import time
from datetime import datetime 

st = datetime.now()
time.sleep(5)
ft = datetime.now()
diff = str ((ft - st).total_seconds())#精确到微秒的时间差
print("diff : " + diff)

diff1 = str ((ft - st).days)#天数差值
print("diff1 : " + diff1)

diff2 = str ((ft - st).seconds)#精确到秒数的时间差
print("diff2 : " + diff2)

diff3 = str ((ft - st).microseconds)#只保留小数点后的时间差（也就是只有微秒的时间差）
print("diff3 : " + diff3)