[Tutor] Don't Understand Problem

[kcberry]

So I am new to this, and I have a book call /Hello Python by Anthony Briggs/.
It is a good book but it is using Python 2 I think and I can't get my code
to work. I get an "AttributeError: 'range' object has no attribute
'remove'". I have tried to look it up on the web with no luck. Can someone
help me understand this . 


**********
#Setting up the cave
from random import choice

cave_numbers = range(0,20)
caves = []
for i in cave_numbers:
    caves.append([])

#Setting up cave network
unvisited_caves = range(0,20)
current = 0
visited_caves = [0]
*unvisited_caves.remove(0)*

#Main loop of linking cave network
while unvisited_caves != []:
#Picking a random visited cave
    i = choice(visited_caves)
    if len(caves[i]) >= 3:
        continue

#link to unvisited caves
    next_cave = choice(unvisited_caves)
    caves[i].append(next_cave)
    caves[next_cave].append(i)

#Marking cave as visited
    visited_caves.append(next_cave)
    *unvisited_caves.remove(next_cave)*

#Progress report
    for number in cave_numbers:
        print( number, ":", caves[number])
    print('----------')

for i in cave_numbers:
    while len(caves[i]) < 3:
        passage_to = choice(cave_numbers)
        caves[i].append(passage_to)

    for number in cave_numbers:
        print(number, ":", caves[number])
    print('---------')

print(caves)



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