On either platform default timer measures wall clock time not the cpu time.
Timeit timeit wall clock.
Now let us look at a way to use this amazing library to compare two functions.
All we did was to pass the code as a string and specify the number of iterations to the timeit timeit function.
Another important concept is the so called system time which is measured by the system clock.
The library runs the code statement 1 million times and provides the minimum time taken from the set.
The timeit and time magics.
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On either platform the default timer functions measure wall clock time not the cpu time.
The wall clock time is also called elapsed or running time.
On windows time clock has microsecond granularity but time time s granularity is 1 60th of a second.
The following example shows how the command line interface can be used to compare three different expressions.
Python3 m timeit join str n for n in range 100 10000 loops best of 5.
The difference in default timer function is because on windows clock has microsecond granularity but time s granularity is 1 60th of a second.
On unix time clock has 1 100th of a second granularity and time time is much more precise.
30 2 usec per loop python3 m timeit join str n for n in range 100 10000 loops best of 5.
It is used to get the execution time taken for the small code given.
On unix time clock has 1 100th of a second granularity and time time is much more precise.
27 5 usec per loop python3 m timeit join map str range 100 10000.
The timeit and time magics.
On windows time clock has microsecond granularity but time time s granularity is 1 60th of a second.
Timeit method is available with python library timeit.
On either platform default timer measures wall clock time not the cpu.
On unix time clock has 1 100th of a second granularity and time time is much more precise.
On either platform the default timer functions measure wall clock time not the cpu time.
For this example let us compare two sorting functions one is a simple bubble sort and the other is the python s built in sorted function.