I'm trying to use Cython in a Jupyter Notebook but keep encountering an error along the lines of ImportError: dynamic module does not define module export function (PyInit__cython_magic_82a8b66e5f67c5dfa3ef71998eb9b501) (full error message at the end).
Is there something I can configure in Jupyter, Cython, Python, or elsewhere that might get Cython working for me here?
My notebook looks like:
%load_ext Cython
%%cython
cpdef int a = 0
for i in range(10):
a += i
print(a)
I'm running Python 3.6.8, Cython 0.29.21 and Jupyter Notebook 5.7.8 from an Anaconda install, on a Windows 10 (64 bit) computer.
To install Cython I followed the instructions here: 1. install Cython to my environment with conda intall cython; 2. install Visual Studio Build Tools with the specified components; 3. copy rc.exe and rcdll.dll to C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin. I've previously had Cython working on another computer following the same instructions.
Changing the code below the %%cython magic changes the string at the end of the error message (e.g. changing to a=1 produces (PyInit__cython_magic_0be2696ff7de958048f532034feee7fd)), but nothing else.
I've tried searching for other questions with the same error, but most results are for ImportError: dynamic module does not define init function. This question (and these other questions 1, 2) has a similar module export function issue as me, but isn't using Jupyter, so I'm not sure how to translate the solution to my situation (if it even is the same issue).
Full error message:
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-9-5e6525b05fe4> in <module>
----> 1 get_ipython().run_cell_magic('cython', '', 'cpdef int a = 0\nfor i in range(10):\n a += i\nprint(a)\n')
C:\Anaconda\envs\stable\lib\site-packages\IPython\core\interactiveshell.py in run_cell_magic(self, magic_name, line, cell)
2360 with self.builtin_trap:
2361 args = (magic_arg_s, cell)
-> 2362 result = fn(*args, **kwargs)
2363 return result
2364
<decorator-gen-129> in cython(self, line, cell)
C:\Anaconda\envs\stable\lib\site-packages\IPython\core\magic.py in <lambda>(f, *a, **k)
185 # but it's overkill for just that one bit of state.
186 def magic_deco(arg):
--> 187 call = lambda f, *a, **k: f(*a, **k)
188
189 if callable(arg):
C:\Anaconda\envs\stable\lib\site-packages\Cython\Build\IpythonMagic.py in cython(self, line, cell)
349 return None
350
--> 351 module = imp.load_dynamic(module_name, module_path)
352 self._import_all(module)
353
C:\Anaconda\envs\stable\lib\imp.py in load_dynamic(name, path, file)
341 spec = importlib.machinery.ModuleSpec(
342 name=name, loader=loader, origin=path)
--> 343 return _load(spec)
344
345 else:
C:\Anaconda\envs\stable\lib\importlib\_bootstrap.py in _load(spec)
C:\Anaconda\envs\stable\lib\importlib\_bootstrap.py in _load_unlocked(spec)
C:\Anaconda\envs\stable\lib\importlib\_bootstrap.py in module_from_spec(spec)
C:\Anaconda\envs\stable\lib\importlib\_bootstrap_external.py in create_module(self, spec)
C:\Anaconda\envs\stable\lib\importlib\_bootstrap.py in _call_with_frames_removed(f, *args, **kwds)
ImportError: dynamic module does not define module export function (PyInit__cython_magic_82a8b66e5f67c5dfa3ef71998eb9b501)
