python计算时间

import time
import datetime

def compare_time(startTime,endTime):
    #now = datetime.datetime.now ()
    d_start = datetime.datetime.strptime (startTime, '%Y-%m-%d %H:%M:%S')
    d_end = datetime.datetime.strptime (endTime, '%Y-%m-%d %H:%M:%S')
    diff = d_end - d_start
    #diff_days = -diff.days
    
    total_seconds = diff.total_seconds()
    
    
    #result = (d_start<=now) and (d_end>=now)
    #result = (d_start==d_end)
    #print(diff_days)
    return total_seconds

'''
t1=datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
time.sleep(3)
t2=datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
total_seconds=compare_time(t1,t2)
print(total_seconds)
'''