[Python] How to iterate cells from A1 to max_row (with data)?

How can I set the for iteration so that the variable goes from cell A1 to the last cell A in which there is data?

I need something like this

for x in ['A1' : 'An']


(where 'An' i mean last 'A' cell with data, it can be A10 or A22, its variable cell)

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