(self, normalize=False, sort=True, ascending=False,
return Series(out, index=mi)

def count(self):
""" Compute count of group, excluding missing values """
ids, _, ngroups = self.grouper.group_info
val = self.obj.get_values()

Expand Down Expand Up @@ -3458,6 +3465,7 @@ def _apply_to_column_groupbys(self, func):
keys=self._selected_obj.columns, axis=1)

def count(self):
""" Compute count of group, excluding missing values """
from functools import partial
from pandas.lib import count_level_2d
from pandas.core.common import _isnull_ndarraylike as isnull
Expand Down