python日期格式与str互相转换与自定义格式

import datetime

now=datetime.datetime.now()
#自定义日期格式转str
times=now.strftime("%Y-%m-%d %H:%M:%S")
print(type(times))

#自定义指定日期
now=datetime.datetime(2019,10,1,12,32,40)
#字符串转日期
s="2020-8-15 2:30:20"
print(type(s))
a=datetime.datetime.strptime(s,"%Y-%m-%d %H:%M:%S")
print(a)
print(type(a))