python datetime,字符串,時間戳相互轉換

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

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

#字符串轉時間戳 ex: 
　　time_string = '2020-05-26 11:42:54'
　　time.mktime(time.strptime(time_string, "%Y-%m-%d %H:%M:%S"))
 #時間戳轉字符串 ex:
　　stamp = 1590464574.0
　　time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(stamp))
 #datetime轉時間戳 ex:
　　now = datetime.datetime.now()
　　time.mktime(now.timetuple())