from functools import partial
from operator import lt
gt = partial(lt, 0)
l = list(filter(gt, [x for x in range(-1, 2) if x <= 0]))
print(l)

M = [[1, 2], [3, 4]]
N = [[5, 6], [7, 8]]
sum([col1*col2 for row1, row2 in zip(M, N) for col1, col2 in zip(row1, row2)])

#1
[х ** 2 for х in range(5) if х % 2 == 0]
#2
list(map(lambda x: x**2, filter(lambda x: x % 2 == 0, range(5))))
#3
res = []
for x in range(5):
    if x % 2 == 0:
        y = x**2
        res.append(y)
print(res)
#4
list(map(lambda x: x ** 2 % 4 == 0, range(5)))

[(х, у) for х in range(3) if х % 2 == 0 for у in range(3) if у % 2 == 1]

res = [х ** у for х in [2, 3] for у in [2, 3]]
print(res)

listoftuple = [(0, 1, 2), (1, 2, 3)]
s1 = [b  for (a, b, c) in listoftuple]
print(s1)
s2 = list(map(lambda row: row[1], listoftuple))
print(s1 == s2, sum(s1))

def gen():
    for i in range(1, 5):   
        x = yield i
        if x:
            yield x**2
g = gen()
v = g.send(g.send(next(g) + next(g)) + next(g))
print(v)

#1
sorted(x ** 2 for x in range(4))

#2
sorted((x ** 2 for x in range(4)))

#3
sorted((x ** 2 for x in range(4)), reverse=True)

#4
sorted(x ** 2 for x in range(4), reverse=True)   

#5
list(x ** 2 for x in range(4))

import math
sum(map(math.sqrt, (x ** 2 for x in range(3))))

def f(arr):
    return 0 if not arr else arr[0] + f(arr[1:])
print(f([1, 2]))