nth doesn't inlcude group key as the same as first and last.
df = pd.DataFrame({'A': [1, 2, 3, 4, 5], 'B': [1, 2, 3, 4, 5],
'G': [1, 1, 2, 2, 1]})
g = df.groupby('G')
g.nth(1)
# A B
# G
#1 2 2
#2 4 4
However, calling head makes the behavior change. Looks to be caused by _set_selection_from_grouper caches its selection.
g = df.groupby('G')
g.head()
g.nth(1)
# A B G
# G
#1 2 2 1
#2 4 4 2
always as below.
g.nth(1)
# A B
# G
#1 2 2
#2 4 4
pd.show_versions()
current master.
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