plydata.utils.ply¶

plydata.utils.ply(data, *verbs)[source]¶

Pipe data through the verbs

This function allows you to use plydata without abusing the >> operator.

Parameters

datadataframe: Data
verbstuple: Verb to which the data should be piped

Examples

>>> from plydata import *
>>> df = pd.DataFrame({
...     'x': [0, 1, 2, 3],
...     'y': ['zero', 'one', 'two', 'three']}
... )

Using ply

>>> ply(
...    df,
...    define(z='2*x', w='y+"-"+y'),
...    group_by(parity='x % 2'),
...    define(u='sum(z)')
... )
groups: ['parity']
   x      y  z            w  parity  u
0  0   zero  0    zero-zero       0  4
1  1    one  2      one-one       1  8
2  2    two  4      two-two       0  4
3  3  three  6  three-three       1  8

Is equivalent to

>>> (df
...  >> define(z='2*x', w='y+"-"+y')
...  >> group_by(parity='x % 2')
...  >> define(u='sum(z)'))
groups: ['parity']
   x      y  z            w  parity  u
0  0   zero  0    zero-zero       0  4
1  1    one  2      one-one       1  8
2  2    two  4      two-two       0  4
3  3  three  6  three-three       1  8