Jupyter using the wrong version of python

Question

Hi I've installed python 2.7 but did not remove 2.6. i've added 2.7 to the path and also as an alias but it seems like when I do jupyter notebook it tries to access 2.6

> jupyter notebook
Traceback (most recent call last):
File "jupyter-notebook", line 7, in <module>
 from notebook.notebookapp import main
 File "/usr/lib/python2.6/site-packages/notebook/__init__.py", line 25, in <module>
from .nbextensions import install_nbextension
File "/usr/lib/python2.6/site-packages/notebook/nbextensions.py", line 226, in  <module>
from traitlets import Bool, Enum, Unicode
File "/usr/lib/python2.6/site-packages/traitlets/__init__.py", line 1, in <module>
from .traitlets import *
File "/usr/lib/python2.6/site-packages/traitlets/traitlets.py", line 1291
return {n: t for (n, t) in cls.class_traits(**metadata).items()
               ^

My python version seems to point to 2.7

$ python --version
Python 2.7.6

as well as my which python seems to give the right out put :

$ which python
alias python='/usr/local/bin/python2.7'
/usr/local/bin/python2.7

I have pip installed for both versions of python. I am not sure how to fix this :(

lmtx · Accepted Answer · 2016-06-09 07:33:58Z

16

It could be a problem in your python kernel.json configuration. For example my python kernel is located at:

/usr/local/share/jupyter/kernels/python/kernel.json

and contains:

    {
     "language": "python",
     "display_name": "Python 2.7",
     "argv": [
      "/usr/local/bin/python2.7",
      "-m",
      "ipykernel",
      "-f",
      "{connection_file}"
     ]
    }

Make sure that the path in argv section points to correct version of python.

answered Jun 9, 2016 at 7:33

lmtx

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4 Comments

Steve3p0 Over a year ago

This was helpful. For Windows users, the path to your kernel.json might be something like this: C:\Users[username]\AppData\Roaming\jupyter\kernels\pythonX where x is python 2 or 3.

micsthepick Over a year ago

there is no kernels folder in AppData\Roaming\jupyter

Homero Esmeraldo Over a year ago

I didn't find any folder at /usr/local/share/jupyter/kernels/python/

Louis Yang Over a year ago

For me, it was at /usr/local/share/jupyter/kernels/python3/kernel.json. Note this file can be updated automatically by running ipython3 kernel install (and remember to log out and log in terminal after update).

micsthepick · Accepted Answer · 2023-07-23 06:58:43Z

3

It looks like you installed jupyter as an extension of /usr/lib/python2.6. If so, you'd have to uninstall jupyter and reinstall into your desired python.

/usr/lib/python2.6 -m pip uninstall jupyter && python -m pip install jupyter

edited Jul 23, 2023 at 6:58

micsthepick

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answered Feb 22, 2016 at 18:33

amos

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1 Comment

micsthepick Over a year ago

even after uninstalling jupyter and reinstalling in python 3.8, it's still trying to launch nonexistant "C:\program files\python37\python.exe"

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