SageMath and Spyder on macOS
Via Conda
One way to go is to install both Sage and Spyder via Conda.
Start from scratch
The "Conda" section of the installation guide
explains how to start from scratch by installing Miniconda.
Follow the instructions there, but when creating the environment,
make sure to add Spyder (and any extra things if needed):
$ conda config --add channels conda-forge
$ conda create -n sage sage python=3.7 spyder=4
Already have Anaconda
In case Anaconda is already there, all that is left to do is to
- either create a "sage" Conda environment with the "sage" Conda package
from the conda-forge channel
- or install the "sage" Conda package (from the conda-forge channel)
into an existing Conda environment
In either case, use the Anaconda prompt and type in appropriate
commands.
Then in Anaconda navigator, select the "sage" Conda environment
(or the environment in which the "sage" Conda package was installed)
and launch Spyder.
Related: Stack Overflow question 43592879: How to change Python version in Anaconda Spyder.
Via a downloaded dmg
Instead of using Conda, one might want to use a Sage version
downloaded from the SageMath download page.
I don't know how that would work. One would need to either
let an existing Spyder know to use Sage's Python, or to install
Spyder for Sage's Python.
Hopefully someone can expand on that approach if there is
an interest (please leave a comment to indicate interest in this).
Further reading
Can you import sage ? If yes, try
from sage.all import *
. Else you may need to tell your IDE to use sage own python.