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)

t = (1, 2, [3, 4])
t[2].append(5)
print(t)

data = {"x": 10, "y": 20}
a, b = data
print(a, b)

def increment(x):
    x += 10
    return x

value = 5
new_value = increment(value)
print(value + new_value)

grades = {'Alice': 85, 'Bob': 90}
grades['Charlie'] = grades.get('Alice', 0) + 5
del grades['Alice']
print(sum(grades.values()))

print(all([]))

x = "global"
res = [x for x in ["local", "scope"]]
print(x)

data = {'a': [1, 2], 'b': [3, 4]}
data['c'] = data['a'] + data['b']
data['a'].append(5)
print(len(data['c']))

fruits = ['apple', 'banana', 'cherry']
fruits[1] = fruits[0] + fruits[2]
print(len(fruits[1]))

from itertools import islice

def infinite_seq():
    n = 1
    while True:
        yield n
        n *= 2

gen = infinite_seq()
result = list(islice(gen, 5))
print(sum(result))