"""
ExecutionTime
This class is used for timing execution of code.
For example:
    timer = ExecutionTime()
    print 'Hello world!'
    print 'Finished in {} seconds.'.format(timer.duration())
"""

import time
import random
class ExecutionTime:
    def init(self):
        self.start_time = time.time()

def duration(self):
    return time.time() - self.start_time



---- run code ----
timer = ExecutionTime()
sample_list = list()
my_list = [random.randint(1, 888898) for num in
           range(1, 1000000) if num % 2 == 0]
print('Finished in {} seconds.'.format(timer.duration()))</pre>