[Python知识库]pandas时间函数的构造方法

时间模块：datetime
1.datetime.date：date对象 年月日

datetime.date.today()
该对象类型为datetime.date
可以通过str函数转化为str
In [1]: import datetime

In [2]: today = datetime.date.today()

In [3]: today
Out[3]: datetime.date(2020, 4, 28)

In [4]: print(today,type(today))
2020-04-28 <class ‘datetime.date’>

In [5]: print(str(today))
2020-04-28

2.datetime.datetime：datetime对象 年月日时分秒-

datetime.datetime.now() datetime.datetime.today()
对象类型为datetime.datetime
可以通过str函数转为str
In [6]: now = datetime.datetime.now()

In [7]: now
Out[7]: datetime.datetime(2020, 4, 28, 22, 48, 16, 780405)

In [8]: print(now,type(now))
2020-04-28 22:48:16.780405 <class ‘datetime.datetime’>

In [9]: print(str(now),type(str(now)))
2020-04-28 22:48:16.780405 <class ‘str’>
创建datetime对象：datetime.datetime(x,x,x,x,x)
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