What will this code do?

a = [1, 5, 7]
b = [2, 4, 6]
c = a.extend(b)
print(c)

What will this code do?
d = {1: 'first', 2: 'second'}
d[4]='fourth'
print(len(d))

What will this code do?

x = 5
print([y // 2 for y in range(6)][x])

What will this code do?

print((lambda x: print("hello", end="") or x*2)("hi"))

What will this code do?

import numpy as np
a = np.array([[10, 9],[2, 8]])
print(np.min(a))

What will this code do?

import numpy as np
matrix = np.array([[1, 2, 3],
                   [4, 5, 6],
                   [7, 8, 9]])
print(matrix[1, 1])

What will this code do?

name = {
    124: "Сергей",
    444: "Анатолий",
    952: "Николай"}
user_id = 375
print(name.get(user_id, "Алексей"))

What will this code do?

s = list(map(lambda x: x * x, (1, 2, 3, 4)))
print(s)

What will this code do?

import numpy as np
a = np.array([[2, 4],[2, 8]])
print(np.mean(a))