Homebrew: "Python location" not pointing to a virtual environment

Description

“Python location” was added to the output of --version for the VSCode extension to pick up and use as the entry point for loading the command tree, documentation and completion proposals (#2986). That depends on “Python location” pointing to a virtual environment with all the CLI’s modules in it. When installing on Mac through Homebrew that is not the case and the VSCode extension does not work.

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Environment summary

Install Method: How did you install the CLI? (e.g. pip, interactive script, apt-get, Docker, MSI, nightly)
Answer here: Homebrew on Mac

CLI Version: What version of the CLI and modules are installed? (Use az --version)
Answer here: 2.0.18

OS Version: What OS and version are you using?
Answer here: Mac OS Sierra

Shell Type: What shell are you using? (e.g. bash, cmd.exe, Bash on Windows)
Answer here: zsh

/cc @derekbekoe @chrisdias

[JetPac33]

Had a similar problem with homebrew installed az. Python 3.6 was installed but not linked correctly by homebrew. The problem was fixed by doing brew link --overwrite python3

[derekbekoe]

I will submit a PR to https://github.com/Microsoft/vscode-azurecli with a fix shortly.