Array? Please help.

[Dr. Pastor]

I need a row of 127 bytes that I will use as a
circular buffer. Into the bytes (at unspecified times)
a mark (0<mark<128) will be written, one after the other.
After some time the "buffer" will contain the last 127 marks.
(A pointer will point to the next byte to write to.)
What would be the Pythonic way to do the above?
Thanks for any guidance.
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