How to get rid of Python2.7 pre-installed by Apple

Mac comes with Python2.7 installed by Apple.

I needed to use a more recent version so I installed Python3.8.

I followed an article, I found online on  www.macupdate.com/app/mac/5880/python/uninstall  

to get rid of Python2.7 before installing Python3.8.

I think I botch something in trying to eliminate Python2.7 from my Mac.

I opened a terminal and launched python. Unluckily The old pre-installed version is still there.

mauramonville@Mauras-MacBook-Pro ~ % python --version

Python 2.7.16

mauramonville@Mauras-MacBook-Pro /usr % ls

X11      bin      libexec      sbin     standalone

X11R6        lib      local        share

I looked for files whose name contains the string "python" and found traces of both Python versions.

mauramonville@Mauras-MacBook-Pro /usr % pwd

/usr

mauramonville@Mauras-MacBook-Pro /usr % find . -name "python*" -print

./bin/python3

./bin/python

./bin/python2

./bin/pythonw

./bin/python2.7-config

./bin/pythonw2.7

./bin/python-config

./bin/python2.7

find: ./sbin/authserver: Permission denied

./local/bin/python3

./local/bin/python

./local/bin/python3.8

./local/bin/python3-config

./local/bin/python3.8-config

./lib/python2.7

./share/man/man1/python2.7.1

./share/man/man1/pythonw2.7.1

./share/man/man1/python.1

./share/man/man1/pythonw.1

./share/vim/vim82/indent/python.vim

./share/vim/vim82/ftplugin/python.vim

./share/vim/vim82/autoload/python3complete.vim

./share/vim/vim82/autoload/pythoncomplete.vim

./share/vim/vim82/syntax/python.vim

./share/file/magic/python

I notice a mixture of python2.7 (pre-installed by Apple) and python3.8 (installed by myself).

mauramonville@Mauras-MacBook-Pro local % pwd

/usr/local

mauramonville@Mauras-MacBook-Pro local % find . -name "python*" -print

./bin/python3

./bin/python

./bin/python3.8

./bin/python3-config

./bin/python3.8-config

How can I get rid of python2.7 and use python3.8 instead?

Thank you so much in advance.

   Best regards,

     mauede33