data = [5, 10, 15, 20]
data.extend([x // 2 for x in data[:2]])
print(sum(data))

class MetaClass(type):
    def __new__(cls, name, bases, dct):
        dct['meta_value'] = 100
        return super().__new__(cls, name, bases, dct)
    
    def __init__(cls, name, bases, dct):
        cls.meta_value += len(name)

class A(metaclass=MetaClass):
    pass

class B(metaclass=MetaClass):
    pass

print(A.meta_value + B.meta_value)

gen = (x for x in range(3))
print(list(gen), list(gen))

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

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

print(Model.lst)

x = [1, 2, 3, 4, 5]
x[::2] = [10, 20, 30]
print(x)

print(all([]))

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

gen = (x for x in range(3))
print(list(gen), list(gen))

print(any([0, "", False]))