def f(n):
    return 0 if n == 0 else 2**n + f(n-1)
print(f(3))

def f():
    x = 1
    y = 1
    def g():
        nonlocal x
        x, y = 2, 2
    g()
    print(x, y)

f()

try:
    my_x = 1
    raise Exception('исключение') #1
except Exception as my_err:
    print(my_err)                 #2
    my_y = 2
print(my_x)                       #3
print(my_y)                       #4
print(my_err)                     #5

x = 1
def f1():
    return x
def f2():
    global x
    x = 2
    return x
def f3():
    global x
    return x
print(f1(), f2(), f3(), f1())

#testmod.py
x = 0
def f1():
    x = 10
def f2():
    global x
    x += 1   
def f3():
    import testmod
    testmod.x += 1
def f4():
    import sys
    sys.modules["testmod"].x += 1

#runmod.py
import testmod as t
t.f1();t.f2();t.f3();t.f4()
print(t.x)

def maker(n):
    s = 0
    def g(x=n):
        nonlocal s
        s += x
        return s
    return lambda x: s + x + g()
f = maker(2)
print(f(3), f(3))

f = lambda x, f=lambda x: x**2:  f(x)
print(f(5), f(5, f))

def maker(n, h=lambda: 3):
    return lambda f=h: f()**n, lambda f=h: n**f()
f, g = maker(2)
r = f(g) + g(f)
print(r)

funcs = [lambda x: x**i for i in range(2, 4)]
print(funcs[0](5))

def f():
    def g():
        nonlocal x
        x = 2
    g()
    print(x)
        
f()