[Python] Continuously read the last line of log file in python

I have a file in which new lines are continuously written.

In python, I would like to continuously read the last line of this file, so that I can process the line.

I know there is the readlines() function but this is "static". If new lines are added after I called readlines() these new lines will not be read.

How can I do this in python ? Thanks

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