at first, I downloaded the python3.7.0 from the official website. at this time, when I enter python in cmd, it pops up and shows the 3.7.0. And I need the conda, I try pip3 install conda (pip does not work because it may be the python3.7.0), somehow, when I enter python in cmd, it turns out to be python 2.7?? and I went to the anaconda website, I install the anaconda package, at this time when I enter python in cmd, it turns out to be python 3.6.5. by this time, I have 3 python, I want to remove all other python except the 3.7.0. I tried to use anaconda to remove the python3.6.5, it failed. what to do?
My computer is MAC

[![Error of anaconda](https://i.stack.imgur.com/q5atN.png)](https://i.stack.imgur.com/q5atN.png)