pkg_resources.VersionConflict pyobjc-core

When I run the command "sudo pip install -U pyobjc", as per the documentation, on OS X El Captain 10.11.5 I get the error message:

raise VersionConflict(dist,req) # XXX put more info here

pkg_resources.VersionConflict: (pyobjc-core 2.5.1 (/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC), Requirement.parse('pyobjc-core>=3.1.1')) 

Could you help?

Are you using /usr/bin/python for this? If so: don't upgrade PyObjC in the system install of Python, that might break functionality of the OS. It is better to either use the Python.org installer or virtualenv (or both).

Thank you. Yes I was using the system install of Python. When I use virtualenv it works fine. However, at the time I was using a third party library that couldn't run inside virtualenv.

Closing as 'wontfix' because this is about interaction with a system install of Python.

Removing version: 3.0 (automated comment)