Mac Toggle Default Python version

https://www.zhihu.com/question/30941329

First the terminal's "python" command executes the "Python" link under/usr/local/bin, which is equivalent to the shortcut under Win, and now links to python2.7.9 's interpreter. We would like to change this link, it is recommended to first back up this "Python" link, such as I:

mv /usr/local/bin/python /Users/python_backup

Then make a link to the original directory of the 3.4.3 interpreter, please modify the relevant path appropriately:

sudo ln -s /System/Library/Frameworks/Python.framework/Versions/3.4/bin/python3.4 /usr/local/bin/python

Mac Toggle Default Python version