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<img src="https://github.com/fatiando/pooch/raw/main/doc/_static/readme-banner.png" alt="Pooch: A friend to fetch your data files">
<p align="center">
<a href="https://www.fatiando.org/pooch"><strong>Documentation</strong> (latest)</a> •
<a href="https://www.fatiando.org/pooch/dev"><strong>Documentation</strong> (main branch)</a> •
<a href="https://github.com/fatiando/pooch/blob/main/CONTRIBUTING.md"><strong>Contributing</strong></a> •
<a href="https://www.fatiando.org/contact/"><strong>Contact</strong></a> •
<a href="https://github.com/orgs/fatiando/discussions"><strong>Ask a question</strong></a>
</p>
<p align="center">
Part of the <a href="https://www.fatiando.org"><strong>Fatiando a Terra</strong></a> project
</p>
<p align="center">
<a href="https://pypi.python.org/pypi/pooch"><img src="http://img.shields.io/pypi/v/pooch.svg?style=flat-square" alt="Latest version on PyPI"></a>
<a href="https://github.com/conda-forge/pooch-feedstock"><img src="https://img.shields.io/conda/vn/conda-forge/pooch.svg?style=flat-square" alt="Latest version on conda-forge"></a>
<a href="https://codecov.io/gh/fatiando/pooch"><img src="https://img.shields.io/codecov/c/github/fatiando/pooch/main.svg?style=flat-square" alt="Test coverage status"></a>
<a href="https://pypi.python.org/pypi/pooch"><img src="https://img.shields.io/pypi/pyversions/pooch.svg?style=flat-square" alt="Compatible Python versions."></a>
<a href="https://doi.org/10.21105/joss.01943"><img src="https://img.shields.io/badge/doi-10.21105%2Fjoss.01943-blue?style=flat-square" alt="DOI used to cite Pooch"></a>
</p>
## About
> Just want to download a file without messing with `requests` and `urllib`?
> Trying to add sample datasets to your Python package?
> **Pooch is here to help!**
*Pooch* is a **Python library** that can manage data by **downloading files**
from a server (only when needed) and storing them locally in a data **cache**
(a folder on your computer).
* Pure Python and minimal dependencies.
* Download files over HTTP, FTP, and from data repositories like Zenodo and figshare.
* Built-in post-processors to unzip/decompress the data after download.
* Designed to be extended: create custom downloaders and post-processors.
Are you a **scientist** or researcher? Pooch can help you too!
* Host your data on a repository and download using the DOI.
* Automatically download data using code instead of telling colleagues to do it themselves.
* Make sure everyone running the code has the same version of the data files.
## Projects using Pooch
[SciPy](https://github.com/scipy/scipy),
[scikit-image](https://github.com/scikit-image/scikit-image),
[xarray](https://github.com/pydata/xarray),
[Ensaio](https://github.com/fatiando/ensaio),
[GemPy](https://github.com/cgre-aachen/gempy),
[MetPy](https://github.com/Unidata/MetPy),
[napari](https://github.com/napari/napari),
[Satpy](https://github.com/pytroll/satpy),
[yt](https://github.com/yt-project/yt),
[PyVista](https://github.com/pyvista/pyvista),
[icepack](https://github.com/icepack/icepack),
[histolab](https://github.com/histolab/histolab),
[seaborn-image](https://github.com/SarthakJariwala/seaborn-image),
[Open AR-Sandbox](https://github.com/cgre-aachen/open_AR_Sandbox),
[climlab](https://github.com/climlab/climlab),
[mne-python](https://github.com/mne-tools/mne-python),
[GemGIS](https://github.com/cgre-aachen/gemgis),
[SHTOOLS](https://github.com/SHTOOLS/SHTOOLS),
[MOABB](https://github.com/NeuroTechX/moabb),
[GeoViews](https://github.com/holoviz/geoviews),
[ScopeSim](https://github.com/AstarVienna/ScopeSim),
[Brainrender](https://github.com/brainglobe/brainrender),
[pyxem](https://github.com/pyxem/pyxem),
[cellfinder](https://github.com/brainglobe/cellfinder),
[PVGeo](https://github.com/OpenGeoVis/PVGeo),
[geosnap](https://github.com/oturns/geosnap),
[BioCypher](https://github.com/biocypher/biocypher),
[cf-xarray](https://github.com/xarray-contrib/cf-xarray),
[Scirpy](https://github.com/scverse/scirpy),
[rembg](https://github.com/danielgatis/rembg),
[DASCore](https://github.com/DASDAE/dascore),
[scikit-mobility](https://github.com/scikit-mobility/scikit-mobility),
[Py-ART](https://github.com/ARM-DOE/pyart),
[HyperSpy](https://github.com/hyperspy/hyperspy),
[RosettaSciIO](https://github.com/hyperspy/rosettasciio),
[eXSpy](https://github.com/hyperspy/exspy),
[SPLASH](https://github.com/Adam-Boesky/astro_SPLASH),
[xclim](https://github.com/Ouranosinc/xclim),
[CLISOPS](https://github.com/roocs/clisops),
[scXpand](https://github.com/yizhak-lab-ccg/scXpand)
> If you're using Pooch, **send us a pull request** adding your project to the list.
## Example
For a **scientist downloading a data file** for analysis:
```python
import pooch
import pandas as pd
# Download a file and save it locally, returning the path to it.
# Running this again will not cause a download. Pooch will check the hash
# (checksum) of the downloaded file against the given value to make sure
# it's the right file (not corrupted or outdated).
fname_bathymetry = pooch.retrieve(
url="https://github.com/fatiando-data/caribbean-bathymetry/releases/download/v1/caribbean-bathymetry.csv.xz",
known_hash="md5:a7332aa6e69c77d49d7fb54b764caa82",
)
# Pooch can also download based on a DOI from certain providers.
fname_gravity = pooch.retrieve(
url="doi:10.5281/zenodo.5882430/southern-africa-gravity.csv.xz",
known_hash="md5:1dee324a14e647855366d6eb01a1ef35",
)
# Load the data with Pandas
data_bathymetry = pd.read_csv(fname_bathymetry)
data_gravity = pd.read_csv(fname_gravity)
```
For **package developers** including sample data in their projects:
```python
"""
Module mypackage/datasets.py
"""
from importlib import resources
import pandas
import pooch
# Get the version string from your project. You have one of these, right?
from . import version
# Create a new friend to manage your sample data storage
GOODBOY = pooch.create(
# Folder where the data will be stored. For a sensible default, use the
# default cache folder for your OS.
path=pooch.os_cache("mypackage"),
# Base URL of the remote data store. Will call .format on this string
# to insert the version (see below).
base_url="https://github.com/myproject/mypackage/raw/{version}/data/",
# Pooches are versioned so that you can use multiple versions of a
# package simultaneously. Use PEP440 compliant version number. The
# version will be appended to the path.
version=version,
# If a version as a "+XX.XXXXX" suffix, we'll assume that this is a dev
# version and replace the version with this string.
version_dev="main",
# An environment variable that overwrites the path.
env="MYPACKAGE_DATA_DIR",
# The cache file registry. A dictionary with all files managed by this
# pooch. Keys are the file names (relative to *base_url*) and values
# are their respective SHA256 hashes. Files will be downloaded
# automatically when needed (see fetch_gravity_data).
registry={"gravity-data.csv": "89y10phsdwhs09whljwc09whcowsdhcwodcydw"}
)
# You can also load the registry from a file. Each line contains a file
# name and it's sha256 hash separated by a space. This makes it easier to
# manage large numbers of data files. The registry file should be packaged
# and distributed with your software.
GOODBOY.load_registry(
resources.open_text("mypackage", "registry.txt")
)
# Define functions that your users can call to get back the data in memory
def fetch_gravity_data():
"""
Load some sample gravity data to use in your docs.
"""
# Fetch the path to a file in the local storage. If it's not there,
# we'll download it.
fname = GOODBOY.fetch("gravity-data.csv")
# Load it with numpy/pandas/etc
data = pandas.read_csv(fname)
return data
```
## Getting involved
🗨️ **Contact us:**
Find out more about how to reach us at
[fatiando.org/contact](https://www.fatiando.org/contact/).
👩🏾💻 **Contributing to project development:**
Please read our
[Contributing Guide](https://github.com/fatiando/pooch/blob/main/CONTRIBUTING.md)
to see how you can help and give feedback.
🧑🏾🤝🧑🏼 **Code of conduct:**
This project is released with a
[Code of Conduct](https://github.com/fatiando/community/blob/main/CODE_OF_CONDUCT.md).
By participating in this project you agree to abide by its terms.
> **Imposter syndrome disclaimer:**
> We want your help. **No, really.** There may be a little voice inside your
> head that is telling you that you're not ready, that you aren't skilled
> enough to contribute. We assure you that the little voice in your head is
> wrong. Most importantly, **there are many valuable ways to contribute besides
> writing code**.
>
> *This disclaimer was adapted from the*
> [MetPy project](https://github.com/Unidata/MetPy).
## License
This is free software: you can redistribute it and/or modify it under the terms
of the **BSD 3-clause License**. A copy of this license is provided in
[`LICENSE.txt`](https://github.com/fatiando/pooch/blob/main/LICENSE.txt).
|
