I'm working on this problem, but I cannot figure out the second part. I tried using reverse list but it did not work out how I planned it.

Given a list L (e.g. [1,2,3,4]), write a program that generates the following nested lists:

1. L1 = [[1],[1,2],[1,2,3],[1,2,3,4]],
2. L2 = [[4],[3,4],[2,3,4],[1,2,3,4]].

My code that I have so far:

mylist=[,1,2,3,4] 
print("Orginal list L=",mylist) 
n=len(mylist) 
l1=[] 
l2=[] 


for x in range(1,n+1,1):
    l1.append(mylist[0:x]) 
print("L1=",l1) #prints final product of l1


mylist.reverse() #this is where i get messed up
for x in range(1,n+1,1): 
    l2.append(mylist[0:x]) 
print("L2=",l2)