#Task 1
import time
def timer(func):
    def inside_func(*args, **kwargs):
        st = time.time()
        func(*args)
        fin = time.time()
        print(f'Function worked for {fin - st} seconds')

    return inside_func


#Task 2

def cache(f):
    D = dict()
    def inside_f(*args):
        if args not in D:
            D[args] = f(*args)
        return D[args]
    return inside_f

#Task 3

def logging(f):
    def inside(*args):
        result = f(*args)
        with open('log.txt', 'a+') as file:
            print(f'The function has been called {f.__name__}, the result of its work is - {result}', file=file)
            return result

    return inside

#Task 4

def retry(sec, times):
    def decor(f):
        def inside(*args):
            for i in range(times):
                if f(*args) is not None:
                    return f(*args)
                time.sleep(sec)
            return None
        return inside
    return decor