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Using OpenAI to summarise PDF

To use OpenAI to summarise text from a PDF using Python 3.11.6, you'll first need to extract the text from the PDF and then send it to the OpenAI API for summarisation.





pip install python-dotenv langchain openai tiktoken pypdf pymupdf



The current code is on my Summaries GitHub page.


How to add an environment variable in Ubuntu

To set an environment variable on Ubuntu, can be achieved via a few options.  This depends on whether you want the variable to be system-wide or specific to a user's session.  Here are a couple of more common methods for setting environment variables:

Adding SSL wildcard certificate to Ubuntu running Nginx

Adding an SSL wildcard certificate to an Ubuntu server involves several steps.  A wildcard certificate can secure subdomains of a domain with a single certificate. Here's a general outline of the process:

I'll be using an existing wildcard certificate.

sudo apt update && sudo apt upgrade -y


Solving the errors in running Open AI on Ubuntu

While the default version on Ubuntu 20.04 for Python is 3.8, I've added Python 3.11.5 (latest version).


GPTSimpleVectorIndex is deprecated

Attempting to run python3.11 and I'm seeing the following response

Update Python on Ubuntu

Ubuntu 20.04 comes with Python 3.8 installed.  If you run the update script, you'll be informed that the latest version of Python is running.  But here is the kicker, the actual latest version is currently 3.11.6... see

Use the following commands to download the Python 3.11.6 source code

Could not get lock /var/lib/apt/lists/lock

Logging into the server, and there are packages to be updated.  You know the standard Ubuntu / Linux response

5 updates can be applied immediately.
To see these additional updates run: apt list --upgradable

3 additional security updates can be applied with ESM Apps.
Learn more about enabling ESM Apps service at

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