Introducing Python / Chapter 12

time_lists.py

from timeit import timeit

def make_list_1():
    result = []
    for value in range(1000):
        result.append(value)
    return result

def make_list_2():
    result = [value for value in range(1000)]
    return result

print('time_list_1 takes', timeit(make_list_1, number=1000), 'sec')
print('time_list_2 takes', timeit(make_list_2, number=1000), 'sec')