scikit-hep/uproot5

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ROOT I/O in pure Python and NumPy.

Stars: 270
Forks: 102
Open beginner issues: 0
Indexed issues: 84
Avg merge: 12h 17m
Merged PRs (30d): 6

Dominant language: Python
License: BSD-3-Clause
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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84 open issues indexed

Support RNTuple attributes Open

feature

Difficulty 4/5 3-5 days Newbie friendliness 45/100

scikit-hep/uproot5#1721 · Opened Sep 14, 2026
RNTuple: top-level tuple fields do not round-trip as tuples Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

scikit-hep/uproot5#1714 · Opened Aug 27, 2026
RNTuple: optional records lose their optionality, turning None into [] Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

scikit-hep/uproot5#1713 · Opened Aug 27, 2026
awkward_pandas is outdated and AwkwardExtensionArray breaks HDF5 export Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 48/100

scikit-hep/uproot5#1706 · Opened Aug 18, 2026
GPT 5.6 Sol review of Uproot Open

bug performance

Difficulty 5/5 Over a week Newbie friendliness 25/100

scikit-hep/uproot5#1688 · Opened Jul 21, 2026
Consider moving away from cramjam Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

scikit-hep/uproot5#1685 · Opened Jul 17, 2026
Implement expression support for RNTuples Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

scikit-hep/uproot5#1673 · 8 comments · Opened Jul 2, 2026
Skimming with coffea and writing out RNTuples takes forever to read them back up Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 52/100

scikit-hep/uproot5#1637 · 8 comments · Opened May 31, 2026
Pylance complains about uproot.open Open

bug (unverified)

Difficulty 3/5 1-2 days Newbie friendliness 45/100

scikit-hep/uproot5#1608 · 2 comments · Opened Mar 26, 2026
`recreate()` opens remote sinks in `r+b` mode, breaking `simplecache::` write caching Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 38/100

scikit-hep/uproot5#1581 · Opened Feb 17, 2026
Add repository custom instructions for GitHub Copilot Open

feature

scikit-hep/uproot5#1549 · 1 assignee · Opened Jan 5, 2026
Maybe replace filename-handling with universal-pathlib? Open

feature

Difficulty 5/5 Over a week Newbie friendliness 35/100

scikit-hep/uproot5#1545 · 4 comments · Opened Jan 2, 2026
Forward slashes in object names break reading Open

bug (unverified)

Difficulty 3/5 1-2 days Newbie friendliness 45/100

scikit-hep/uproot5#1541 · 2 comments · 1 reaction · Opened Dec 16, 2025
2D PlottableHistogram with kind='MEAN' (i.e. 2D profile plots) not supported yet Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

scikit-hep/uproot5#1534 · 5 comments · Opened Dec 5, 2025
Writing profiles with storage=WeightedMean() Open

bug (unverified)

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scikit-hep/uproot5#1533 · 9 comments · Opened Dec 5, 2025
TypeError while reading branch containing vector of custom objects containing TArrayF Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scikit-hep/uproot5#1529 · 3 comments · Opened Nov 28, 2025
Incorrect writing of jagged arrays into a TTree Open

bug (unverified)

scikit-hep/uproot5#1490 · 23 comments · 1 assignee · Opened Aug 29, 2025
TTree/RNTuple attribute to keep track of the loaded branches Open

feature

scikit-hep/uproot5#1489 · 1 comment · 1 assignee · Opened Aug 29, 2025
Add a regression test for RNTuple PHYSLITE Open

tests

Difficulty 3/5 1-2 days Newbie friendliness 38/100

scikit-hep/uproot5#1471 · 1 reaction · Opened Jul 17, 2025
Issue with reading custom classes in TTree branches Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scikit-hep/uproot5#1455 · Opened Jul 3, 2025
Files passing through Cloudflare can no longer be read over http Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 20/100

scikit-hep/uproot5#1453 · 4 comments · 1 reaction · Opened Jun 19, 2025
Exception handling in uproot/source/coalesce.py Open

bug (unverified) cleanup

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scikit-hep/uproot5#1450 · 1 comment · Opened Jun 16, 2025
Reproducible ROOT files (`kReproducible`, `?reproducible`) Open

feature

Difficulty 4/5 3-5 days Newbie friendliness 38/100

scikit-hep/uproot5#1445 · Opened May 28, 2025
Need tool to get dask dataframes from config files Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

scikit-hep/uproot5#1441 · 11 comments · Opened May 18, 2025
Hide protected stuff from search results Open

docs

Difficulty 3/5 1-2 days Newbie friendliness 42/100

scikit-hep/uproot5#1440 · Opened May 18, 2025
uproot 8 times slower to open many histograms Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 38/100

scikit-hep/uproot5#1417 · 1 comment · Opened Apr 12, 2025
Improve of design of filtering of branches when concatenating Open

feature

scikit-hep/uproot5#1388 · 3 comments · 1 assignee · Opened Feb 23, 2025
NanoEventsFactory is not able to read RNTuple NanoAOD file in coffea 2025.1.1 Open

dependencies

scikit-hep/uproot5#1383 · 7 comments · 1 assignee · Opened Feb 19, 2025
RNTuple support Open

feature

scikit-hep/uproot5#1382 · 1 reaction · 1 assignee · Opened Feb 17, 2025
Can't `filter_typename` in `uproot.dask` Open

bug (unverified)

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scikit-hep/uproot5#1363 · 1 comment · Opened Jan 17, 2025
xrootd connections through dask not working Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scikit-hep/uproot5#1343 · Opened Nov 22, 2024
Usage of non-PlottableHistogram attributes `edges` in to_writeable Open

bug (unverified)

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

scikit-hep/uproot5#1339 · Opened Nov 16, 2024
Slow loading of file into arrays. Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scikit-hep/uproot5#1314 · 1 comment · Opened Oct 14, 2024
`ClientOSError` during repeat file read with `uproot.dask` Open

bug (unverified)

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scikit-hep/uproot5#1274 · 3 comments · Opened Aug 15, 2024
Unexpected number of partitions with multiple files Open

bug (unverified)

Difficulty 3/5 1-2 days Newbie friendliness 42/100

scikit-hep/uproot5#1273 · 1 comment · Opened Aug 15, 2024
Reading TNtuple into an array Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scikit-hep/uproot5#1270 · Opened Aug 13, 2024
Trying to parse the root file using rust and asking some questions. Open

feature

Difficulty 5/5 Over a week Newbie friendliness 20/100

scikit-hep/uproot5#1261 · 12 comments · Opened Aug 1, 2024
Setuptools import error with uproot4 Open

installation

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scikit-hep/uproot5#1259 · 2 comments · Opened Jul 30, 2024
uproot can not open files on dCache when 'https' protocol is used. Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scikit-hep/uproot5#1255 · 2 comments · Opened Jul 24, 2024
`uproot.recreate` and `uproot.update` are using the colon-parsing of `uproot.open`, but they shouldn't Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

scikit-hep/uproot5#1251 · 1 comment · Opened Jul 16, 2024
Passing SSLContext for the HTTPS+X509 to uproot.dask fails because the context is not serializable Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scikit-hep/uproot5#1248 · 8 comments · Opened Jul 11, 2024
test_0927_dont_assume_uproot_in_global_scope_in_TPython_Eval now raises an exception Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 30/100

scikit-hep/uproot5#1237 · 7 comments · Opened Jun 27, 2024
Reading files through HTTPS protocol results `TypeError: a bytes-like object is required, not 'ServerDisconnectedError'` Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 30/100

scikit-hep/uproot5#1233 · 10 comments · Opened Jun 20, 2024
Maybe add retry logic for failed remote data access Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

scikit-hep/uproot5#1219 · Opened May 14, 2024
File-opening functions (e.g. `uproot.open`) should complain about unrecognized arguments Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

scikit-hep/uproot5#1215 · Opened May 13, 2024
Task call time tracking for successful tasks with `uproot.dask` Open

feature

Difficulty 4/5 3-5 days Newbie friendliness 35/100

scikit-hep/uproot5#1211 · 1 comment · Opened May 9, 2024
ElementLink branch `EventInfoAuxDyn.hardScatterVertexLink` in PHYSLITE can't be read Open

bug (unverified)

Difficulty 3/5 1-2 days Newbie friendliness 35/100

scikit-hep/uproot5#1177 · 3 comments · Opened Mar 19, 2024
Sometimes inconsistent values in hist conversion from TProfile read via uproot Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 25/100

scikit-hep/uproot5#1175 · 2 comments · Opened Mar 19, 2024
`uproot.dask` is turning TBranches of fixed-size C arrays into Dask arrays with shape `(num_entries,)`, rather than `(num_entries, fixed_size)` Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

scikit-hep/uproot5#1173 · Opened Mar 18, 2024
Unable to open a specific tree: basket 1 in tree/branch xxx has the wrong number of bytes (yyy) for interpretation Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 28/100

scikit-hep/uproot5#1170 · 1 comment · Opened Mar 14, 2024

scikit-hep/uproot5

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