dyld: Library not loaded: /usr/local/opt/python/Frameworks/Python.framework/Versions/3.6/Python

I started getting this error after trying to install macvim as follows:

brew install macvim --override-system-vim

The error string is as following:

$ vi linkedlist.cc
dyld: Library not loaded: /usr/local/opt/python/Frameworks/Python.framework/Versions/3.6/Python
  Referenced from: /usr/local/bin/vim
  Reason: image not found
Abort trap: 6

I checked shared libs for vim using otool.

$ otool -L /usr/local/bin/vim
/usr/local/bin/vim:
 /usr/lib/libncurses.5.4.dylib (compatibility version 5.4.0, current version 5.4.0)
 /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0)
 /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
              (compatibility version 45.0.0, current version 1561.40.112)
 /usr/local/opt/lua/lib/liblua.5.3.dylib 
               (compatibility version 5.3.0, current version 5.3.4)
 /usr/local/opt/perl/lib/perl5/5.26.1/darwin-thread-multi-2level/CORE/libperl.dylib
               (compatibility version 5.26.0, current version 5.26.1)
 /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.50.4)
 /usr/lib/libutil.dylib (compatibility version 1.0.0, current version 1.0.0)
 /usr/local/opt/python/Frameworks/Python.framework/Versions/3.6/Python 
              (compatibility version 3.6.0, current version 3.6.0)
 /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
               (compatibility version 150.0.0, current version 1452.23.0)
 /usr/local/opt/ruby/lib/libruby.2.5.dylib (compatibility version 2.5.0, current version 2.5.1)
 /usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 228.0.0)
 /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices 
                (compatibility version 1.0.0, current version 822.31.0)
 /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation 
                         (compatibility version 300.0.0, current version 1452.23.0)

It appears that many shared libs versions are updated incorrectly.

To solve the problem, I tried to upgrade packages.

$ brew update
Already up-to-date.

$ brew upgrade

It started working after doing upgrades.

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