How to time python

Timing is a critical part of understanding the performance of your program. This article discusses timing methods in Python 2 and Python 3.

Common timing method for python2 and python3 (Recommended learning: Python video tutorial)

Because of python2 It is different from the timing function in 3. It is recommended to use timeit.default_timer() in the timeit module

According to the official documentation of timeit.default_timer(), the timing accuracy is related to the platform and the function used:

"Defined in the default timer, in different ways for different platforms. On Windows, time.clock() has microsecond precision, but time.time() precision is 1/60s .On Unix, time.clock() has 1/100s accuracy, and time.time() is far more accurate. On other platforms, default_timer() measures wall clock time, not CPU time. This Means that other processes on the same computer may affect timing."

In python2:

if sys.platform == "win32":
    # On Windows, the best timer is time.clock()
    default_timer = time.clock
else:
    # On most other platforms the best timer is time.time()
    default_timer = time.time

In python3:

default_timer = time.perf_counter

It can be seen from the official documentation of time.clock():

"time.clock() is obsolete after python3.3 version: the behavior of this function is affected by the platform, use time.perf_counter()" Or time.process_time() instead to get a better defined behavior, depending on your needs. ”

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