%run
%run C:UsersUserDesktophello.py

hello world

%timeit

%timeit L = [i for i in range(1000)]

29.1 µs ± 2.98 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)

%timeit L = [i for i in range(1000000)]

52 ms ± 911 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)

%timeit L = [i for i in range(10)]

806 ns ± 284 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)

%% timeit

%%timeit
L = []
for i in range(1000):
    L.append(i)

236 µs ± 62.6 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)

%time L = [i**2 for i in range(1000)]

Wall time: 0 ns

%%time
L = []
for i in range(1000):
    L.append(i**2)

Wall time: 13.5 ms

import random
L = [random.random() for i in range(100000)]
%time L.sort()

Wall time: 18.7 ms

%lsmagic