values = [8, 3, 1]
group = {2, 7} 
def f(values, group):
    count = 0
    def g(x):
        nonlocal count
        if x in group:
            count += 1  
            return (0, x)
        return(1, x)
    values.sort(key=g)
    return count 
count = f(values, group)
print(count)

def f():
    yield 0
    yield from [1, 2]
    yield 3
print(*f())

s = [1, 2, 3, 4]
s.insert(2, 100)
del s[:2]
s.pop()
s.remove(3)
print(*s)

s = [1, 2, 3]
s.append(3)
s = list(sorted(set(s)))
s.pop()
s.remove(1)
print(*s)

s = [1, 2, 1]
print(s.index(1), s.index(2))

s = [1, 2, 1, 1, 1, 3]
print(s.count(1) + s.index(2))

x = [0, None, 1]
y = []
s = (any(x), any(y)) == (all(y), all(x))
print(s)

x = [0, None]
y = ["abc", 1]
s = (any(x), any(y)) == (all(x), all(y))
print(s)

class A:
    def f(self):
        print('A', end="")
class B:
    def f(self):
        print('B', end="")
class C(A):
    def f(self):
        print("C", end="")
        super().f()
        self.__class__.__bases__ = (B,)
x = C()
_ = x.f(), x.f()

class B:
    def __init__(self) : 
        print ('В', end='')
        super().__init__()
class C:
    def __init__(self): 
        print('C', end='')
        super().__init__ ()
class D(B, C):
    def __init__(self):
        print('D', end='') 
        B.__init__(self)
        C.__init__(self)
X = D()