so i was trying to use matplotlib for fast image ploting and updating, and I found a post here.
the matplotlib uses different backend to render the images, and due to the differences between different backend, some functions are only available for specific backend, for instance, the fig.canvas.update() is a fast way to render new images to the axes, but is only availabe to PyQt4.
so i was trying to install pyqt4 using homebrew, it failed by saying the osx version is pre-released version and is not supported, and arises 2 errors during make process.
this is due to the cached info for homebrew is not up-to-date, so you need to run brew update.
however, this also arises an error of “not writable directory: /usr/local, so you need to sudo chown - $user:admin /usr/local, then update shall work, then run brew install pyqt (add --with-python3 if need to support python3.x).
now the remaining problem is the pyqt package cannot be imported in python shell because homebrew gives the below message:
Python modules have been installed and Homebrew’s site-packages is not in your Python sys.path, so you will not be able to import the modules this formula installed. If you plan to develop with these modules, please run: echo ‘import site; site.addsitedir("/usr/local/lib/python2.7/site-packages”)’ » /path/to/your/python/folder/site-packages/homebrew.pth
you may run import site; site.getsitepackages() to find out the path to your python site-packages folder,
of course, you need to change python2.7 to python3.x for python3 support.
Another thing is use python3 -m pip instead of pip so to ensure the package will be installed in the default site-packages folder, actually python3 -m pip install pyside successfully installed pyside for python3
however, i found pyside 1.2.4 does not work due to the @rpath issue, cannot find a solution for it. so i installed pyside 1.2.2 and downloaded [https://raw.githubusercontent.com/PySide/pyside-setup/1.2.2/pyside_postinstall.py], after running this script, the pyside is succesfully installed and can be imported