What is the procedure for using Python to substitute text in a PDF document?

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There are several packages available to manipulate PDFs using Python, but the most commonly used is PyPDF2. Here is an example procedure for using PyPDF2 to substitute text in a PDF document:

1. Install PyPDF2 using pip or your preferred package manager.
2. Import PyPDF2 into your Python script.
3. Open the PDF file using PyPDF2 and create a PDF reader object.
4. Create a PDF writer object and loop through each page in the PDF reader object.
5. Use the PyPDF2 page object methods (e.g. extractText, addText) to search for and replace text on each page.
6. Write the modified pages to the PDF writer object.
7. Save the new PDF file with the modified text.

Keep in mind that not all PDFs are easily editable, and replacing text can be a delicate process. Additionally, PyPDF2 may not be able to handle certain types of PDF files, such as those with embedded fonts or special formatting.