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So I created a python 2.7 env "gdsenv" using anaconda:

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Then I installed the jupyter kernel:

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...so far it seems good.

The problem is that if I open jupyter-notebook, I don't get python 2.7 option (I have python 3.5 installed on another env):

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Why is that and how can I fix that ?

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See if you can install an ipython kernel for python2.

I don't have anaconda installed, but here's how it works for a virtual environment created with python2 -m virtualenv jupyter-test:

  1. Install jupyter:
    python2 -m pip install jupyter
  2. Install ipython kernel for python2:
    python2 -m pip install ipykernel
    python2 -m ipykernel install --user
  3. Start jupyter not[![ebook
    jupyter notebook][1]][1]

You should now be able to create a python2 kernel:

Python 2 Notebook

See also this question which seems related: Using both Python 2.x and Python 3.x in IPython Notebook .

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Thanks a lot for this helpful answer ! I will try it out. :)

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