在python中比较微秒时间差（microsecond）

import time
from datetime import datetime

start = round(time.time() * 1000)
print(start)

start_ = datetime.utcnow()
print(start_)

time.sleep(1)

end = round(time.time() * 1000)
print(end)

end_ = datetime.utcnow()
print(end_)

c = (end_ - start_)
print(c.seconds)
print(c.microseconds)
print(c)
print(c/2)