Potential for confusion on Pipenv & Virtual Environments

Comece comparando as páginas Installing Python 3 on Mac OS X e Pipenv & Virtual Environments, especialmente as instruções para verificar a versão do Python. Esclareça qual comando deve ser usado para Python 3 e explique as diferenças entre os comandos python, python2 e python3; a documentação estará concluída quando as instruções de configuração forem inequívocas para o ambiente macOS descrito.

I arrived on the Pipenv & Virtual Environments page from Installing Python 3 on Mac OS X. At that point, I've have installed python2 and python3 via homebrew and there is also the system python. Installing Python 3 on Mac OS X clearly states that

Working with Python 3
At this point, you have the system Python 2.7 available, potentially the Homebrew version of Python 2 installed, and the Homebrew version of Python 3 as well.

$ python
will launch the system Python interpreter.

$ python2
will launch the homebrew-installed Python 2 interpreter (if any).

$ python3
will launch the homebrew-installed Python 3 interpreter.

And yet on Pipenv & Virtual Environments the first thing I'm encouraged to do is make sure python3 is installed by typing $python --version which will display the system Python interpreter version.

This could potentially confuse a new developer who may be wondering why they are seeing version say 2.7.x instead of 3.6.x as the writeup suggest. Besides as at the time of writting there are not many OS's that have $python defaulting to version 3.6.x.

If the writeup in insisting of starting Python 3 with the command $python then it needs to be explained how this can be done safely.

Thanks.