km3io 0.2.1

KM3NeT I/O without ROOT

This software provides a set of Python classes to read KM3NeT ROOT files without having ROOT, Jpp or aanet installed. It only depends on Python 3.5+ and the amazing uproot package and gives you access to the data via numpy arrays.

It’s very easy to use and according to the uproot benchmarks, it is able to outperform the ROOT I/O performance. To install it:

pip install km3io

Quick intro to read Jpp files

Currently only events (the KM3NET_EVENT tree) are supported but timeslices and summaryslices will be implemented very soon.

Let’s have a look at some ORCA data (KM3NeT_00000044_00005404.root)

To get a lazy ragged array of the events:

>>> import km3io as ki
>>> events = ki.JppReader("KM3NeT_00000044_00005404.root").events

That’s it! Now let’s have a look at the hits data:

>>> events
Number of events: 17023
>>> events[23].snapshot_hits.tot
array([28, 22, 17, 29,  5, 27, 24, 26, 21, 28, 26, 21, 26, 24, 17, 28, 23,
       29, 27, 24, 23, 26, 29, 25, 18, 28, 24, 28, 26, 20, 25, 31, 28, 23,
       26, 21, 30, 33, 27, 16, 23, 24, 19, 24, 27, 22, 23, 21, 25, 16, 28,
       22, 22, 29, 24, 29, 24, 24, 25, 25, 21, 31, 26, 28, 30, 42, 28],
      dtype=uint8)