Cant Return Multiple Values In Python

Question

I'm trying to return a tuple from a function but it only returns the first element , When I looked online all the resources said Its done the way I did it , any thoughts ? my code :

def depthFirst(initialState):
    exploredCount = 1
    visitedCount = 0
    frontier=[]
    frontier.append(initialState)
    explored=[]
    while len(frontier) > 0:
        state=frontier.pop()
        explored.append(state)
        visitedCount = visitedCount + 1
        if state in goalStates:
            return state
        nextStates=getNextStates(state)
        for i in range(len(nextStates)):
            if not nextStates[i] in frontier and not nextStates[i] in explored:
                frontier.append(nextStates[i])
                exploredCount = exploredCount + 1

    return [initialState , exploredCount , visitedCount]

Im callingthe function like this :

    ans = depthFirst(state)
    arr = ans[0]
    explored = arr[1]
    visited = arr[2]

So what's the initial value of state? What does getNextStates do? — chepner
– chepner, Commented Nov 26, 2021 at 14:38

Homayoun Hamedmoghadam · Accepted Answer · 2021-11-26 14:43:11Z

1

You're problem is due to the part of the function below:

if state in goalStates:
        return state

The above is ran before the last line of the function is reached. Therefore the function works until the first return (seen above) and only returns state and not the list [initialState , exploredCount , visitedCount]

answered Nov 26, 2021 at 14:43

Homayoun Hamedmoghadam

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1 Comment

h0sny Over a year ago

That was the issue , stupid hahaha , thanks mate

sin tribu · Accepted Answer · 2021-11-26 14:43:15Z

0

Its returning fine, your first element doesn't have an index of 1

ans = depthFirst(state)

# should work fine
print(ans[0])
print(ans[1])
print(ans[2])

arr = ans[0]
explored = arr[1] # arr doesn't have index 1
visited = arr[2]

EDIT: this is assuming you reach the final return statement and not returning early like the other answer suggest.

answered Nov 26, 2021 at 14:43

sin tribu

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