jupyter notebook bad interpreter error message

Question

I tried to use jupyter notebook with kernel python3, but I got this error message.

anonymous$ jupyter notebook
/usr/local/opt/python/bin/python2.7: bad interpreter: No such file or directory

Information about python and pip installed on mac (i used pip3 to install jupyter ):

anonymous$ which -a python python2 python2.7 python3 python3.6
/usr/bin/python
/usr/bin/python2.7
/usr/local/bin/python3
/usr/local/bin/python3.6
anonymous$ which -a pip pip2 pip3
/usr/local/bin/pip
/usr/local/bin/pip3

Tried to solve it with "brew update && brew upgrade jupyter" as the other post suggested but did not work. Got an error message saying that "Error: jupyter not installed".

Answer 1

You must have installed jupyter with another package manager such as pip . You can try pip uninstall jupyter followed by brew install jupyter .

If you get the message:

Error: The `brew link` step did not complete successfully 
The formula built, but is not symlinked into /usr/local 
Could not symlink bin/jupyter 
Target /usr/local/bin/jupyter already exists.

You can try brew link --overwrite jupyter as suggested.

Answer 2

I reinstalled jupyter notebook with pip3 and everything worked fine when I treid to lauch the notebook again.

pip3 install jupyter
jupyter notebook

Answer 3

I faced the same error when I was using jupyter in a virtual environment. This was when I switched from homebrew 's python to the OS's python3.

All I had to do was rm /usr/local/bin/jupyter-lab and then run jupyter-lab

Answer 4

This problem usually occurs when the kernel for jupyter notebooks is being loaded from a previous python version that might not exist anymore.

• Run jupyter kernelspec list . kernel.json contains the path to the python version in use. You can either change this path directly, or nuke the Jupyter install (as follows) and reinstall it.
• Remove the Jupyter folder location (on mac: rm -rf /Users/<username>/Library/Jupyter/ )
• brew uninstall jupyter; brew cleanup
• If using pip and pyenv: pip install jupyterlab otherwise brew install jupyter

Answer 5

I faced the same and I tried $brew install jupyter as suggested here. But it gave me this error -

Error: Cannot install under Rosetta 2 in ARM default prefix (/opt/homebrew)!
To rerun under ARM use:
arch -arm64 brew install ...
To install under x86_64, install Homebrew into /usr/local.

As M1 Mac user this solved the issue finally -

arch -arm64 brew install jupyter

Answer 6

As of October 2020, @teresa 's solution worked for me.

I have to run pip3 to install devices, you can check which command for pip you need to use by running

pip -v 

and if you get nothing, try pip3 -v

Depending one which one worked, enter:

pip3 install jupyter
jupyter notebook

Answer 7

It looks like "pip3" installs jupyter with the same Python version in the kernel and the one being used in the notebook.

pip3 install jupyter
jupyter notebook