Awesome Open Source
Awesome Open Source

A Statistical Data Testing Toolkit

A data validation library for scientists, engineers, and analysts seeking correctness.

CI Build Documentation Status PyPI version PyPI license pyOpenSci Project Status: Active – The project has reached a stable, usable state and is being actively developed. Documentation Status codecov PyPI pyversions DOI asv Downloads Downloads Conda Downloads Discord

pandera provides a flexible and expressive API for performing data validation on dataframes to make data processing pipelines more readable and robust.

Dataframes contain information that pandera explicitly validates at runtime. This is useful in production-critical or reproducible research settings. With pandera, you can:

  1. Define a schema once and use it to validate different dataframe types including pandas, dask, modin, and pyspark.
  2. Check the types and properties of columns in a DataFrame or values in a Series.
  3. Perform more complex statistical validation like hypothesis testing.
  4. Seamlessly integrate with existing data analysis/processing pipelines via function decorators.
  5. Define schema models with the class-based API with pydantic-style syntax and validate dataframes using the typing syntax.
  6. Synthesize data from schema objects for property-based testing with pandas data structures.
  7. Lazily Validate dataframes so that all validation checks are executed before raising an error.
  8. Integrate with a rich ecosystem of python tools like pydantic, fastapi, and mypy.


The official documentation is hosted on ReadTheDocs:


Using pip:

pip install pandera

Using conda:

conda install -c conda-forge pandera


Installing additional functionality:

pip install pandera[hypotheses]  # hypothesis checks
pip install pandera[io]          # yaml/script schema io utilities
pip install pandera[strategies]  # data synthesis strategies
pip install pandera[mypy]        # enable static type-linting of pandas
pip install pandera[fastapi]     # fastapi integration
pip install pandera[dask]        # validate dask dataframes
pip install pandera[pyspark]     # validate pyspark dataframes
pip install pandera[modin]       # validate modin dataframes
pip install pandera[modin-ray]   # validate modin dataframes with ray
pip install pandera[modin-dask]  # validate modin dataframes with dask
conda install -c conda-forge pandera-hypotheses  # hypothesis checks
conda install -c conda-forge pandera-io          # yaml/script schema io utilities
conda install -c conda-forge pandera-strategies  # data synthesis strategies
conda install -c conda-forge pandera-mypy        # enable static type-linting of pandas
conda install -c conda-forge pandera-fastapi     # fastapi integration
conda install -c conda-forge pandera-dask        # validate dask dataframes
conda install -c conda-forge pandera-pyspark     # validate pyspark dataframes
conda install -c conda-forge pandera-modin       # validate modin dataframes
conda install -c conda-forge pandera-modin-ray   # validate modin dataframes with ray
conda install -c conda-forge pandera-modin-dask  # validate modin dataframes with dask

Quick Start

import pandas as pd
import pandera as pa

# data to validate
df = pd.DataFrame({
    "column1": [1, 4, 0, 10, 9],
    "column2": [-1.3, -1.4, -2.9, -10.1, -20.4],
    "column3": ["value_1", "value_2", "value_3", "value_2", "value_1"]

# define schema
schema = pa.DataFrameSchema({
    "column1": pa.Column(int, checks=pa.Check.le(10)),
    "column2": pa.Column(float,,
    "column3": pa.Column(str, checks=[
        # define custom checks as functions that take a series as input and
        # outputs a boolean or boolean Series
        pa.Check(lambda s: s.str.split("_", expand=True).shape[1] == 2)

validated_df = schema(df)

#     column1  column2  column3
#  0        1     -1.3  value_1
#  1        4     -1.4  value_2
#  2        0     -2.9  value_3
#  3       10    -10.1  value_2
#  4        9    -20.4  value_1

Schema Model

pandera also provides an alternative API for expressing schemas inspired by dataclasses and pydantic. The equivalent SchemaModel for the above DataFrameSchema would be:

from pandera.typing import Series

class Schema(pa.SchemaModel):

    column1: Series[int] = pa.Field(le=10)
    column2: Series[float] = pa.Field(lt=-1.2)
    column3: Series[str] = pa.Field(str_startswith="value_")

    def column_3_check(cls, series: Series[str]) -> Series[bool]:
        """Check that values have two elements after being split with '_'"""
        return series.str.split("_", expand=True).shape[1] == 2


Development Installation

git clone
cd pandera
pip install -r requirements-dev.txt
pip install -e .


pip install pytest
pytest tests

Contributing to pandera GitHub contributors

All contributions, bug reports, bug fixes, documentation improvements, enhancements and ideas are welcome.

A detailed overview on how to contribute can be found in the contributing guide on GitHub.


Go here to submit feature requests or bugfixes.

Need Help?

There are many ways of getting help with your questions. You can ask a question on Github Discussions page or reach out to the maintainers and pandera community on Discord

Why pandera?

Alternative Data Validation Libraries

Here are a few other alternatives for validating Python data structures.

Generic Python object data validation

pandas-specific data validation

Other tools for data validation

How to Cite

If you use pandera in the context of academic or industry research, please consider citing the paper and/or software package.


@InProceedings{ niels_bantilan-proc-scipy-2020,
  author    = { {N}iels {B}antilan },
  title     = { pandera: {S}tatistical {D}ata {V}alidation of {P}andas {D}ataframes },
  booktitle = { {P}roceedings of the 19th {P}ython in {S}cience {C}onference },
  pages     = { 116 - 124 },
  year      = { 2020 },
  editor    = { {M}eghann {A}garwal and {C}hris {C}alloway and {D}illon {N}iederhut and {D}avid {S}hupe },
  doi       = { 10.25080/Majora-342d178e-010 }

Software Package


License and Credits

pandera is licensed under the MIT license and is written and maintained by Niels Bantilan ([email protected])

Alternative Project Comparisons
Related Awesome Lists
Top Programming Languages
Top Projects

Get A Weekly Email With Trending Projects For These Topics
No Spam. Unsubscribe easily at any time.
Python (807,156
Testing (93,963
Validation (20,375
Schema (14,726
Pandas (6,616
Dataframe (2,807
Testing Tools (1,640
Data Processing (674
Pandas Dataframe (552
Data Cleaning (423
Data Validation (257
Hypothesis Testing (145
Data Verification (7