py-uproot3 (spack): ROOT I/O in pure Python and Numpy. uproot is a reader and a writer of the ROOT file format using only 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. 
Keywords: analysis|big-data|bigdata|file-format|hep|hep-ex|numpy|python|python3|root|root-cern|scikit-hep