Spyder: Unable to brew Spyder, Python 2.7, PyQt5 on macOS Sierra

[jpaasen]

Description of your problem

I'm trying to install Spyder using pip install spyder on macOs Sierra with brewed python 2.7.

When launching spyder I get the following error:

File "/usr/local/bin/spyder", line 11, in
sys.exit(main())
File "/usr/local/lib/python2.7/site-packages/spyder/app/start.py", line 103, in main
from spyder.app import mainwindow
File "/usr/local/lib/python2.7/site-packages/spyder/app/mainwindow.py", line 49, in
requirements.check_qt()
File "/usr/local/lib/python2.7/site-packages/spyder/requirements.py", line 39, in check_qt
import qtpy
File "/usr/local/lib/python2.7/site-packages/qtpy/__init__.py", line 125, in
raise PythonQtError('No Qt bindings could be found')
qtpy.PythonQtError: No Qt bindings could be found

I tried the following:
brew update
brew install pyqt

Which fails with:

qt:
This formula either does not compile or function as expected on macOS
versions newer than El Capitan due to an upstream incompatibility.
Error: An unsatisfied requirement failed this build.`

I'm able to do: brew install pyqt5, but Spyder is still failing with the same error.

pip install pyqt5 fails with

Collecting pyqt5
Could not find a version that satisfies the requirement pyqt5 (from versions: )
No matching distribution found for pyqt5

The same goes for pip install pyqt.

From your release site I see that you have only compiled a dmg file for Python 3.5. I'm I correct when assuming that brewed Spyder does no longer work on Sierra with Python 2.7 (since qt4 support has been removed by brew), or is there something I can do to make it work?

Versions and main components

• Spyder Version: 3.0.1
• Python Version: 2.7.12 (brew)
• Operating system: macOS Sierra (10.12.1)

[jpaasen]

Ok. This seems to fix this issue:
brew install pyqt5 --with-python --without-python3