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- sudo apt-get update
- sudo add-apt-repository ppa:deadsnakes/ppa
- sudo apt-get install python3.9
- sudo update-alternatives --install /usr/bin/python python /usr/lib/python2.7 0
- sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.8 1
- sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.9 2
- sudo update-alternatives --config python
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