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"2013/9/30"字符串怎么用python转换为统一的"2013-09-30"?

一堆老数据,格式是这样的"2013/9/30"
我想用python转换为统一的"2013-09-30",怎样做比较优雅?不用字符串解析的那种
谢谢
问题
1、第一个是对的,为什么一来一回就把月份变成09了
2、第二个为什么不对啊?
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m - month
M - Minute

https://docs.python.org/zh-cn...


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