cannot cache function: no locator available

[berceanu]

Using openPMD_viewer-1.0.1/dev and numba 0.51.2 inside a Python 3.8 miniconda environment, I get

from openpmd_viewer import ParticleTracker

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 618, in _load_backward_compatible
  File "<frozen zipimport>", line 259, in load_module
  File "/data/storage/berceanu/software/pkg/minicondapic/lib/python3.8/site-packages/openPMD_viewer-1.0.1-py3.8.egg/openpmd_viewer/__init__.py", line 9, in <module>
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 618, in _load_backward_compatible
  File "<frozen zipimport>", line 259, in load_module
  File "/data/storage/berceanu/software/pkg/minicondapic/lib/python3.8/site-packages/openPMD_viewer-1.0.1-py3.8.egg/openpmd_viewer/openpmd_timeseries/__init__.py", line 2, in <module>
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 618, in _load_backward_compatible
  File "<frozen zipimport>", line 259, in load_module
  File "/data/storage/berceanu/software/pkg/minicondapic/lib/python3.8/site-packages/openPMD_viewer-1.0.1-py3.8.egg/openpmd_viewer/openpmd_timeseries/main.py", line 13, in <module>
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 618, in _load_backward_compatible
  File "<frozen zipimport>", line 259, in load_module
  File "/data/storage/berceanu/software/pkg/minicondapic/lib/python3.8/site-packages/openPMD_viewer-1.0.1-py3.8.egg/openpmd_viewer/openpmd_timeseries/utilities.py", line 223, in <module>
  File "/data/storage/berceanu/software/pkg/minicondapic/lib/python3.8/site-packages/numba/core/decorators.py", line 211, in wrapper
    disp.enable_caching()
  File "/data/storage/berceanu/software/pkg/minicondapic/lib/python3.8/site-packages/numba/core/dispatcher.py", line 743, in enable_caching
    self._cache = FunctionCache(self.py_func)
  File "/data/storage/berceanu/software/pkg/minicondapic/lib/python3.8/site-packages/numba/core/caching.py", line 620, in __init__
    self._impl = self._impl_class(py_func)
  File "/data/storage/berceanu/software/pkg/minicondapic/lib/python3.8/site-packages/numba/core/caching.py", line 355, in __init__
    raise RuntimeError("cannot cache function %r: no locator available "
RuntimeError: cannot cache function 'histogram_cic_1d': no locator available for file '/data/storage/berceanu/software/pkg/minicondapic/lib/python3.8/site-packages/openPMD_viewer-1.0.1-py3.8.egg/openpmd_viewer/openpmd_timeseries/utilities.py'

[berceanu]

I installed openPMD-viewer by doing python setup.py install, so this might be relevant numba/numba#4908

[ax3l]

Yes, pip install . is definitely what you want to go with [credit @hightower8083 here] - it will generally have more logic included than calling just calling the setup python scripts.

Numba is a quite complex dependency and setuptools (aka calling setup.py) does not resolve all install logic necessarily - pip does.

is there a place in the openPMD-viewer docs where we write python setup.py install? If that is the case, please let us replace such occurrences for local builds with the modern and future-safe:

pip wheel .
pip install *whl

Sorry for this, this is something coming down from PyPA.

Important note: always update pip first, please. There are numerous breaking changes that landed and will land in the near future in pip that will affect most of the Python eco-system (keywords: PEP517, dependency resolver, etc.). We will try to stay ahead of the curve if you encounter issues with the latest pip releases (please report if so).

[berceanu]

is there a place in the openPMD-viewer docs where we write python setup.py install

Yes, inside CONTRIBUTING.md.