比較之前定義的時間

Question

我是Python新手。

我想用previously_defined_time變量，從被執行此功能的最後一次值來比較當前日期時間價值。如何做到這一點？

import datetime 

if foo(): 
    now = datetime.datetime.now() 
    if (now – priviously_defined_time) > 1000: 
     .. 
     some code 
     .. 
     priviously_defined_time = datetime.datetime.now() 

Answer 1

使用關鍵字global

import datetime 
#define somewhere your previously_defined_time 
previously_defined_time = 0 

if foo(): 
    # use the word global to indicate that previously_defined_time is a global variable 
    global previously_defined_time 
    now = datetime.datetime.now() 
    if (now – previously_defined_time) > 1000: 
     # .. 
     # some code 
     # .. 
     previously_defined_time = datetime.datetime.now()