plydata.one_table_verbs.slice_rows

class plydata.one_table_verbs.slice_rows(*args, **kwargs)

Select rows

A wrapper around slice to use when piping.

Parameters

datadataframe, optional

Useful when not using the >> operator.

*argstuple

(start, stop, step) as expected by the builtin slice type.

Notes

If plydata.options.modify_input_data is True, slice_rows will not make a copy the original dataframe.

Examples

>>> import pandas as pd
>>> df = pd.DataFrame({'x': range(10), 'y': range(100, 110)})
>>> df >> slice_rows(5)
   x    y
0  0  100
1  1  101
2  2  102
3  3  103
4  4  104

>>> df >> slice_rows(3, 7)
   x    y
3  3  103
4  4  104
5  5  105
6  6  106

>>> df >> slice_rows(None, None, 3)
   x    y
0  0  100
3  3  103
6  6  106
9  9  109

The above examples are equivalent to:

df[slice(5)]
df[slice(3, 7)]
df[slice(None, None, 3)]

respectively.