import time
time.asctime((2021, 2, 23, 12, 0, 0, 1, 0, 0))

def f(**x): 
    return sum(x.values())
s = f(a=1, b=2) + f(x=2, y=1, z=0)
print(s)

x = (i**2 for i in range(1, 100) if not i % 3)
y = (i for i in x if not i % 5)
print(next(y))

import hashlib
m = hashlib.sha256()
m.update(b"hello")
print(m.digest_size, len(m.hexdigest()))

import datetime
t1 = datetime.date(2021, 3, 5) - datetime.date(2021, 2, 23)
t2 = datetime.date(2020, 3, 5) - datetime.date(2020, 2, 23)
print((t2 - t1).days)

class A:
    def f(self):
        print('A', end="")
class B:
    def f(self):
        print('B', end="")
class C(A):
    def f(self):
        print("C", end="")
        super().f()
        self.__class__.__bases__ = (B,)
x = C()
_ = x.f(), x.f()

class B:
    def __init__(self) : 
        print ('В', end='')
        super().__init__()
class C:
    def __init__(self): 
        print('C', end='')
        super().__init__ ()
class D(B, C):
    def __init__(self):
        print('D', end='') 
        B.__init__(self)
        C.__init__(self)
X = D()

class A:
    def f(self):
        print("A", end="")
class B(A):
    def f(self):
        print("B", end="")
        super().f()
        A.f(self)
class C(A):
    def f(self):
        print("C", end="")
        super().f()
        A.f(self)
class D(B, C):
    def f(self):
        print("D", end="")
        super().f()
d = D()
d.f()

d = {}
d[2, 3] = "a", "b"

class A:
    x = 1
    l = []
a1, a2 = A(), A()
a1.x = 2
a1.l.append(100)
print(a2.x, len(a2.l))