Now that we've had an overview of what performance complexity is and also of performance testing and measurement tools, let us take an actual look at the various ways of measuring performance complexity with Python.
One of the simplest time measurements can be done by using the
time command of a POSIX/Linux system.
This is done by using the following command line:
$ time <command>
For example, here is a screenshot of the time it takes to fetch a very popular page from the web:
See that it shows three classes of time output, namely