How do I answer this basic Python question?

Question

1.00/5 (1 vote)

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Define and implement a function that accepts a tuple of lists and returns the sum of only the unique numbers in that tuple.

For example, if the user enters the following tuple: ([1, 5], [7, 8, 3, 2], [3, 3, 2]) then the output should be 26

What I have tried:

I have tried a couple things but nothing seems to be working. I know this is a very basic question but I am very new to Python. I'd appreciate your answer. Many thanks

Posted 13-Mar-22 11:10am

BeginnerCoder1

Updated 13-Mar-22 21:51pm

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Maciej Los 13-Mar-22 17:22pm

How 1+5+7+8 can be equal to 26?

2 solutions

Solution 1

I'd do that this way:
1) create dictionary object and count the number of occurencies of specific number in the entire tuple,
2) create list of numbers which occurence is equal to 1
3) get sum of numbers (step 2)

It's pretty easy.

More info at: 5. Data Structures — Python 3.10.2 documentation[^]

Posted 13-Mar-22 11:27am

Maciej Los

Updated 13-Mar-22 11:30am

v2

Comments

BeginnerCoder1 13-Mar-22 20:45pm

Hey thankyou so much for your answer. Actually I'm looking for the exact coding of this, would you be kind enough to write the code please?

Dave Kreskowiak 13-Mar-22 21:24pm

That's your assignment, not ours.

If you don't write the code, you learn nothing.

BeginnerCoder1 13-Mar-22 21:26pm

Well said Dave. But if you don't want to answer just ignore the message why bother leaving a comment like this.

CPallini 14-Mar-22 3:45am

5.

Maciej Los 14-Mar-22 5:38am

Thank you, Carlo.

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CPallini · Accepted Answer · 2022-03-13T21:51:00

Solution 2

You ca do it with a one-liner. Try

Python

tin = ([1, 5], [7, 8, 3, 2], [3, 3, 2]) # the input data
print(sum ({x for l in tin for x in l})) # the one-liner solution

Explanation: a set comprehension is used to extract all the unique numbers of tin into a set (because sets don't store duplicate values). Eventually all the set items are summed up using the sum function.

Posted 13-Mar-22 21:51pm

CPallini

Comments

Richard MacCutchan 14-Mar-22 4:24am

+5; very cool.

CPallini 14-Mar-22 4:29am

Thank you!

Maciej Los 14-Mar-22 5:39am

5ed!

CPallini 15-Mar-22 2:56am

Thank you!

BeginnerCoder1 14-Mar-22 18:55pm

@CPallini THANK YOU

CPallini 15-Mar-22 2:56am

You are welcome.