用python的时间转换函数，结果报错。想着这么基础的怎么会报错呢。
from datetime import datetime
# timestamp is number of seconds since 1970-01-01
timestamp = 1545730073
# convert the timestamp to a datetime object in the local timezone
dt_object = datetime.fromtimestamp(timestamp)
# print the datetime object and its type
print("dt_object =", dt_object)
执行到第九行爆OSError [Errno22] Invalid Argument
原因是Windows下是毫秒级的时间戳，需要除以1000才可以转成秒级。
所以上面只要改一下即可
dt_object = datetime.fromtimestamp(timestamp / 1000)
初学python，慢慢积累。