CODEWITHSUNDEEP
pythonpython-3.x
Saurabh
Saurabh

Reputation: 199

How to iterate over multiple dictionaries within a for loop?

I have two dictionaries named 'I' and 'J' and I want to iterate it over a for loop and get the value of a variable which is function of both 'I' and 'J'.

I={0,10,20,30,40,50,60,70,80,90,100,110,120,130,140,150}
J={-50,-40,-30,-20,-10,0,10,20,30,40}

F=[[0 for j in J] for i in I]


for i in I:
    for j in J:
        if i+j==100:
            F[i][j]=-j*2.782490319
        else:
            F[i][j]="NA"

print(F[60][40])

I want the value in the print command to be taken from dictionary 'I' & 'J'. For example in above code I have written print(F[60][40]), so the 60 can be any value from dictionary 'I' and 40 can be any value from dictionary 'J'.

I was expecting the answer for above code to be "-111.29961276" but instead I am getting an error "IndexError: list index out of range". I would be more than happy if somebody could answer the query. TIA :)

Upvotes: 1

Views: 65

Answers (1)

Adam.Er8
Adam.Er8

Reputation: 13413

as mentioned, I and J are sets, but the problem is that F is a list.

try this:

I={0,10,20,30,40,50,60,70,80,90,100,110,120,130,140,150}
J={-50,-40,-30,-20,-10,0,10,20,30,40}

F={(i,j):0 for j in J for i in I}


for i in I:
    for j in J:
        if i+j==100:
            F[(i,j)]=-j*2.782490319
        else:
            F[(i,j)]="NA"

print(F[(60,40)])

I changed F to be a dictionary with keys of type (int, int), and that's it...

Output:

-111.29961276

Upvotes: 3

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