Opened 3 hours ago
Closed 3 hours ago
#20570 closed defect (fixed)
Error reading netcdf with numpy2: AttributeError: 'MaskedArray' object has no attribute 'tostring'
| Reported by: | Owned by: | Tom Goddard | |
|---|---|---|---|
| Priority: | normal | Milestone: | |
| Component: | Input/Output | Version: | |
| Keywords: | Cc: | ||
| Blocked By: | Blocking: | ||
| Notify when closed: | Platform: | all | |
| Project: | ChimeraX |
Description
The following bug report has been submitted:
Platform: macOS-26.5.2-arm64-arm-64bit
ChimeraX Version: 1.13.dev202606302219 (2026-06-30 22:19:15 UTC)
Description
Reading netcdf file with numpy 2 gives this error.
Log:
UCSF ChimeraX version: 1.13.dev202606302219 (2026-06-30)
© 2016-2026 Regents of the University of California. All rights reserved.
How to cite UCSF ChimeraX
> open /Users/goddard/ucsf/data/formats/netcdf_june14.Bar12.1.n39.nc format
> netcdfmap
Traceback (most recent call last):
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/ui/widgets/htmlview.py", line 316, in interceptRequest
self._callback(info)
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/ui/widgets/htmlview.py", line 93, in _intercept
return interceptor(request_info, *args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/ui/widgets/htmlview.py", line 349, in intercept
chimerax_intercept(*args, view=view, session=session)
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/ui/widgets/htmlview.py", line 455, in chimerax_intercept
session.ui.thread_safe(defer, session, qurl.url(no_formatting), from_dir)
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/ui/gui.py", line 543, in thread_safe
func(*args, **kw)
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/ui/widgets/htmlview.py", line 442, in defer
cxcmd(session, topic)
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/ui/widgets/htmlview.py", line 464, in cxcmd
run(session, cmd)
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/core/commands/run.py", line 49, in run
results = command.run(text, log=log, return_json=return_json)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/core/commands/cli.py", line 3245, in run
result = ci.function(session, **kw_args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/open_command/cmd.py", line 138, in cmd_open
models = Command(session, registry=registry).run(provider_cmd_text,
log=log)[0]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/core/commands/cli.py", line 3245, in run
result = ci.function(session, **kw_args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/open_command/cmd.py", line 212, in provider_open
models, status = collated_open(session, None, paths, data_format, _add_models,
log_errors,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/open_command/cmd.py", line 547, in collated_open
return remember_data_format()
^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/open_command/cmd.py", line 518, in remember_data_format
models, status = func(*func_args, **func_kw)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/map/__init__.py", line 183, in open
return open_map(session, path, format=_name, **kw)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/map/volume.py", line 3922, in open_map
grids = open_file(path, file_type = format, log = session.logger, **kw)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/map_data/fileformats.py", line 175, in open_file
data.extend(open_func(p, **okw))
^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/map_data/netcdf/__init__.py", line 24, in open
return read_netcdf(path)
^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/map_data/netcdf/netcdf_grid.py", line 51, in read_netcdf
d = NetCDF_Data(path)
^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/map_data/netcdf/netcdf_format.py", line 44, in __init__
self.component_name = self.read_component_name(f)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/map_data/netcdf/netcdf_format.py", line 119, in
read_component_name
comp_name = v[:].tostring()
^^^^^^^^^^^^^
AttributeError: 'MaskedArray' object has no attribute 'tostring'
AttributeError: 'MaskedArray' object has no attribute 'tostring'
File
"/Users/goddard/ucsf/chimerax/ChimeraX.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-
packages/chimerax/map_data/netcdf/netcdf_format.py", line 119, in
read_component_name
comp_name = v[:].tostring()
^^^^^^^^^^^^^
See log for complete Python traceback.
OpenGL version: 4.1 Metal - 90.5
OpenGL renderer: Apple M2 Ultra
OpenGL vendor: Apple
Python: 3.11.9
Locale: en_US.UTF-8
Qt version: PyQt6 6.11.0, Qt 6.11.0
Qt runtime version: 6.11.1
Qt platform: cocoa
Hardware:
Hardware Overview:
Model Name: Mac Studio
Model Identifier: Mac14,14
Model Number: Z1800003VLL/A
Chip: Apple M2 Ultra
Total Number of Cores: 24 (16 Performance and 8 Efficiency)
Memory: 64 GB
System Firmware Version: 18000.121.3
OS Loader Version: 18000.121.3
Software:
System Software Overview:
System Version: macOS 26.5.2 (25F84)
Kernel Version: Darwin 25.5.0
Time since boot: 1 day, 19 hours, 8 minutes
Graphics/Displays:
Apple M2 Ultra:
Chipset Model: Apple M2 Ultra
Type: GPU
Bus: Built-In
Total Number of Cores: 60
Vendor: Apple (0x106b)
Metal Support: Metal 4
Displays:
PHL 278B1:
Resolution: 3840 x 2160 (2160p/4K UHD 1 - Ultra High Definition)
UI Looks like: 1920 x 1080 @ 60.00Hz
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Installed Packages:
accessible-pygments: 0.0.5
aiohappyeyeballs: 2.6.2
aiohttp: 3.13.4
aiosignal: 1.4.0
alabaster: 1.0.0
annotated-types: 0.7.0
anyio: 4.14.1
appdirs: 1.4.4
appnope: 0.1.4
asttokens: 3.0.1
attrs: 26.1.0
babel: 2.18.0
beautifulsoup4: 4.13.5
blockdiag: 3.0.0
blosc2: 4.7.0
build: 1.5.0
certifi: 2025.8.3
cftime: 1.6.5
charset-normalizer: 3.4.7
ChimeraX-AddCharge: 1.5.20
ChimeraX-AddH: 2.3.1
ChimeraX-AlignmentAlgorithms: 2.0.2
ChimeraX-AlignmentHdrs: 3.6.2
ChimeraX-AlignmentMatrices: 2.1
ChimeraX-Alignments: 3.2.2
ChimeraX-AlphaFold: 1.0.1
ChimeraX-AltlocExplorer: 1.2
ChimeraX-AmberInfo: 1.0
ChimeraX-Animations: 1.0
ChimeraX-Aniso: 1.3.2
ChimeraX-Arrays: 1.1
ChimeraX-Atomic: 1.69.2
ChimeraX-AtomicLibrary: 14.4.1
ChimeraX-AtomSearch: 2.0.1
ChimeraX-AxesPlanes: 2.4
ChimeraX-BasicActions: 1.1.3
ChimeraX-BILD: 1.0
ChimeraX-BlastProtein: 3.0.0
ChimeraX-Boltz: 1.1
ChimeraX-BondRot: 2.0.4
ChimeraX-BugReporter: 1.0.2
ChimeraX-BuildStructure: 2.13.1
ChimeraX-Bumps: 1.0
ChimeraX-BundleBuilder: 1.6.0
ChimeraX-ButtonPanel: 1.0.1
ChimeraX-CageBuilder: 1.0.1
ChimeraX-CellPack: 1.0
ChimeraX-Centroids: 1.4.1
ChimeraX-ChangeChains: 1.1
ChimeraX-CheckWaters: 1.5
ChimeraX-ChemGroup: 2.0.2
ChimeraX-Clashes: 2.4
ChimeraX-Cluster: 1.0
ChimeraX-ColorActions: 1.0.5
ChimeraX-ColorGlobe: 1.0
ChimeraX-ColorKey: 1.5.8
ChimeraX-CommandLine: 1.3.1
ChimeraX-ConnectStructure: 2.0.1
ChimeraX-Contacts: 1.0.1
ChimeraX-Core: 1.13.dev202606302219
ChimeraX-CoreFormats: 1.2
ChimeraX-coulombic: 1.4.6
ChimeraX-Crosslinks: 1.0
ChimeraX-Crystal: 1.0
ChimeraX-CrystalContacts: 1.0.1
ChimeraX-DAQplugin: 1.0.0
ChimeraX-DataFormats: 1.2.4
ChimeraX-DistMonitor: 1.4.2
ChimeraX-DockPrep: 1.2.2
ChimeraX-Dssp: 2.0
ChimeraX-EMDB-SFF: 1.0
ChimeraX-ESMFold: 1.0
ChimeraX-FileHistory: 1.0.1
ChimeraX-FunctionKey: 1.0.1
ChimeraX-Geometry: 1.3
ChimeraX-gltf: 1.0
ChimeraX-Graphics: 1.4.1
ChimeraX-Hbonds: 2.5.4
ChimeraX-Help: 1.3
ChimeraX-HKCage: 1.3
ChimeraX-IHM: 1.1
ChimeraX-ImageFormats: 1.2
ChimeraX-IMOD: 1.0
ChimeraX-IO: 1.0.4
ChimeraX-ItemsInspection: 1.0.1
ChimeraX-IUPAC: 1.0
ChimeraX-KVFinder: 1.8.3
ChimeraX-Label: 1.5
ChimeraX-LightingGUI: 1.0
ChimeraX-ListInfo: 1.3.1
ChimeraX-Log: 1.2.2
ChimeraX-LookingGlass: 1.1
ChimeraX-Maestro: 1.9.3
ChimeraX-Map: 1.3
ChimeraX-MapData: 2.0
ChimeraX-MapEraser: 1.0.1
ChimeraX-MapFilter: 2.0.1
ChimeraX-MapFit: 2.0
ChimeraX-MapSeries: 2.1.1
ChimeraX-Markers: 1.0.1
ChimeraX-Mask: 1.0.2
ChimeraX-MatchAlign: 1.2.1
ChimeraX-MatchMaker: 2.4.1
ChimeraX-MCopy: 1.0
ChimeraX-MCPServer: 0.2.0
ChimeraX-MDcrds: 2.19.1
ChimeraX-Meeting: 1.0.1
ChimeraX-Minimize: 1.4.2
ChimeraX-MLP: 1.1.1
ChimeraX-mmCIF: 2.17
ChimeraX-MMTF: 2.2
ChimeraX-ModelArchive: 1.0
ChimeraX-Modeller: 1.5.24
ChimeraX-ModelPanel: 1.6.1
ChimeraX-ModelSeries: 1.0.1
ChimeraX-Mol2: 2.0.3
ChimeraX-Mole: 1.0
ChimeraX-Morph: 1.0.2
ChimeraX-MouseModes: 1.2
ChimeraX-Movie: 1.0.1
ChimeraX-MutationScores: 1.0
ChimeraX-Neuron: 1.0
ChimeraX-NMRSTAR: 1.0.2
ChimeraX-Nucleotides: 2.0.3
ChimeraX-OpenCommand: 1.16.2
ChimeraX-OpenFold: 1.0
ChimeraX-OrthoPick: 1.0.1
ChimeraX-PDB: 2.7.13
ChimeraX-PDBBio: 1.0.1
ChimeraX-PDBLibrary: 1.0.5
ChimeraX-PDBMatrices: 1.0
ChimeraX-PickBlobs: 1.0.1
ChimeraX-Positions: 1.0
ChimeraX-PresetMgr: 1.1.4
ChimeraX-ProfileGrids: 1.10.2
ChimeraX-ProNA3D: 0.1
ChimeraX-PubChem: 2.2
ChimeraX-ReadPbonds: 1.0.1
ChimeraX-Registration: 1.1.2
ChimeraX-RemoteControl: 1.0
ChimeraX-RenderByAttr: 1.8.2
ChimeraX-RenumberResidues: 1.1
ChimeraX-ResidueFit: 1.0.1
ChimeraX-RestServer: 1.3.3
ChimeraX-RNALayout: 1.0
ChimeraX-RotamerLibMgr: 4.0
ChimeraX-RotamerLibsDunbrack: 2.0
ChimeraX-RotamerLibsDynameomics: 2.0
ChimeraX-RotamerLibsRichardson: 2.0
ChimeraX-SaveCommand: 1.5.2
ChimeraX-Scenes: 0.3.1
ChimeraX-SchemeMgr: 1.0
ChimeraX-SDF: 2.0.3
ChimeraX-Segger: 1.0
ChimeraX-Segment: 1.0.1
ChimeraX-Segmentations: 3.5.12
ChimeraX-SelInspector: 1.0
ChimeraX-SeqView: 2.19.1
ChimeraX-Shape: 1.1
ChimeraX-Shell: 1.0.1
ChimeraX-Shortcuts: 1.2.1
ChimeraX-ShowSequences: 1.0.3
ChimeraX-SideView: 1.0.1
ChimeraX-SimilarStructures: 1.0.1
ChimeraX-Smiles: 2.1.2
ChimeraX-SmoothLines: 1.0
ChimeraX-SNFG: 1.0
ChimeraX-SpaceNavigator: 1.0
ChimeraX-StdCommands: 1.20
ChimeraX-STL: 1.0.1
ChimeraX-Storm: 1.0
ChimeraX-StructMeasure: 1.2.1
ChimeraX-Struts: 1.0.1
ChimeraX-Surface: 1.0.1
ChimeraX-SwapAA: 2.0.1
ChimeraX-SwapRes: 2.5.3
ChimeraX-TapeMeasure: 1.0
ChimeraX-TaskManager: 1.0
ChimeraX-Test: 1.0
ChimeraX-Toolbar: 1.2.4
ChimeraX-ToolshedUtils: 1.2.4
ChimeraX-Topography: 1.0
ChimeraX-ToQuest: 1.0
ChimeraX-Tug: 1.0.1
ChimeraX-UI: 1.52
ChimeraX-Umap: 1.0
ChimeraX-uniprot: 2.3.2
ChimeraX-UnitCell: 1.0.1
ChimeraX-ViewDock: 1.6.4
ChimeraX-VIPERdb: 1.0
ChimeraX-Vive: 1.1
ChimeraX-VolumeMenu: 1.0.1
ChimeraX-vrml: 1.0
ChimeraX-VTK: 1.0
ChimeraX-WavefrontOBJ: 1.0
ChimeraX-WebCam: 1.0.2
ChimeraX-WebServices: 1.1.5
ChimeraX-Zone: 1.0.1
click: 8.4.2
colorama: 0.4.6
comm: 0.2.3
contourpy: 1.3.3
coverage: 7.14.3
cxservices: 1.2.3
cycler: 0.12.1
Cython: 3.2.4
debugpy: 1.8.21
decorator: 5.3.1
docutils: 0.21.2
executing: 2.2.1
filelock: 3.19.1
flatbuffers: 25.12.19
fonttools: 4.63.0
frozenlist: 1.8.0
funcparserlib: 2.0.0a0
glfw: 2.10.0
grako: 3.16.5
h11: 0.16.0
h5py: 3.16.0
html2text: 2025.4.15
httpcore: 1.0.9
httpx: 0.28.1
httpx-sse: 0.4.3
idna: 3.18
ihm: 2.2
imagecodecs: 2024.6.1
imagesize: 2.0.0
iniconfig: 2.3.0
ipykernel: 7.3.0
ipython: 9.14.1
ipython_pygments_lexers: 1.1.1
jedi: 0.20.0
Jinja2: 3.1.6
jsonschema: 4.26.0
jsonschema-specifications: 2025.9.1
jupyter_client: 8.9.1
jupyter_core: 5.9.1
kiwisolver: 1.5.0
line_profiler: 5.0.0
llvmlite: 0.47.0
lxml: 6.0.2
lz4: 4.3.2
Markdown: 3.8.2
markdown-it-py: 4.2.0
MarkupSafe: 3.0.3
matplotlib: 3.10.7
matplotlib-inline: 0.2.2
mcp: 1.18.0
mdurl: 0.1.2
mlx: 0.31.2
mlx-metal: 0.31.2
mrcfile: 1.5.4
msgpack: 1.1.1
multidict: 6.7.1
ndindex: 1.10.1
nest-asyncio2: 1.7.2
netCDF4: 1.7.4
networkx: 3.3
numba: 0.65.1
numexpr: 2.14.1
numpy: 2.4.6
onnxruntime: 1.26.0
OpenMM: 8.4.0
openvr: 1.26.701
packaging: 25.0
ParmEd: 4.2.2
parso: 0.8.7
pep517: 0.13.1
pexpect: 4.9.0
pickleshare: 0.7.5
pillow: 11.3.0
pip: 26.1.2
pkginfo: 1.12.1.2
platformdirs: 4.10.0
pluggy: 1.6.0
prompt_toolkit: 3.0.52
propcache: 0.5.2
protobuf: 7.34.1
psutil: 7.0.0
ptyprocess: 0.7.0
pure_eval: 0.2.3
py-cpuinfo: 9.0.0
pybind11: 3.0.1
pycollada: 0.8
pydantic: 2.13.4
pydantic-settings: 2.14.2
pydantic_core: 2.46.4
pydata-sphinx-theme: 0.19.0
Pygments: 2.18.0
pynmrstar: 3.5.1
PyOpenGL: 3.1.10
PyOpenGL-accelerate: 3.1.10
pyopenxr: 1.1.4501
pyparsing: 3.3.2
pyproject_hooks: 1.2.0
PyQt6: 6.11.0
PyQt6-Qt6: 6.11.1
PyQt6-WebEngine: 6.11.0
PyQt6-WebEngine-Qt6: 6.11.1
PyQt6_sip: 13.11.1
pytest: 9.1.1
pytest-cov: 7.1.0
python-dateutil: 2.9.0.post0
python-dotenv: 1.2.2
python-multipart: 0.0.32
pyzmq: 27.1.0
qtconsole: 5.7.2
QtPy: 2.4.3
qtshim: 1.2.2
RandomWords: 0.4.0
referencing: 0.37.0
requests: 2.32.5
rich: 15.0.0
roman-numerals: 4.1.0
rpds-py: 2026.6.3
scipy: 1.17.1
setuptools: 82.0.1
sfftk-rw: 0.8.1
six: 1.17.0
snowballstemmer: 3.1.1
sortedcontainers: 2.4.0
soupsieve: 2.8.4
Sphinx: 9.0.4
sphinx-autodoc-typehints: 3.6.1
sphinxcontrib-applehelp: 2.0.0
sphinxcontrib-blockdiag: 3.0.0
sphinxcontrib-devhelp: 2.0.0
sphinxcontrib-htmlhelp: 2.1.0
sphinxcontrib-jsmath: 1.0.1
sphinxcontrib-qthelp: 2.0.0
sphinxcontrib-serializinghtml: 2.0.0
sse-starlette: 3.4.5
stack-data: 0.6.3
starlette: 1.3.1
superqt: 0.7.6
tables: 3.11.1
threadpoolctl: 3.6.0
tifffile: 2025.3.13
tinyarray: 1.2.5
tornado: 6.5.7
traitlets: 5.15.1
typing-inspection: 0.4.2
typing_extensions: 4.15.0
urllib3: 2.7.0
uvicorn: 0.49.0
wcwidth: 0.8.2
webcolors: 24.11.1
wheel: 0.47.0
wheel-filename: 1.4.2
yarl: 1.24.2
Change History (2)
comment:1 by , 3 hours ago
| Component: | Unassigned → Input/Output |
|---|---|
| Owner: | set to |
| Platform: | → all |
| Project: | → ChimeraX |
| Status: | new → assigned |
| Summary: | ChimeraX bug report submission → Error reading netcdf with numpy2: AttributeError: 'MaskedArray' object has no attribute 'tostring' |
comment:2 by , 3 hours ago
| Resolution: | → fixed |
|---|---|
| Status: | assigned → closed |
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Fixed.
Replaced tostring() with tobytes().