How to check if a tuple contains an element in Python?

Question

I tried to find the available methods but couldn't find it. There is no contains. Should I use index? I just want to know if the item exists, don't need the index of it.

Solution 1

You use in.

if element in thetuple:
    #whatever you want to do.

Solution 2

if "word" in str(tuple):
# You can convert the tuple to str too

i has the same problem and only worked to me after the convert str()

Comments

[Joan Venge]

Thanks, for multiple elements should I do if a in tuple and b in tuple: ?

[Lennart Regebro]

Yes. If you have a lot of elements you might consider using sets instead, where you can do union, difference and intersection operations.

[Joan Venge]

Thanks, actually the API I am using is returning a tuple, that's why I was using that. Should I convert it to a set?

[Lennart Regebro]

@JoanVenge: If you want it to be a set, yes.

[Joan Venge]

Thanks will do. I just didn't want to change the data types too much because it's gonna get called 10000s of times every frame.

[Lennart Regebro]

@JoanVenge: Yes, making a set of a tuple is a heavy operation, so doing that 10.0000 times is generally not desirable. You have a specific situation and a specific problem, but you ask very generic questions. The answers you get will not be very useful.

[Joan Venge]

Ok thanks, I will just use in twice because it's only 2 checks. I just didn't want to make it very messy.

[Lennart Regebro]

Then using a set is not useful.

[Danilo]

Hi new contributor. Your answer was similar as accepted answer, but you should know that keyword in is same as __contains__ overloaded operator on class. So when original poster said that there was no __contains__ he/she meant that it wasn't possible to use in keyword on data set. As you can see string class has that operator implemented so your answer is ok. Keep going! :D

[magusvox]

its true, i was not seen the specification in the question. I was looking to solve my problem (a 'str' situation) and I found that the question wasnt about it only after the answer haha

[YEp d]

tuples are only created in python if you use the notation (element,). The comma is very important. If there is no comma, python treats it like an expression to evaluate.