# Learn Algorithm Design by Building a Shortest Path Algorithm - Step 47

### Tell us what’s happening:

no matter what I do there is a error or i’m missing slice syntax

``````my_graph = {
'A': [('B', 3), ('D', 1)],
'B': [('A', 3), ('C', 4)],
'C': [('B', 4), ('D', 7)],
'D': [('A', 1), ('C', 7)]
}

def shortest_path(graph, start):
unvisited = list(graph)
distances = {node: 0 if node == start else float('inf') for node in graph}
paths = {node: [] for node in graph}
paths[start].append(start)

while unvisited:
current = min(unvisited, key=distances.get)
for node, distance in graph[current]:
if distance + distances[current] < distances[node]:
distances[node] = distance + distances[current]

# User Editable Region

if paths[node] and paths[node][-1] == node:
slice(paths_copy = paths[current[:]])

# User Editable Region

else:
paths[node].extend(paths[current])
paths[node].append(node)
unvisited.remove(current)

print(f'Unvisited: {unvisited}\nDistances: {distances}\nPaths: {paths}')

shortest_path(my_graph, 'A')

``````

User Agent is: `Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36`

### Challenge Information:

Learn Algorithm Design by Building a Shortest Path Algorithm - Step 47

To slice a list using the slice syntax you need to write a pair of square brackets after the list:
`my_list[start:stop:step]`
If you want to copy the entire list you can simply avoid to specify the values for `start`, `stop` and `step` and use
`my_list[:]` or `my_list[::]`

Reset the code for this step and just use the slice syntax on the list you want to copy.
The instructions here will be clarified soon. They are a bit cryptic.

I still can’t get it
``` paths_copy = slice(paths[current][:]) ```

It’s confusing because there are two things:

1. Slice function
2. Slice syntax

You are trying to use the function, but that’s not what is required here. Do not use `slice()`

@Dario_DC demonstrated slice syntax above, you can see it does not use `slice()`. You can read more about slice syntax here: