Python-сообщество

import random
n = int(input("N: "))
d = int(input("D: "))
L = [random.randint(-20,20) for i in range(n)]
M = []
k = 0
L1 = []
#Razdeleniye na D(5)
while k <= len(L):
    if len(L1) <= d:
        if k == 0:
            L1.append(L[k::d])
            k = k + 1
        if n - k >= d:
            L1.append(L[k::d])
            k = k + 1
        else:
            break
    else:
        break
print("_____")
print(L)
print(L1[:-1])
L2 = []
#Sortirovka
for i in range(len(L1)):
    L1[i].sort()
#Dobavleniye obratno v spisok
L_2 = []
for i in range(len(L1[:-1])):
    for j in range(len(L1[i][:-1])):
        #Tut sama problema
        L_2.append(L1[j][i])
        if len(L[j][i]) < len(L[j][0]):
            L_2.append((L1[j][i][:-1]))
            break
print("-----")
print(L1[:-1])
print(L_2)