Upgrade python from 2.7 to 3.5 in Ubuntu, and upgrade tupython

Upgrade python from 2.7 to 3.5 in Ubuntu, and upgrade tupython

Download the latest Python code from the ubuntu Terminal

Sudo apt-get install python3

The system will prompt you to enter the Linux Password, enter the password, and then download
The Python program just downloaded is installed in usr/local/lib/python3.5.

Use the command to delete the default python link file in the usr/bin/directory.

Creates a new connection for the default python compiler.

Sudo ln-s/usr/bin/python3.5/usr/bin/python

Verify that Python is installed by default.

Enter python in the Command window.