python datetime,字符串,时间戳相互转换

#datetime转字符串
ex: 
　　now = datetime.datetime.now()
　　time_string = now.strftime(\'%Y-%m-%d %H:%M:%S\')

#字符串转datetime
ex:
　　time_string = \'2020-05-26 11:42:54\'
　　datetime.datetime.strptime(time_string, "%Y-%m-%d %H:%M:%S")

#字符串转时间戳
ex: 
　　time_string = \'2020-05-26 11:42:54\'
　　time.mktime(time.strptime(time_string, "%Y-%m-%d %H:%M:%S"))
#时间戳转字符串
ex:
　　stamp = 1590464574.0
　　time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(stamp))
#datetime转时间戳
ex:
　　now = datetime.datetime.now()
　　time.mktime(now.timetuple())