from functools import partial
from operator import gt
gt = partial(gt, 0)
l = list(filter(gt, [x for x in range(-2, 3) 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)))

[((x // y):) for х in range(3) if х % 2 == 0 for y in range(3) if y % 2 == 1]

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

listoftuple = [(0, 1, 2), (1, 2, 3)]
string1 = [b  for (a, b, c) in listoftuple]
string2 = list(map((lambda row: row[1]), listoftuple))
print(string1 == string2, sum(string1))

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)

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)])

from collections import defaultdict
d = defaultdict(list)
d['a'].append(1)
d['a'].append(2)
d['b'].append(3)
sum((len(d['a']*3), len(d['b'])*5))