deque против list

from collections import deque
from time import perf_counter

TIMES = 10_000
a_list = []
a_deque = deque()

def average_time(func, times):
total = 0.0
for i in range(times):
start = perf_counter()
func(i)
total += (perf_counter() - start) * 1e9
return total / times

list_time = average_time(lambda i: a_list.insert(0, i), TIMES)
deque_time = average_time(lambda i: a_deque.appendleft(i), TIMES)
gain = list_time / deque_time

print(f"list.insert()      {list_time:.6} ns")
print(f"deque.appendleft() {deque_time:.6} ns  ({gain:.6}x faster)")