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)

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

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

text = "A  B"
print(len(text.split()), len(text.split(" ")))

d = {'a': 1, 'b': 2, 'c': 3}
try:
    for k in d:
        del d[k]
    print(len(d))
except RuntimeError:
    print("RuntimeError")

lst = [10, 20, 30, 40, 50]
del lst[1::2]
print(lst)

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

keys = ['a', 'b', 'c']
vals = [1, 2]
d = {k: v for k, v in zip(keys, vals)}
print(d)

res = map(lambda x: x * 2, [1, 2])
print(list(res))

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

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

print(Model.lst)