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How to make Jupyter Notebook look in the right place for a module?

cn flag
user1551817

Using a Jupyter Notebook running with the python2 kernel, I tried to import emcee and I got an error message:

File "/home/me/.local/lib/python2.7/site-packages/emcee/ensemble.py", line 84
    parameter_names: Optional[Union[Dict[str, int], List[str]]] = None,
                   ^
SyntaxError: invalid syntax

apparently because I am using the python2 kernel.

I then installed ipykernal using: python3 -m pip install ipykernel

I then opened a Jupyter Notebook using the Python3 kernel. I tried to import emcee but I had the same problem. It was still looking for the emcee module in the python2 path.

I then did pip3 install emcee, opened a Jupyter Notebook (python3 kernel) but I still have the same issue.

I think I need to tell Jupyter Notebook to look for the python3 version of emcee, but I'm not sure how to. I just tried:

export PYTHONPATH='/home/me/.local/lib/python3.6/site-packages/'

But again, this didn't fix it. I checked the sys.path in my Juoyter Notebook and the new python path didn't seem to be added.

Can someone tell me what I'm doing wrong please?

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avatar Ubuntu
cn flag
user1551817

The Jupyter Notebook wasn't really using the python3 kernel even though it said it was:

My python3 kernel was located: /home/damejia/.local/share/jupyter/kernels/python3

The kernel.json file was:

{
 "argv": [
  "python",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ],
 "display_name": "Python 3",
 "language": "python"
}

But "python" just points to my python2. I changed "python" to "python3" and everything worked.

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