根據(jù)網(wǎng)上的一些說法，

在python里獲取ms級(jí)系統(tǒng)時(shí)間可以通過以下方式獲取：

import datetimeprint(datetime.datetime.now().microsecond)

但通過以下代碼測試，發(fā)現(xiàn)返回的并不是ms的值，而是us的值：

import datetime def getTime_ms(): return (datetime.datetime.now().hour*3600 + datetime.datetime.now().minute*60+ datetime.datetime.now().second )*1000+ datetime.datetime.now().microsecond/1000 def timetime(): t = getTime_ms() while getTime_ms() - t < 500:pass a = getTime_ms() print(t, a, a- t) if __name__ == ’__main__’: from timeit import timeit t = timeit(’timetime()’, ’from __main__ import timetime’, number=1) print(t)

打印結(jié)果

(35460614, 35461114, 500) 0.499531984329

上面實(shí)驗(yàn)不太直觀，換一個(gè)直觀點(diǎn)的：

def timetime(): t1 = datetime.datetime.now() while 1:t2 = datetime.datetime.now()if (t2 - t1).microseconds >= 1: print(t2,t2.microsecond,t1,t1.microsecond,(t2-t1).seconds) break if __name__ == ’__main__’: from timeit import timeit t = timeit(’timetime()’, ’from __main__ import timetime’, number=1) print(t) #print (datetime.datetime.now())

輸出

(datetime.datetime(2019, 4, 3, 10, 6, 20, 461882), 461882, datetime.datetime(2019, 4, 3, 10, 6, 20, 461863), 461863, 0) 7.10487365723e-05

def timetime(): t1 = datetime.datetime.now() while 1:t2 = datetime.datetime.now()if (t2 - t1).microseconds >= 1000: print(t2,t2.microsecond,t1,t1.microsecond,(t2-t1).seconds) break if __name__ == ’__main__’: from timeit import timeit t = timeit(’timetime()’, ’from __main__ import timetime’, number=1) print(t) #print (datetime.datetime.now())

輸出

(datetime.datetime(2019, 4, 3, 10, 13, 52, 76548), 76548, datetime.datetime(2019, 4, 3, 10, 13, 52, 75547), 75547, 0) 0.00104904174805

補(bǔ)充：Python datetime去除毫秒 返回當(dāng)前時(shí)間

datetime模塊返回當(dāng)前時(shí)間

import datetimeif __name__ == ’__main__’: a = datetime.datetime.now().replace(microsecond=0) print(a, type(a))

運(yùn)算結(jié)果：

2020-05-22 12:13:42 <class ’datetime.datetime’> Process finished with exit code 0

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持好吧啦網(wǎng)。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教。