Re-read an open file Python

Either seek to the beginning of the file

with open(...) as fin:
    fin.read()   # read first time
    fin.seek(0)  # offset of 0
    fin.read()   # read again

or open the file again (I’d prefer this way since you are otherwise keeping the file open for an hour doing nothing between passes)

with open(...) as fin:
    fin.read()   # read first time

with open(...) as fin:
    fin.read()   # read again

Putting this together

while True:
    with open(...) as fin:
        for line in fin:
            # do something 
    time.sleep(3600)