e = [ [1,2,[3,4,[5,6],7],8,9], 10]
def deep_copy(mylst):
        
    # End of the list
    if mylst == []:
        return []
    
    # I have reached an integer/string
    elif type(mylst) != list:
        return [mylst]

    # This is a list, and the index 0 element is a list,
    # so I will need to go down a layer 
    elif type(mylst[0]) == list:
        return [deep_copy(mylst[0])] + deep_copy(mylst[1:])

    else:
        # [0] will return the [mylst], and [1:] continues 
        return deep_copy(mylst[0]) + deep_copy(mylst[1:]) 

b = deep_copy(e)
e[0][2][2][0] = 100
print(e)
# >>> [[1, 2, [3, 4, [100, 6], 7], 8, 9], 10]
print(b)
# >>> [[1, 2, [3, 4, [5, 6], 7], 8, 9], 10]


e = [ [1,2,[3,4,[5,6],7],8,9], 10]
b = e.copy()
e[0][2][2][0] = 100
print(e)
# >>> [[1, 2, [3, 4, [100, 6], 7], 8, 9], 10]
print(b)
# >>> [[1, 2, [3, 4, [100, 6], 7], 8, 9], 10]