要么seek到文件开头
with open(...) as fin:
fin.read() # read first time
fin.seek(0) # offset of 0
fin.read() # read again
或再次打开文件（我更喜欢这种方式，因为否则您将使文件保持打开状态一个小时，而在两次通过之间不执行任何操作）
with open(...) as fin:
fin.read() # read first time
with open(...) as fin:
fin.read() # read again
放在一起
while True:
with open(...) as fin:
for line in fin:
# do something
time.sleep(3600)
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