You'll want to isolate the Python environment that your script is in by creating a virtual environment. This will allow you to install Python packages with the versions that the script expects.
Instructions
Create a Python 3 virtualenv called script.
Activate the script virtualenv.
/home/dq$ virtualenv -p /usr/bin/python3 script
Running virtualenv with interpreter /usr/bin/python3
Using base prefix '/usr'
New python executable in /home/dq/script/bin/python3
Also creating executable in /home/dq/script/bin/python
Installing setuptools, pip, wheel...
/home/dq$ source script/bin/activate
(script) /home/dq$ source script/bin/activate
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