This question is closely related to this question where I got a very similar error message when launching vim after doing a brew upgrade:
dyld: Library not loaded: /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/Python
Referenced from: /usr/local/bin/vim
Reason: image not found
Abort trap: 6
The solution was to reinstall ruby and vim, however in my case it was probably caused by downgrading Python 3.7 back to 3.6 (3.7 ended up breaking a lot of libraries that I am using due to incompatibility,) and reinstalling Python3.6 and Vim didn't help.
I am not sure why Vim is looking for Python 3.7, which I don't even have on my machine. The only versions I have are 3.6.5, 2.7, and system Python.
Both vim and python were installed from brew.
