QGIS3 won't install on mac with python3.6 already installed through Ananconda

Question

QGIS installer keeps telling "QGIS requires Python 3.6." after which it quits installing on Mac. However I have python 3.6.4 at least on 4 locations

1) ~/anaconda/bin/python

2) /usr/bin/python3

3) /usr/local/bin/python

4) /usr/local/bin/python3.6 (through a symbolic link).

All these files refer to the same file, when invoking them they all yield:

Python 3.6.4 |Anaconda custom (64-bit)| (default, Jan 16 2018, 12:04:33) [GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin Type "help", "copyright", "credits" or "license" for more information.

Does anyone know where QGIS3 installer looks for python 3.6, so I could set a symbolic link to the python 3.6 version that is already installed through Anaconda?

Thanks, Theo

Answer 1

Ran into this problem myself. Creating a symbolic link to where the installer expects to find python works. I had to find where Homebrew installed Python... (note the version in the path)

sudo ln -s /usr/local/Cellar/python/3.6.5/Frameworks/Python.framework /Library/Frameworks/Python.framework

Answer 2

I had python 3.7 and QGIS 3.X was looking for python 3.6.

error: "qgis requires python 3.6"

to downgrade I tried many things but finally "brew prune" and installing 3.6 directly from python.org worked for me.

https://www.python.org/downloads/release/python-366/

Answer 3

I had to install python 3.6 directly downloaded from www.python.org (ignoring the already installed version by Anaconda). This worked. See remark on http://www.kyngchaos.com/blog/2018/20180315_qgis_3_must_use_python.org_python_3

Answer 4

Install via the terminal with

conda install -c conda-forge qgis 

I had the same issue and could only install QGIS with this solution. https://anaconda.org/conda-forge/qgis

Answer 5

According to this answer, the path is in:

/usr/local/Cellar/python3/3.x.y_z/Frameworks/Python.framework

Answer 6

I installed Python 3.6.5 from the main Python webpage ignoring the existing Anaconda version that I use regularly. Then once it is completed I checked my PATH and I had both directory

echo $PATH
/Library/Frameworks/Python.framework/Versions/3.6/bin:/anaconda3/bin:

You can check the folder of python using which python3 and it should give you the Frameworks.

I installed the GDAL and then QGIS without any problems. I run QGIS and it is working, until now :)

Remember: you will need to use pip3 to install any missing modules other wise it you will be calling the pip under anaconda.

owslib, PyYaml, psycopg2, jinja2, pygments, numpy, plotly.

pip3 install modulename