The following steps can be used:
sudo apt-get -y update
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sudo apt-get install python3.7
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python3.7
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curl -O https://bootstrap.pypa.io/get-pip.py
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sudo apt install python3-pip
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sudo apt install python3.7-venv
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python3.7 -m venv /home/ubuntu/app
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cd app
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source bin/activate