I just installed QGIS 3.4 on my computer (macOS Sierra 10.12.6) and I'm trying to install QuickMapServices, but I'm unable to. My plugins window looks like this:
and the settings tab says "The settings on this tab are only applicable for Python Plugins. No Python support detected, thus no settings available":
I downloaded QuickMapServices from the QGIS Python Plugin Repository, but I can't access it. I have Python 3.6.0 on my computer.