Python中的时间函数 |设置 1 (time(), ctime(), sleep()…)

Python定义了一个模块，“时间”，它允许我们处理关于时间的各种操作、它的转换和表示，这些操作在生活中的各种应用程序中都有使用。时间的开始是从1970 年 1 月 1 日凌晨 12:00开始测量的，这个时间在Python中被称为“纪元”。

准时操作：

1. time() :- 此函数用于计算自 epoch 以来经过的秒数。 2. gmtime(sec) :- 该函数返回一个结构，其中包含 9 个值，每个值依次代表一个时间属性。它将秒转换为时间属性（天、年、月等） ，直到从纪元开始的指定秒数。如果没有提到秒，则计算时间直到现在。结构属性表如下。

Index   Attributes   Values
 0        tm_year     2008
 1        tm_mon      1 to 12
 2        tm_mday     1 to 31
 3        tm_hour     0 to 23
 4        tm_min      0 to 59
 5        tm_sec      0 to 61 (60 or 61 are leap-seconds)
 6        tm_wday     0 to 6 
 7        tm_yday     1 to 366
 8        tm_isdst    -1, 0, 1 where -1 means 
                               Library determines DST

Python3

# Python code to demonstrate the working of
# time() and gmtime()
 
#  importing "time" module for time operations
import time
 
# using time() to display time since epoch
print ("Seconds elapsed since the epoch are : ",end="")
print (time.time())
 
 
# using gmtime() to return the time attribute structure
print ("Time calculated acc. to given seconds is : ")
print (time.gmtime())

Python3

# Python code to demonstrate the working of
# asctime() and ctime()
 
#  importing "time" module for time operations
import time
 
# initializing time using gmtime()
ti = time.gmtime()
 
# using asctime() to display time acc. to time mentioned
print ("Time calculated using asctime() is : ",end="")
print (time.asctime(ti))
 
 
# using ctime() to display time string using seconds
print ("Time calculated using ctime() is : ", end="")
print (time.ctime())

Python3

# Python code to demonstrate the working of
# sleep()
 
#  importing "time" module for time operations
import time
 
# using ctime() to show present time
print ("Start Execution : ",end="")
print (time.ctime())
 
# using sleep() to hault execution
time.sleep(4)
 
# using ctime() to show present time
print ("Stop Execution : ",end="")
print (time.ctime())

输出：

Seconds elapsed since the epoch are : 1470121951.9536893
Time calculated acc. to given seconds is : 
time.struct_time(tm_year=2016, tm_mon=8, tm_mday=2,
tm_hour=7, tm_min=12, tm_sec=31, tm_wday=1, 
tm_yday=215, tm_isdst=0)

3. asctime(“time”) :- 该函数采用由 gmtime() 生成的时间属性字符串，并返回一个表示时间的 24 个字符的字符串。 4. ctime(sec) :- 此函数返回一个24字符的时间字符串，但以秒为参数并计算时间，直到提到的秒。如果没有传递参数，则计算时间直到现在。

Python3

# Python code to demonstrate the working of
# asctime() and ctime()
 
#  importing "time" module for time operations
import time
 
# initializing time using gmtime()
ti = time.gmtime()
 
# using asctime() to display time acc. to time mentioned
print ("Time calculated using asctime() is : ",end="")
print (time.asctime(ti))
 
 
# using ctime() to display time string using seconds
print ("Time calculated using ctime() is : ", end="")
print (time.ctime())

输出：

Time calculated using asctime() is : Tue Aug  2 07:47:02 2016
Time calculated using ctime() is : Tue Aug  2 07:47:02 2016

5. sleep(sec) :- 此方法用于在参数中指定的时间内停止程序执行。

Python3

# Python code to demonstrate the working of
# sleep()
 
#  importing "time" module for time operations
import time
 
# using ctime() to show present time
print ("Start Execution : ",end="")
print (time.ctime())
 
# using sleep() to hault execution
time.sleep(4)
 
# using ctime() to show present time
print ("Stop Execution : ",end="")
print (time.ctime())

输出：

Start Execution : Tue Aug  2 07:59:03 2016
Stop Execution : Tue Aug  2 07:59:07 2016