How to rotate PDF files with Python

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Rotating PDF files (or only one PDF page) can be done using Python and the PyPDF2 library in only 10 lines of code!

[leninchavezguamialama]

What happens if you run the same code with the file rotated? rotate again or keep the 90 degree rotation

[guiguspi]

Doesn't the target_file got opened? Should it not be closed aswell?

Or is the PdfFileReader() different from the Open() as in to not be problematic?

[sidmahajan]

I have many pdf files that I want to rotate with one script how to write code for that? can you help?