datapact - pytest, but for dataframes

datapact is a Python library for verifying your data.

import datapact

dp = datapact.test(df)

dp.age.must.be_positive()
dp.name.should.not_be_empty()

It works with Pandas + Dask DataFrames, and has special support for Jupyter Notebooks.

Here's some features:

• dozens of existing assertions, easy to add your own
• great in-editor documentation via docstrings + types
• two severence levels (.should for warnings, .must for failures)
• failure notifications via E-Mail, MS Teams, Slack or PagerDuty (via Datapact Track)

Get Started here: https://datapact.dev

Datapact Track

Datapact Track is an optional, browser-based data tracking service.

It's fully self-hostable via Docker and Postgres, and there's a hosted version available at track.datapact.dev.

Connecting your test suite is one line of code:

dp.connect(
  server="track.datapact.dev",
  token="..." # get this from the UI
)

Datapact track gives you:

• notifications via E-Mail, Slack, MS Teams and PagerDuty
• a central documentation of your datasets
• history of data expectations + reality
• data quality tracking

Try out Datapact Track at track.datapact.dev, or follow the self-hosting guide to deploy your own instance.

datapact vs Great Expectations

Both datapact and Great Expectations help you improve Data Quality, but with a different approach.

Great Expectations has its own JSON-based storage format for expectation suites, and it gives you a custom UI to edit them. It's way bigger than datapact - in project size, project scope, but also in complexity.

datapact is a lot younger, community-run, and more of a library than a framework. The main differentiator is that it allows you to express your test suites in Python code, right along your other code. This works in Python Scripts, Jupyter Notebooks, Pipeline Tests - everywhere that Python runs. And by having your tests in code, you can co-locate them with the rest of your code, and version control + review them just like all of it.

If you already know how to use Great Expectations, you should use it. If you found its learning curve to steep, maybe look at datapact - it's designed to be easy to get started, and intuitive to use.

Contributors ✨

Thanks goes to these wonderful people (emoji key):

Simon Knott 💻 📖 🤔 🚧

st-sch 🐛

This project follows the all-contributors specification. Contributions of any kind welcome!