# dict_order_vs_loop_order.py

# dict_order_vs_loop_order.py

from time import perf_counter

old_list = ('a', 'b', 'a', 'b', 'c', 'a', '3', 'd', 'b', '2', 'e', 'c', 'a', '1', 'e', 'c', '3')
for i in '.'*20:
    print(tuple(dict.fromkeys(old_list)))

old_list = [old_list for _ in range(2_000_000)]

for i in '.'*60:
    start = perf_counter()
    new_list = tuple(dict.fromkeys(old_list))
    dict_time = perf_counter()-start

    start = perf_counter()
    new_list = []
    for item in old_list:
        if item not in new_list:
            new_list.append(item)
    loop_time = perf_counter()-start

    print(f"")
    print(f"dict_time = {dict_time:0f}")
    print(f"loop_time = {loop_time:0f}")
    a, b = 'dict', 'loop'
    t = dict_time/loop_time
    if dict_time > loop_time:
        a, b = b, a
        t = loop_time/dict_time
    print(f"{a} time is {t:0f} times faster then {b}")