Learn Algorithm Design by Building a Shortest Path Algorithm - Step 31

Python
1

Tell us what’s happening:

i don’t know how to do next, can someone help me ?

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 = []
    distances = {}
    for node in graph:
        unvisited.append(node)
        if node == start:
            distances[node] = 0
        else:
            distances[node] = float('inf')
    print(f'Unvisited: {unvisited}\nDistances: {distances}')
    

# User Editable Region

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Challenge Information:

Learn Algorithm Design by Building a Shortest Path Algorithm - Step 31

2

can you explain what issue are you having? what do you find confusing of the instructions and implementing them?

3

Now, I have to call my function passing my_graph and ‘A’ as the arguments.

4

Ok, and what issue are you having with calling the function?

5

I tried this: shortest_path(my_graph, ‘A’) and the code doesn’t pass

6

and where did you try that? can you show your code?

7 
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 = []
    distances = {}
    for node in graph:
        unvisited.append(node)
        if node == start:
            distances[node] = 0
        else:
            distances[node] = float('inf')
    print(f'Unvisited: {unvisited}\nDistances: {distances}')
    shortest_path(my_graph, 'A')
8

I’ve edited your code for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

Pre-formatted-text
Pre-formatted-text1356×380 401 KB

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').

9

you can’t call the function inside the function for it to work, remember the importance of indentation