[Python] How do I convert a byte to an integer in python when it has the byte markers...

I have a function in python which reads the first 3 bytes in a serial port buffer. I then want to convert the third byte to an integer which will allow me to determine the length of the total byte array. However, when I use int() I get the following error:

ValueError: invalid literal for int() with base 16: b'\x16'

I've tried slicing the string further along, but that just returns b''. How can I convert the byte to an integer?

Thank you!

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