a = [1, 5, 7]
b = [2, 4, 6]
c = a.extend(b)
print(c)

d = {1: 'first', 2: 'second'}
d[4] = None
print(len(d))

x = 5
print([y//2 for y in range(6)][x])

3^2

print((lambda x: print("hello", end="") or x*2)("hi"))

name = {
    124: "A",
    444: "B",
    952: "C"}
user_id = 375
print(name.get(user_id, "D"))

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

X = D()

class X:
    def __init__(self):
        print('X', end='')
class Y:
    def __init__(self):
        print('Y', end='')
class Z(X, Y):
    def __init__(self):
        print('Z', end='')
        super().__init__()

z = Z()

class A:
    def __init__(self):
        self.x = 1

a = A()
b = a
b.x = 5
print(a.x)

class A:
    def hello(self):
        return "Hello from A"

class B(A):
    def hello(self):
        return "Hello from B"

b = B()
print(b.hello())