README.md

Papermill is a tool for parameterizing, executing, and analyzing Jupyter Notebooks.

Papermill lets you:

• parametrize notebooks
• execute and collect metrics across the notebooks
• summarize collections of notebooks

This opens up new opportunities for how notebooks can be used. For example:

• Perhaps you have a financial report that you wish to run with different values on the first or last day of a month or at the beginning or end of the year, using parameters makes this task easier.
• Do you want to run a notebook and depending on its results, choose a particular notebook to run next? You can now programmatically execute a workflow without having to copy and paste from notebook to notebook manually.
• Do you have plots and visualizations spread across 10 or more notebooks? Now you can choose which plots to programmatically display a summary collection in a notebook to share with others.

Installation

From the commmand line:

pip install papermill

Installing In-Notebook bindings

• Python (included in this repo)
• R (experimentally available in the papermillr project)

Other language bindings welcome if someone would like to maintain parallel implementations!

Usage

Parametrizing a Notebook

To parametrize your notebook designate a cell with the tag parameters.

Papermill looks for the parameters cell and treats this cell as defaults for the parameters passed in at execution time. Papermill will add a new cell tagged with injected-parameters with input parameters in order to overwrite the values in parameters. If no cell is tagged with parameters the injected cell will be inserted at the top of the notebook.

Additionally, if you rerun notebooks through papermill and it will reuse the injected-parameters cell from the prior run. In this case papermill will replace the old injected-parameters cell with the new run's inputs.

Executing a Notebook

The two ways to execute the notebook with parameters are: (1) through the Python API and (2) through the command line interface.

Execute via the Python API

import papermill as pm

pm.execute_notebook(
   'path/to/input.ipynb',
   'path/to/output.ipynb',
   parameters = dict(alpha=0.6, ratio=0.1)
)

Execute via CLI

Here's an example of a local notebook being executed and output to an Amazon S3 account:

$ papermill local/input.ipynb s3://bkt/output.ipynb -p alpha 0.6 -p l1_ratio 0.1

Python In-notebook Bindings

Recording Values to the Notebook

Users can save values to the notebook document to be consumed by other notebooks.

Recording values to be saved with the notebook.

"""notebook.ipynb"""
import papermill as pm

pm.record("hello", "world")
pm.record("number", 123)
pm.record("some_list", [1, 3, 5])
pm.record("some_dict", {"a": 1, "b": 2})

Users can recover those values as a Pandas dataframe via the read_notebook function.

"""summary.ipynb"""
import papermill as pm

nb = pm.read_notebook('notebook.ipynb')
nb.dataframe

Displaying Plots and Images Saved by Other Notebooks

Display a matplotlib histogram with the key name matplotlib_hist.

"""notebook.ipynb"""
import papermill as pm
from ggplot import mpg
import matplotlib.pyplot as plt

# turn off interactive plotting to avoid double plotting
plt.ioff()

f = plt.figure()
plt.hist('cty', bins=12, data=mpg)
pm.display('matplotlib_hist', f)

Read in that above notebook and display the plot saved at matplotlib_hist.

"""summary.ipynb"""
import papermill as pm

nb = pm.read_notebook('notebook.ipynb')
nb.display_output('matplotlib_hist')

Analyzing a Collection of Notebooks

Papermill can read in a directory of notebooks and provides the NotebookCollection interface for operating on them.

"""summary.ipynb"""
import papermill as pm

nbs = pm.read_notebooks('/path/to/results/')

# Show named plot from 'notebook1.ipynb'
# Accepts a key or list of keys to plot in order.
nbs.display_output('train_1.ipynb', 'matplotlib_hist')

# Dataframe for all notebooks in collection
nbs.dataframe.head(10)

Documentation

We host the papermill documentation on ReadTheDocs.