iPython 3 uses Python 2 instead of Python 3

Question

iPython 3 — installed with pip3 and located at /usr/local/bin/ipython3 — runs with Python 2.7.6 in both the console and notebook whereas I want it to run with Python 3 as it should.

This used to work fine before, but I may have reinstalled stuff using MacPorts or HomeBrew that triggered the change.

$ which -a python
/opt/local/bin/python  # 2.7.9
/usr/local/bin/python  # 2.7.8
/usr/local/bin/python

$ which -a python2
/usr/local/bin/python2 # 2.7.8
/usr/local/bin/python2

$ which -a python3
/usr/local/bin/python3 # 3.2.4
/usr/local/bin/python3

$ pip3 -V
pip 1.5.6 from /usr/local/lib/python3.4/site-packages (python 3.4)

$ ipython3 -V
2.3.1

did you specify ipython3 to start a shell/notebook? In relation to the second part that is what happens when you install multiple interpreters. — Padraic Cunningham
– Padraic Cunningham, Commented Jan 17, 2015 at 16:15
The problem is probably because pip3 actually points to python2, remove it and reinstall using get-pip.py and the python3 interpreter — Padraic Cunningham
– Padraic Cunningham, Commented Jan 17, 2015 at 16:29
when you started an ipython3 shell previously what did you see listed as the interpreter? Also add output for which -a python and which -a python3 — Padraic Cunningham
– Padraic Cunningham, Commented Jan 17, 2015 at 17:40

Yatharth Agarwal · Accepted Answer · 2015-01-17 15:57:52Z

3

I edited the shebang on the iPython executable from #!/usr/bin/python to #/usr/local/bin/python3, but I am not sure if this is a hacky or bad solution.

answered Jan 17, 2015 at 15:57

Yatharth Agarwal

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3 Comments

Thomas K Over a year ago

That's a fine solution, though it's unfortunate that it was necessary in the first place.

dsaxton Over a year ago

@YatharthROCK Can you explain how you did this in more detail?

Yatharth Agarwal Over a year ago

@dsaxton Type nano `which ipython3` and change the first line to what is described in the answer above.

raj bhatt · Accepted Answer · 2016-07-22 01:54:27Z

0

what work for me is changing #!/usr/bin/python to #! /usr/bin/python3 in file /usr/local/bin/ipython3

Just make sure that above address in all files coming out from 'whereis ipython3' should be same.

edited Jul 22, 2016 at 1:54

answered Jul 21, 2016 at 23:25

raj bhatt

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