CODEWITHSUNDEEP
pythonlisttuples
Lexnard
Lexnard

Reputation: 33

Loop over a list of tuples returning just some indexes inside list comprehension

Let's say I have a list of tuples:

myList = [(1,2,3) , (2,3,4) , (3,4,5) ,(4,5,6) , (1,3,5) , (2,4,6)]

I want to iterate over it, but just gonna use the first two indexes of each tuple.

So I'd be actually iterating over:

[(1,2) , (2,3), (3,4), (4,5), (1,3), (2,4)]

I know I can do this:

for item in myList

And then in my code just use item[0], item [1], but I think this will really affect the readbility of my code.

But I have this for in a list comprehension so (I think) I can't store those values in other variable.

My question here is: Would using a dummy variable like:

for (variablename1,variablename2,dummyvar) in myList

be the best way to do that or there is a direct way to return only the first indexes from the for?!

(I accept hints to better clarify the question ;) )

Upvotes: 0

Views: 40

Answers (1)

user2390182
user2390182

Reputation: 73470

Using the anonymouos variable _ is typical in such cases:

for x, y, _ in myList:
    # do stuff with x and y

If the tuples have various lengths, you can do:

for x, y, *_ in myList:
    # do stuff with x and y

to avoid errors.

Upvotes: 3

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