Learn Algorithm Design by Building a Shortest Path Algorithm - Step 29

Python
1

Tell us what’s happening:

Describe your issue in detail here.
I don’t really know what im doing wrong here

Your code so far

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


# User Editable Region

def shortest_path(graph, start):
    unvisited = list(graph)
    distances = {}
    paths = {for key in graph}
    
    print(f'Unvisited: {unvisited}\nDistances: {distances}')
    
shortest_path(my_graph, 'A')

# User Editable Region

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Challenge Information:

Learn Algorithm Design by Building a Shortest Path Algorithm - Step 29

2

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3

Good but you are missing an element from this dict comprehension:

{key: val for key in dict}
{<do this> for <this> in <that>}

https://www.geeksforgeeks.org/python-dictionary-comprehension/

1 Like
4

Hi, thanks for the reply:
I tried changing it but I still cant get it right

paths = {key: [] for key in graph}

I added an empty list before the ‘for’ because it says to add an empty list to the key, maybe I haven`t fully understood the problem because I can’t figure it out.

Edit: Nevermind I just deleted it and wrote it again and it worked, there was probably an error with the spacing

2 Likes
5

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