title: How to change the python environment in jupyter notebook?
body: <p>I already have a python3.7 environment on my mac(/Library/Frameworks/Python.framework/Versions/3.7),  I used that version for a long time until yesterday I installed anaconda3 accidentally, now the python kernel in my Jupiter notebook switched to python3.69 under anaconda, how can I change the default kernel of Jupiter notebook? I wanna use the python3.7 installed before. thx :)</p>