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在Python中处理时间之clock()方法的使用

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Jun 10, 2016 pm 03:11 PM

python time

clock()方法返回当前的处理器时间，以秒表示Unix上一个浮点数。精度取决于具有相同名称的C函数，但在任何情况下，这是使用于基准Python或定时的算法函数。

在Windows中该函数返回，因为这个函数的第一个调用过去挂钟秒钟，作为浮点数，基于Win32函数QueryPerformanceCounter。
语法

以下是clock()方法的语法：

1	`time.clock()`

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参数

返回值

此方法返回当前处理器时间作为浮点数在UNIX秒钟，并在Windows中表示返回这个函数的第一个调用过去挂钟秒钟，作为浮点数。
例子

下面的例子显示了clock()方法的使用。

#!/usr/bin/python
import time
 
def procedure():
  time.sleep(2.5)
 
# measure process time
t0 = time.clock()
procedure()
print time.clock() - t0, "seconds process time"
 
# measure wall time
t0 = time.time()
procedure()
print time.time() - t0, "seconds wall time"

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当我们运行上面的程序，它会产生以下结果：

1 2	`0.0 seconds process time` `2.50023603439 seconds wall time`

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注：并非所有的系统可以测量真实的处理时间。在这样的系统(包括Windows)，因为该程序开始的时间。

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