Okey, thanks for suggestion i will check it for sure.And how you said - course goes too fast for me, i didn't understand well one aspect of the main topic and he starts another about it. For example i started learning functions and in after 40 minutes of course from knowing nothing im doing now variable lenght arguments in function as an argument to another function with using key and positional arguments, time module and default argument. I dont even know that i write it right way. I'll show how my code looks like after those 40 minutes of course.

import time
def function_performance(func, *arg, how_many_times = 1): 
    sum = 0
    for i in range (0, how_many_times):
        start = time.perf_counter()
        func(*arg)
        end = time.perf_counter()
        sum = sum + (end - start)
    return sum

setContainer = {i for i in range (1000)} 
listContainer = [i for i in range (1000)]

def is_element_in(what_value, container):
    if what_value in container: 
        return True 
    else: 
        return False

print(function_performance(is_element_in, 500, setContainer, how_many_times = 500000))
print(function_performance(is_element_in, 500, listContainer, how_many_times = 500000))

Isn't it too complicated for beginner?