Reading single basket over xrootd

[alexander-held]

The following attempts to read a single basket over xrootd and breaks for me:

import uproot

fname = "root://eospublic.cern.ch:1094//eos/opendata/atlas/rucio/mc20_13TeV/DAOD_PHYSLITE.37620644._000012.pool.root.1"
f = uproot.open({fname: "CollectionTree"})
f["AnalysisJetsAuxDyn.pt"].basket(0)

I am using these versions of software:

fsspec                            2026.2.0
fsspec-xrootd                     0.5.2
uproot                            5.7.1
xrootd                            5.9.1

Doing the same with a local file (after xrdcp) works fine.

[ariostas]

Just checked, and the issue is that branch.member("fBasketSeek")[basket_num] is a NumPy integer instead of a Python integer. I'll check why it ends up with a different type with xrootd.

EDIT: Actually, it's always a NumPy int. It's just that only xrootd cares if it's not a Python int.