Timer

The code in this notebook helps with measuring time.

Prerequisites

• This notebook needs some understanding on advanced concepts in Python, notably
  • classes
  • the Python with statement
  • measuring time

Measuring Time

The class Timer allows to measure the elapsed time during some code execution. A typical usage looks as follows:

from Timer import Timer

with Timer() as t:
    function_that_is_supposed_to_be_timed()

print(t.elapsed_time())

def clock():
    try:
        return time.perf_counter()  # Python 3
    except:
        return time.clock()         # Python 2

class Timer(object):
    # Begin of `with` block
    def __enter__(self):
        self.start_time = clock()
        self.end_time = None
        return self

    # End of `with` block
    def __exit__(self, exc_type, exc_value, tb):
        self.end_time = clock()

    def elapsed_time(self):
        """Return elapsed time in seconds"""
        if self.end_time is None:
            # still running
            return clock() - self.start_time
        else:
            return self.end_time - self.start_time

Here's an example:

def some_long_running_function():
    i = 1000000
    while i > 0:
        i -= 1

print("Stopping total time:")
with Timer() as t:
    some_long_running_function()
print(t.elapsed_time())

Stopping total time:
0.040447834006045014

print("Stopping time in between:")
with Timer() as t:
    for i in range(10):
        print(t.elapsed_time())

Stopping time in between:
3.0320079531520605e-06
2.5946006644517183e-05
4.369599628262222e-05
6.079100421629846e-05
7.736199768260121e-05
9.499400039203465e-05
0.0001115360064432025
0.00012764200801029801
0.00014470599126070738
0.0001609699975233525

That's it, folks – enjoy!