easy_install -U pyobjc-core worked just fine, however I have tried easy_install -U pyobjc and pip -U install pyobjc and every other way you can think of (except probably the correct one) and they all return:
error: Setup script exited with error: This distribution is only supported on MacOSX versions 10.6 upto and including 10.8
Which doesn't make any sense, because wasn't pyobjc 3.0 created long after OS X 10.8 became outdated?
On
Here is the issue:
https://bitbucket.org/ronaldoussoren/pyobjc/issue/103/pip-wheel-pyobjc-and-pip-install-pyobjc
If it has been fixed but not released, your only option is to install from source.
Version 3.1.1 of PyObjC was recently released and fixes this issue.