MATLAB Answers

Failed to call python modules due to lack of 'core' in numba

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JiYuan Lee
JiYuan Lee on 31 Aug 2021
Commented: Yongjian Feng on 2 Sep 2021
I want to call python to caculate a high resolution infrared molecular spectra by radis.
First I run a test code by python, and test it in VS Code. It woked and printed right results with no errors.
But when I used to call python modules in matlab, An error happened: AttributeError: module 'numba' has no attribute 'core'.
Actually I can import core from numba in VS Code successfully.
Steps To Reproduce
Python Code:
# myfun.py
def test():
print('Hello,Matlab!')
def add(a, b):
c = a + b
return c
def test2():
from radis import calc_spectrum
from numba import core
s1 = calc_spectrum(
1900 ,
2000 ,
molecule="CO2",
isotope="1",
pressure=1.01325 ,
Tgas=500 ,
mole_fraction=0.1,
path_length=1 ,
databank="HITEMP2010-CO2",
verbose=False,
)
a = s1.get('abscoeff')
print(a)
if __name__ == '__main__':
a=test2()
Matlab Code:
[v, e, isloaded] = pyversion;
if isloaded
disp('To change the Python version, restart MATLAB, then call pyversion.')
else
pyversion('F:\Anaconda3\envs\radis-lab\python.exe')
end
if count(py.sys.path,' ') == 0 %Add file path to Python environment
insert(py.sys.path,int32(0),'');
end
py.print('Hello, Python!')
% reload module
clear classes
obj = py.importlib.import_module('myfun');
py.importlib.reload(obj);
py.myfun.test2()

Answers (1)

Yongjian Feng
Yongjian Feng on 31 Aug 2021
I would recommand the following steps to narrow down the issue:
  1. From the error message, it seems like matlab can find numba but can't find core. So first confirm this. Instead of importing core from numba, just import numba, and print its version. If successful, then it is indeed complaining about core, not numba.
  2. If numba can be imported, print its path. See which numba matlab actually imported. Make sure it is the correct one that you want to use. If not, play with PYTHONPATH env var to point to the correct one
  3. If numba can't be imported, play with PYTHONPATH env var to point to the correct one.
  7 Comments
Yongjian Feng
Yongjian Feng on 2 Sep 2021
Yes, as explained before, virtualenv is challenging. If it is possible, try without it.

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