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.

首先比较 Installing Python 3 on Mac OS X 和 Pipenv & Virtual Environments 页面，尤其是其中检查 Python 版本的说明。明确 Python 3 应使用哪个命令，并解释 python、python2 和 python3 命令之间的差异；当针对所述 macOS 环境的设置指南足够明确时，文档工作就完成了。