time庫

時間獲取函式:

time() # 獲取從1970.7.1 0:0到目前的秒數
ctime() # 獲取一個時間的字串
gmtime() #獲取一個時間資料

例如

>>> time.time()
1523105888.8286796
>>> time.ctime()
'Sat Apr  7 20:58:12 2018'
>>> time.gmtime
<built-in function gmtime>
>>> time.gmtime()
time.struct_time(tm_year=2018
 
, tm_mon=4, tm_mday=7, tm_hour=12, tm_min=58, tm_sec=22, tm_wday=5, tm_yday=97, tm_isdst=0)

時間格式化

strftime(tpl, ts) # 第一個引數模板, 第二個引數gmtime()
strptime() # 作用和strftime()相反, 結果得到一個gmtime()型別的值

>>> time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime())
'2018-04-07 13:06:49'

引數:

%Y 4位數的年0001-9999
%y
 
 2位數的年
%m 月份00-12
%H 24制小時
%h 12制小時
%M 分鐘
%S 秒
%B 全拼的月份
%b 縮寫的月份
%A 星期
%a 縮寫的星期
%p 上午/下午

例項

>>> strftime('%Y-%m-%d %H:%M:%S', t)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'strftime' is not defined
>>> time.strftime('%Y-%m-%d %H:%M:%S'
 
, t)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 't' is not defined
>>> time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime())
'2018-04-07 13:06:49'
>>> time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime())
'2018-04-07 13:07:09'
>>> strtime = '2018-04-07 13:07:09'
>>> strptime(strtime, ''%Y-%m-%d %H:%M:%S')
  File "<stdin>", line 1
    strptime(strtime, ''%Y-%m-%d %H:%M:%S')
                           ^
SyntaxError: invalid syntax
>>> time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime())
'2018-04-07 13:08:42'
>>> time.strftime('%y-%m-%d %H:%M:%S', time.gmtime())
'18-04-07 13:08:47'
>>> time.strftime('%y-%M-%d %H:%M:%S', time.gmtime())
'18-08-07 13:08:55'
>>> time.strftime('%y-%M-%D %H:%M:%S', time.gmtime())
'18-09-04/07/18 13:09:06'
>>> time.strftime('%y-%m-%d %H:%M:%S', time.gmtime())
'18-04-07 13:09:16'
>>> time.strftime('%d', time.gmtime())
'07'
>>> time.strftime('%D', time.gmtime())
'04/07/18'
>>> time.strftime('%m', time.gmtime())
'04'
>>> time.strftime('%M', time.gmtime())
'10'
>>> time.strftime('%M', time.gmtime())
'10'
>>> time.strftime('%B', time.gmtime())
'April'
>>> time.strftime('%h, time.gmtime())
  File "<stdin>", line 1
    time.strftime('%h, time.gmtime())
                                    ^
SyntaxError: EOL while scanning string literal
>>> time.strftime('%m, time.gmtime())
  File "<stdin>", line 1
    time.strftime('%m, time.gmtime())
                                    ^
SyntaxError: EOL while scanning string literal
>>> time.strftime('%p %h:%M:%S', time.gmtime())
'PM Apr:13:15'
>>> time.strftime('%p %H:%M:%S', time.gmtime())
'PM 13:13:49'
>>> time.strftime('%p %h:%M:%S', time.gmtime())
'PM Apr:13:57'
>>>

程式計時

sleep() # 休眠, 以s為單位
perf_counter() # 當前時間, 以秒為單位, 獲取差值

製作一個簡單的文字進度條

#-*- coding:-utf -*-
import time
scale = 50
print('執行開始'.center(scale, '-'))
start = time.perf_counter();
for i in range(101):
    a = '*'*(i//2)
    b = '.'*(50-i//2)
    cur = time.perf_counter() - start
    print('\r{:>3.0f}%[{}->{}]{:.2f}'.format(i, a, b, cur), end = '')
    time.sleep(0.05)
print()
print('執行結束'.center(scale, '-'))

使用\r重新整理當前行

製作簡易時鐘

import time
while 1:
    print(time.strftime('\r%Y-%m-%d  %H:%M:%S', time.gmtime()), end = '')
    time.sleep(1)