a = None
print(a is None is True)

a = None
b = None
a is b is None

a = {0, 1, 2}
print(a[1])

a = (100, 2)
b = (1, 103)
print(a > b)

def f(p, q):
    return p + q

x = list(map(f, ('a', 'b', 'c'), ('x', 'y', 'z')))
print(x[1])

x = {1: "A", 3: "B"}
y = {2: "C", 3: "D", 4: "E"}
d = {**x, **y}
vals = sorted(d.values())
print(*vals)

def outer():
    x = "local"
    def inner():
        nonlocal x
        x = "nonlocal"
        print(x, end=" ")
    inner()
    print(x)
outer()

def gen():
    for i in range(3):
        yield i
for item in gen():
    print(item, end=" ")

import itertools
list1 = [1, 2]
list2 = ['a', 'b']
result = list(itertools.product(list1, list2)) 
print(result)

from functools import reduce
class MyList:
    def __init__(self, *args):
        self.items = list(args)

    def __len__(self):
        return reduce(lambda acc, x: acc + (sum(x) if hasattr(x, '__iter__') else x), [x*2 for x in self.items])

my_list = MyList(1, 2, 3, [4, 5])
print(len(my_list))