from functools import reduce
class MyList:
    def __init__(self, *args):
        self.items = list(args)

    def __len__(self):
        return reduce(lambda acc, x: acc + (sum(x) if hasattr(x, '__iter__') else x), [x*2 for x in self.items])

my_list = MyList(1, 2, 3, [4, 5])
print(len(my_list))

a = {1, 2, 9}
b = {2, 3, 9}
c = a & b
c.remove(2)
print(*c)

a = {1, 2}
b = {2, 3}
c = (a | b) - (a & b)
d = a ^ b
print(c == d)

a, b = {1, 2}, {2, 3}
c = a - b
d = b - a
print(*(c & d), *(c | d))

my_list = [1, 2, 3, 4, 5]
r = [x % 3 for x in my_list]
print(sum(r))

def f():
    def g():
        nonlocal x
        x = 2
    g()
    print(x)
        
f()

def f():
    def g():
        global x
        x = 2
    g()
    print(x)
        
f()

def f(name="", value=0):
    import sys
    func_name = sys._getframe(0).f_code.co_name
    func = sys._getframe(1).f_locals[func_name]
    setattr(func, name, value)
    return sum(func.__dict__.values())

print(f("x", 1), f("y", 2), f())

a = b, c = [1, 2]
a[0] = 10
print(b, c)

def f():
    x = 1
    def g():
        x += 1
    g()
    print(x)
print(f())

def func(а, b):
    а = 2
    b = b[:] 
    b[0] = 10
    
a, b = [0], [1]
func(a, b)
print(a, b)