I am following the AWS CLI Setup guide. I have managed to successfully install the tool on my Mac OS X terminal with the following output:
Running cmd: /usr/bin/
This appears to be the Virtual Environment method at: https://docs.aws.amazon.com/cli/latest/userguide/awscli-install-virtualenv.html
without activating the virtualenv: source ~/cli-ve/bin/activate in the documented example.
source ~/cli-ve/bin/activate