Potential for confusion on Pipenv & Virtual Environments

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.

首先比較 Installing Python 3 on Mac OS X 和 Pipenv & Virtual Environments 頁面，尤其是其中檢查 Python 版本的說明。明確 Python 3 應使用哪個命令，並解釋 python、python2 和 python3 命令之間的差異；當針對所述 macOS 環境的設定指南足夠明確時，文件工作就完成了。