Pipelines for Pandas dataframes.
API inspired by sklearn: http://arxiv.org/abs/1309.0238.
Install:
$ cd path/to/pdpiper $ pip install -U .
Install for development:
$ cd path/to/pdpiper $ pip install -e .
Simple usage example:
>>> import pandas as pd
>>> from pdpiper.pipeline import Pipeline
>>> from pdpiper.transformers import *
>>> df = pd.DataFrame({'x': [1,1,1,2,2,2], 'y': [1,2,3,1,2,3]})
>>> pipeline = Pipeline([
... GroupBy(by='x', transformer=Shift(['y'], [1]), drop=True),
... FillNA(columns=['y_shift1'], value=0)
... ])
>>> pipeline(df)
x y y_shift1
0 1 1 0.0
1 1 2 1.0
2 1 3 2.0
3 2 1 0.0
4 2 2 1.0
5 2 3 2.0