Set Python3 as default in CentOS or Amazon Linux2 


# Install Python3
sudo yum install -y python3
# Start by registering python2 as an alternative
sudo alternatives --install /usr/bin/python python /usr/bin/python2 50

# Register python3.5 as an alternative
sudo alternatives --install /usr/bin/python python /usr/bin/python3.5 60

# Select which Python version to use
sudo alternatives --config python
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