s = "Hello, world!"
s.find("world", 0, 7) + s.find("world", 5)

class D:
    __slots__ = ['a', 'b']
d = D()
d.a = 1
f = lambda attr: getattr(d, attr, '*')
print(f('a'), f('b'), f('__dict__'))

6 + ~6

class D:
    __slots__ = ["a", "__dict__"]
    def __init__(self):
        self.b = 2
d = D()
d.a = 1
d.c = 3
print(sorted(d.__dict__.values()))

g = (str(i**2) for i in range(1, 4))
print("".join(g) + "".join(g))

f = lambda x: isinstance(x, int)
print(f(1), f(1.0), f(True), f(1j))

(2 << 2) + (20 >> 2)

class MyList(list):
    def __iter__(self):
        return iter(self*2)
m = MyList([1, 2, 3])
print(list(m))

from random import randint
num = randint(10**8, 10**20)
s = bin(num)[2:].replace('0', '\n').replace('1', '\t')
print(s.isspace())