uninstall python 2.7 and install 3
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Ubuntu depends greatly on Python 2.7 and Python 3, so there is no good method to remove it.
Warning: Do not even try to remove it else you will have your OS broken.
Here is my advice....
create a virtual environment for your workspaces,
and if you want something better,
Download Anaconda or Miniconda for a better solution (It depends on what you develop though).
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check this threads for more.
1. https://askubuntu.com/questions/1321421/how-to-remove-all-traces-of-python-from-ubuntu
2. https://askubuntu.com/questions/315015/how-can-i-remove-python-2-7-after-installing-python-3-3
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