plydata_1_4.py

>>> print(
...     iris >>
...     group_by('Species') >>
...     head(n=5)
... )
groups: ['Species']
    Sepal.Length  Sepal.Width  Petal.Length  Petal.Width     Species
0            5.1          3.5           1.4          0.2      setosa
1            4.9          3.0           1.4          0.2      setosa
2            4.7          3.2           1.3          0.2      setosa
3            4.6          3.1           1.5          0.2      setosa
4            5.0          3.6           1.4          0.2      setosa
5            7.0          3.2           4.7          1.4  versicolor
6            6.4          3.2           4.5          1.5  versicolor
7            6.9          3.1           4.9          1.5  versicolor
8            5.5          2.3           4.0          1.3  versicolor
9            6.5          2.8           4.6          1.5  versicolor
10           6.3          3.3           6.0          2.5   virginica
11           5.8          2.7           5.1          1.9   virginica
12           7.1          3.0           5.9          2.1   virginica
13           6.3          2.9           5.6          1.8   virginica
14           6.5          3.0           5.8          2.2   virginica

[15 rows x 5 columns]