def make_counter():
    count = 0
    def increment():
        nonlocal count
        count += 1
        return count
    return increment

c1 = make_counter()
c2 = make_counter()
c1()
print(c1(), c2())

a = [1, 2, 3]
a[1:1] = [4, 5]
print(a)

data = {1: "A", True: "B"}
print(data[1])

print(round(1.5), round(2.5))

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

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

class A:
    def __new__(cls):
        return 42
        
    def __init__(self):
        print("Init")

print(A())

val = 10

def update():
    global val
    val = 20
    del val

update()

try:
    print(val)
except NameError:
    print("NameError")

def swap(a, b):
    return b, a

x, y = 10, 20
x, y = swap(x, y)
x, y = swap(y, x)
print(x + y)

x = 1

def func():
    x = 2
    print(globals()['x'])

func()

lst = [x for x in range(10) if x % 2 == 0 if x % 3 == 0]
print(lst)