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.
Timeit timeit wall clock.
Now let us look at a way to use this amazing library to compare two functions.
On unix clock has 1 100th of a second granularity and time is much more precise.
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.
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 windows time clock has microsecond granularity but time 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.
On either platform default timer measures wall clock time not the cpu time.
27 5 usec per loop python3 m timeit join map str range 100 10000.
The wall clock time is also called elapsed or running time.
Python3 m timeit join str n for n in range 100 10000 loops best of 5.
On either platform default timer measures wall clock time not the cpu.
On windows time clock has microsecond granularity but time time s granularity is 1 60th of a second.
Another important concept is the so called system time which is measured by the system clock.
It is used to get the execution time taken for the small code given.
The timeit and time magics.
Compared to the cpu time the wall clock time is often longer because the cpu executing the measured program may also be executing other program s instructions at the same time.
Timeit method is available with python library timeit.
On either platform the default timer functions measure wall clock time not the cpu time.
The timeit and time magics.
The following example shows how the command line interface can be used to compare three different expressions.
30 2 usec per loop python3 m timeit join str n for n in range 100 10000 loops best of 5.
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On unix time clock has 1 100th of a second granularity and time time is much more precise.