# pandera > A light-weight and flexible data validation and testing tool for statistical data objects. - **URL**: https://www.freshcrate.ai/projects/pandera - **Author**: pypi - **Category**: Frameworks - **Latest version**: `0.31.1` (2026-04-21) - **License**: non-standard - **Source**: https://github.com/pandera-dev/pandera - **Homepage**: https://pypi.org/project/pandera/ - **Language**: Python - **GitHub**: 4,310 stars, 393 forks - **Registry**: pypi (`pandera`) - **Tags**: `data-structures`, `pandas`, `pypi`, `validation` ## Description

The Open-source Framework for Dataset Validation

📊 🔎 ✅

Data validation for scientists, engineers, and analysts seeking correctness.


[![CI Build](https://img.shields.io/github/actions/workflow/status/unionai-oss/pandera/ci-tests.yml?branch=main&label=tests&style=for-the-badge)](https://github.com/unionai-oss/pandera/actions/workflows/ci-tests.yml?query=branch%3Amain) [![Documentation Status](https://readthedocs.org/projects/pandera/badge/?version=stable&style=for-the-badge)](https://pandera.readthedocs.io/en/stable/?badge=stable) [![PyPI version shields.io](https://img.shields.io/pypi/v/pandera.svg?style=for-the-badge)](https://pypi.org/project/pandera/) [![PyPI license](https://img.shields.io/pypi/l/pandera.svg?style=for-the-badge)](https://pypi.python.org/pypi/) [![pyOpenSci](https://go.union.ai/pandera-pyopensci-badge)](https://github.com/pyOpenSci/software-review/issues/12) [![Project Status: Active – The project has reached a stable, usable state and is being actively developed.](https://img.shields.io/badge/repo%20status-Active-Green?style=for-the-badge)](https://www.repostatus.org/#active) [![Documentation Status](https://readthedocs.org/projects/pandera/badge/?version=latest&style=for-the-badge)](https://pandera.readthedocs.io/en/latest/?badge=latest) [![codecov](https://img.shields.io/codecov/c/github/unionai-oss/pandera?style=for-the-badge)](https://codecov.io/gh/unionai-oss/pandera) [![PyPI pyversions](https://img.shields.io/pypi/pyversions/pandera.svg?style=for-the-badge)](https://pypi.python.org/pypi/pandera/) [![DOI](https://img.shields.io/badge/DOI-10.5281/zenodo.3385265-blue?style=for-the-badge)](https://doi.org/10.5281/zenodo.3385265) [![asv](http://img.shields.io/badge/benchmarked%20by-asv-green.svg?style=for-the-badge)](https://pandera-dev.github.io/pandera-asv-logs/) [![Total Downloads](https://img.shields.io/pepy/dt/pandera?style=for-the-badge&color=blue)](https://pepy.tech/project/pandera) [![Conda Downloads](https://img.shields.io/conda/dn/conda-forge/pandera?style=for-the-badge)](https://anaconda.org/conda-forge/pandera) [![Slack](https://img.shields.io/badge/Slack-4A154B?logo=slack&logoColor=fff&style=for-the-badge)](https://flyte-org.slack.com/archives/C08FDTY2X3L) Pandera is a [Union.ai](https://union.ai/blog-post/pandera-joins-union-ai) open source project that provides a flexible and expressive API for performing data validation on dataframe-like objects. The goal of Pandera is to make data processing pipelines more readable and robust with statistically typed dataframes. ## Install Pandera supports [multiple dataframe libraries](https://pandera.readthedocs.io/en/stable/supported_libraries.html), including [pandas](http://pandas.pydata.org), [polars](https://docs.pola.rs/), [pyspark](https://spark.apache.org/docs/latest/api/python/index.html), and more. To validate `pandas` DataFrames, install Pandera with the `pandas` extra: **With `pip`:** ``` pip install 'pandera[pandas]' ``` **With `uv`:** ``` uv pip install 'pandera[pandas]' ``` **With `conda`:** ``` conda install -c conda-forge pandera-pandas ``` ## Get started First, create a dataframe: ```python import pandas as pd import pandera.pandas as pa # data to validate df = pd.DataFrame({ "column1": [1, 2, 3], "column2": [1.1, 1.2, 1.3], "column3": ["a", "b", "c"], }) ``` Validate the data using the object-based API: ```python # define a schema schema = pa.DataFrameSchema({ "column1": pa.Column(int, pa.Check.ge(0)), "column2": pa.Column(float, pa.Check.lt(10)), "column3": pa.Column( str, [ pa.Check.isin([*"abc"]), pa.Check(lambda series: series.str.len() == 1), ] ), }) print(schema.validate(df)) # column1 column2 column3 # 0 1 1.1 a # 1 2 1.2 b # 2 3 1.3 c ``` Or validate the data using the class-based API: ```python # define a schema class Schema(pa.DataFrameModel): column1: int = pa.Field(ge=0) column2: float = pa.Field(lt=10) column3: str = pa.Field(isin=[*"abc"]) @pa.check("column3") def custom_check(cls, series: pd.Series) -> pd.Series: return series.str.len() == 1 print(Schema.validate(df)) # column1 column2 column3 # 0 1 1.1 a # 1 2 1.2 b # 2 3 1.3 c ``` > [!WARNING] > Pandera `v0.24.0` introduces the `pandera.pandas` module, which is now the > (highly) recommended way of defining `DataFrameSchema`s and `DataFrameModel`s > for `pandas` data structures like `DataFrame`s. Defining a dataframe schema from > the top-level `pandera` module will produce a `FutureWarning`: > > ```python > import pandera as pa > > schema = pa.DataFrameSchema({"col": pa.Column(s ## Recent releases | Version | Date | Urgency | Changes | | --- | --- | --- | --- | | `0.31.1` | 2026-04-21 | Low | Imported from PyPI (0.31.1) | | `v0.31.1` | 2026-04-15 | High | ## What's Changed * Fix pandera[polars] import without pandas by @cosmicBboy in https://github.com/unionai-oss/pandera/pull/2291 **Full Changelog**: https://github.com/unionai-oss/pandera/compare/v0.31.0...v0.31.1 | | `v0.31.1` | 2026-04-15 | Medium | ## What's Changed * Fix pandera[polars] import without pandas by @cosmicBboy in https://github.com/unionai-oss/pandera/pull/2291 **Full Changelog**: https://github.com/unionai-oss/pandera/compare/v0.31.0...v0.31.1 | | `v0.31.1` | 2026-04-15 | Medium | ## What's Changed * Fix pandera[polars] import without pandas by @cosmicBboy in https://github.com/unionai-oss/pandera/pull/2291 **Full Changelog**: https://github.com/unionai-oss/pandera/compare/v0.31.0...v0.31.1 | | `v0.31.1` | 2026-04-15 | Medium | ## What's Changed * Fix pandera[polars] import without pandas by @cosmicBboy in https://github.com/unionai-oss/pandera/pull/2291 **Full Changelog**: https://github.com/unionai-oss/pandera/compare/v0.31.0...v0.31.1 | | `v0.31.1` | 2026-04-15 | Medium | ## What's Changed * Fix pandera[polars] import without pandas by @cosmicBboy in https://github.com/unionai-oss/pandera/pull/2291 **Full Changelog**: https://github.com/unionai-oss/pandera/compare/v0.31.0...v0.31.1 | | `v0.31.1` | 2026-04-15 | Medium | ## What's Changed * Fix pandera[polars] import without pandas by @cosmicBboy in https://github.com/unionai-oss/pandera/pull/2291 **Full Changelog**: https://github.com/unionai-oss/pandera/compare/v0.31.0...v0.31.1 | | `v0.31.1` | 2026-04-15 | Medium | ## What's Changed * Fix pandera[polars] import without pandas by @cosmicBboy in https://github.com/unionai-oss/pandera/pull/2291 **Full Changelog**: https://github.com/unionai-oss/pandera/compare/v0.31.0...v0.31.1 | | `v0.31.1` | 2026-04-15 | Medium | ## What's Changed * Fix pandera[polars] import without pandas by @cosmicBboy in https://github.com/unionai-oss/pandera/pull/2291 **Full Changelog**: https://github.com/unionai-oss/pandera/compare/v0.31.0...v0.31.1 | | `v0.31.1` | 2026-04-15 | Medium | ## What's Changed * Fix pandera[polars] import without pandas by @cosmicBboy in https://github.com/unionai-oss/pandera/pull/2291 **Full Changelog**: https://github.com/unionai-oss/pandera/compare/v0.31.0...v0.31.1 | ## Citation - HTML: https://www.freshcrate.ai/projects/pandera - Markdown: https://www.freshcrate.ai/projects/pandera.md - Dependencies JSON: https://www.freshcrate.ai/api/projects/pandera/deps _Generated by freshcrate.ai. Indexes pypi releases for AI-agent ecosystem packages._