一，兩個函數的文檔：
1，time.time():
-
- time. time ( )
-
Return the time in seconds since the epoch as a floating point number. Note that even though the time is always returned as a floating point number, not all systems provide time with a better precision than 1 second. While this function normally returns non-decreasing values, it can return a lower value than a previous call if the system clock has been set back between the two calls.
-
—————————————————————————————————————————————
- time. time ( )
-
返回從紀元（1970.1.1）至今的秒數。雖然這個函數的返回值永遠為浮點數，但並不是所有系統提供的秒數都會精確到小數點以后。一般情況下這個函數的返回值不會小於它上一次被調用的返回值，除非系統時鍾在兩次調用之間發生了重置。
-
2，time.clock():
-
-
- time. clock ( )
-
On Unix, return the current processor time as a floating point number expressed in seconds. The precision, and in fact the very definition of the meaning of “processor time”, depends on that of the C function of the same name, but in any case, this is the function to use for benchmarking Python or timing algorithms.
On Windows, this function returns wall-clock seconds elapsed since the first call to this function, as a floating point number, based on the Win32 function QueryPerformanceCounter(). The resolution is typically better than one microsecond.
-
—————————————————————————————————————————————
- time. clock ( )
-
在Unix 中，將當前的處理器時間以浮點數的形式返回，單位為秒。它的精確度（准確地說是“處理器時間”的精確度）取決於同名的C函數，無論如何，這個函數是python關於時間計算的標尺。
-
WINDOWS中，第一次調用，返回的是進程運行的實際時間。而第二次之后的調用是自第一次調用以后到現在的運行時間。（實際上是以WIN32上QueryPerformanceCounter()為基礎，它比毫秒表示更為精確）
- 二，用法及總結
- 1，在Windows中，time.clock()更精確；
- 2，這兩個函數不可以混合使用；
-
（未完待續）