def add_item(val, target=[]):
    target.append(val)
    return target

print(add_item(1), add_item(2))

a = [[1, 2], [3, 4]]
b = list(a)
a[0][1] = 5
print(b[0][1])

def modify(n):
    n = n + 5
    n *= 2
    return n

x = 10
result = modify(x) + x
print(result)

print(1 in [1, 2] == True)

class A:
    def __init__(self):
        self.__x = 1
        
    def get_x(self):
        return self.__x

class B(A):
    def __init__(self):
        super().__init__()
        self.__x = 2

b = B()
print(b.get_x())

tpl = ([],)
tpl[0].extend([1, 2])
print(tpl)

class A:
    x = 1

class B(A):
    pass

class C(A):
    pass

B.x = 2
A.x = 3

print(C.x)

data = [1, 2, 3]
data += [4, 5]
data = data[1:-1]
print(sum(data))

class Model:
    val = 1
    lst = [val for _ in range(3)]

print(Model.lst)

data = [1, 2, 3]
data += [4, 5]
data = data[1:-1]
print(sum(data))