How to measure time taken between lines of code in python?

If you want to measure CPU time, can use time.process_time() for Python 3.3 and above:

import timestart = time.process_time()# your code here    print(time.process_time() - start)

First call turns the timer on, and second call tells you how many seconds have elapsed.

There is also a function time.clock(), but it is deprecated since Python 3.3 and will be removed in Python 3.8.

There are better profiling tools like timeit and profile, however time.process_time() will measure the CPU time and this is what you're are asking about.

If you want to measure wall clock time instead, use time.time().

You can also use time library:

import timestart = time.time()# your code# endprint(f'Time: {time.time() - start}')

With a help of a small convenience class, you can measure time spent in indented lines like this:

with CodeTimer():   line_to_measure()   another_line()   # etc...

Which will show the following after the indented line(s) finishes executing:

Code block took: x.xxx ms

UPDATE: You can now get the class with pip install linetimer and then from linetimer import CodeTimer. See this GitHub project.

The code for above class:

import timeitclass CodeTimer:    def __init__(self, name=None):        self.name = " '"  + name + "'" if name else ''    def __enter__(self):        self.start = timeit.default_timer()    def __exit__(self, exc_type, exc_value, traceback):        self.took = (timeit.default_timer() - self.start) * 1000.0        print('Code block' + self.name + ' took: ' + str(self.took) + ' ms')

You could then name the code blocks you want to measure:

with CodeTimer('loop 1'):   for i in range(100000):      passwith CodeTimer('loop 2'):   for i in range(100000):      passCode block 'loop 1' took: 4.991 msCode block 'loop 2' took: 3.666 ms

And nest them:

with CodeTimer('Outer'):   for i in range(100000):      pass   with CodeTimer('Inner'):      for i in range(100000):         pass   for i in range(100000):      passCode block 'Inner' took: 2.382 msCode block 'Outer' took: 10.466 ms

Regarding timeit.default_timer(), it uses the best timer based on OS and Python version, see this answer.