import timeit

# 1. b = b + [a]
# 2. b += [a]
# 3. b = [*b, *a]
# 4. b.extend([a])

times = 10000
setup="a = [11, 34, 22, 34]; b = [3, 4, 5, 4, 3, 32, 3]"

for test in ["b = b + [a]", "b += [a]", "b = [*b, *a]", "b.extend([a])"]:
    t = timeit.Timer(test, setup=setup)
    print(f'{test:14s}: {t.timeit(times)}')