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ROOT I/O in pure Python and NumPy.

Project description

PyPI version Conda-Forge Python 3.8‒3.12 BSD-3 Clause License Continuous integration tests

Scikit-HEP NSF-1836650 DOI 10.5281/zenodo.4340632 Documentation Gitter

Uproot is a library for reading and writing ROOT files in pure Python and NumPy.

Unlike the standard C++ ROOT implementation, Uproot is only an I/O library, primarily intended to stream data into machine learning libraries in Python. Unlike PyROOT and root_numpy, Uproot does not depend on C++ ROOT. Instead, it uses Numpy to cast blocks of data from the ROOT file as Numpy arrays.

Installation

Uproot can be installed from PyPI using pip.

pip install uproot

Uproot is also available using conda.

conda install -c conda-forge uproot

If you have already added conda-forge as a channel, the -c conda-forge is unnecessary. Adding the channel is recommended because it ensures that all of your packages use compatible versions (see conda-forge docs):

conda config --add channels conda-forge
conda update --all

Getting help

Start with the tutorials and reference documentation.

Installation for developers

Uproot is an ordinary Python library; you can get a copy of the code with

git clone https://github.com/scikit-hep/uproot5.git

and install it locally by calling pip install -e . in the repository directory.

If you need to develop Awkward Array as well, see its installation for developers.

Dependencies

Uproot's only strict dependencies are NumPy and packaging. Strict dependencies are automatically installed by pip (or conda).

Awkward Array is highly recommended and is automatically installed by pip (or conda), though it is possible to use Uproot without it. If you need a minimal installation, pass --no-deps to pip and pass library="np" to every array-fetching function, or globally set uproot.default_library to get NumPy arrays instead of Awkward Arrays.

  • awkward: Uproot 5.x requires Awkward 2.x.

The following libraries are also useful in conjunction with Uproot, but are not necessary. If you call a function that needs one, you'll be prompted to install it. (Conda installs most of these automatically.)

For ROOT files, compressed different ways:

  • lz4 and xxhash: if reading ROOT files that have been LZ4-compressed.
  • zstandard: if reading ROOT files that have been ZSTD-compressed.
  • ZLIB and LZMA are built in (Python standard library).

For accessing remote files:

  • minio: if reading files with s3:// URIs.
  • xrootd: if reading files with root:// URIs.
  • HTTP/S access is built in (Python standard library).

For distributed computing with Dask:

For exporting TTrees to Pandas:

  • pandas: if library="pd".
  • awkward-pandas: if library="pd" and the data have irregular structure ("jagged" arrays), see awkward-pandas.

For exporting histograms:

  • boost-histogram: if converting histograms to boost-histogram with histogram.to_boost().
  • hist: if converting histograms to hist with histogram.to_hist().

Acknowledgements

Support for this work was provided by NSF cooperative agreements OAC-1836650 and PHY-2323298 (IRIS-HEP), grant OAC-1450377 (DIANA/HEP), and PHY-2121686 (US-CMS LHC Ops).

Thanks especially to the gracious help of Uproot contributors (including the original repository).

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