str转时间格式:
dd = '2019-03-17 11:00:00'
In [21]: dd = datetime.strptime(dd, "%Y-%m-%d %H:%M:%S")
In [22]: dd
Out[22]: datetime.datetime(2019, 3, 17, 11, 0)
时间格式转str:
In [28]: dc = dd.strftime("%Y-%m-%d %H:%M:%S")
In [29]: dc
Out[29]: '2019-03-17 11:00:00'
In [30]: type(dc)
Out[30]: str
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