brew trying "migrating python3 to python" every time

Question

I believe the python environment is my Mac is a little bit mess up... Every time I use brew, it will first do this:

==> Migrating python3 to python
==> Unlinking python3
==> Unlinking python
Error: Error occurred while migrating.
Permission denied @ unlink_internal - /usr/local/share/python
Backing up...
Error: Permission denied @ unlink_internal - /usr/local/share/python

in my mac, I have:

python2, which is referred by 'python', and it's installed by anaconda bundle.
python3, which is referred by 'python3', and it's installed by brew.

Actually I create a symbolic link in /usr/local/bin for python3, which is the best way I can figure out to distinguish python/python3 in my machine......but recently it's just messed up...

I tried find / -name "python3", and here is the result:

/Users/liuziqi/anaconda/lib/python2.7/site-packages/astroid/tests/testdata/python3
/Users/liuziqi/google-cloud-sdk/.install/.backup/platform/gsutil/third_party/crcmod/python3
/Users/liuziqi/google-cloud-sdk/.install/.backup/platform/gsutil/third_party/httplib2/python3
/Users/liuziqi/google-cloud-sdk/platform/gsutil/third_party/crcmod/python3
/Users/liuziqi/google-cloud-sdk/platform/gsutil/third_party/httplib2/python3
/usr/local/Cellar/python3
/usr/local/Cellar/python3/3.6.1/bin/python3
/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/bin/python3
/usr/local/Cellar/python3/3.6.4_2/bin/python3
/usr/local/Cellar/python3/3.6.4_2/Frameworks/Python.framework/Versions/3.6/bin/python3
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Aliases/python3
/usr/local/lib/python3.6/site-packages/astroid/tests/testdata/python3
/usr/local/opt/python3

the python3 I previously used is /usr/local/Cellar/python3/3.6.1/bin/python3, and I created a link to /usr/local/bin

Firstly, do you need to have both Python 2 and 3 on your machine? secondly, when you run ls -la /usr/local/share/ | grep python, who owns this file? It seems like Brew don't have permission to remove the file. — Prav
– Prav, Commented Mar 3, 2018 at 22:58
To be fair I should've asked this before. What are you trying to do? Are you trying to upgrade Python? — Prav
– Prav, Commented Mar 3, 2018 at 23:03
I do need both python2 and python3. Actually I'm not doing anything with python, the problem is that when I use brew to install something else, it will first trying migrating python (maybe the that package have some dependency on python). — Ziqi Liu
– Ziqi Liu, Commented Mar 3, 2018 at 23:38
when i run ls -la /usr/local/share/ | grep python, the result is lrwxr-xr-x 1 liuziqi admin 38 1 11 03:45 python -> ../Cellar/python/2.7.14_2/share/python — Ziqi Liu
– Ziqi Liu, Commented Mar 3, 2018 at 23:38

Ortomala Lokni · Accepted Answer · 2018-03-04 04:06:50Z

1

You have to fix the permissions with:

sudo chown -R "$USER":admin /usr/local
sudo chown -R "$USER":admin /Library/Caches/Homebrew

It works well, if you are the only Homebrew user on the system. It could cause problems if third party tools are waiting other permissions on /usr/local. But, I use this settings for years without problems. See How to fix homebrew permissions? for details.

answered Mar 4, 2018 at 4:06

Ortomala Lokni

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