Add tuple values in python

Question

I'm working on a script where I have a list of tuples

tuple=()
number=input("Enter the how many elements you want :")
for i in range(0,number):
     ele=input("Enter the element :")
     tuple.apppend(ele)
print tuple

Append method cannot work

Yes, if you could append arbitrary values to a tuple it wouldn't be a tuple. — Andy G, Dec 28 '17 at 14:51
This is not a list of tuples, it is just a tuple, that you want to fill with strings. — Willem Van Onsem, Dec 28 '17 at 14:51
@kaviraj: yes, it does not makes sense to do that. Lists have order, tuples have structure. — Willem Van Onsem, Dec 28 '17 at 14:55

score 1 · Answer 1 · answered Dec 28 '17 at 14:56

1

You can solve it by creating your tuple-inputs from a list like so:

def GetTuple():
    data=[]
    number=input("Enter the how many elements you want :")
    for i in range(0,number):
        ele=input("Enter the element :")
        data.append(ele)

    return tuple(data)


myTup = GetTuple()
print(myTup)

If you need multiple tuples you have to call this multiple times and put each tumple inside another list. After the tuple is created, you cannot modify it.

answered Dec 28 '17 at 14:56

Patrick Artner

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@kaviraj Exactly, that is the reason to collect all values stored inside that tuple into a list and converting that into a tumple at the end. The resulting tuple is immutable. If you need to mutate the values of your tuples, then you should not use them but use lists instead. – Patrick Artner Dec 28 '17 at 15:04

Mr. Xcoder · Answer 2 · 2017-12-28T15:08:33.457

1

Tuples are immutable, meaning that their value cannot be changed where they're stored in memory, but rather pointing the variable to a different instance in memory.

Therefore, it does not make sense to have an append() method for an immutable type. This method is designed specifically for lists.

In your case, you might want to switch to a list rather than a tuple.

edited Dec 28 '17 at 15:08

answered Dec 28 '17 at 15:02

Mr. Xcoder

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score 0 · Answer 3 · answered Dec 28 '17 at 15:20

Append method cannot work

Exactly. Tuples are immutable. So provide all contents during creation. Like:

elements = tuple(input('Enter the element: ') for _ in range(number))

Demo:

>>> number = input('Enter the how many elements you want: ')
Enter the how many elements you want: 3
>>> elements = tuple(input('Enter the element: ') for _ in range(number))
Enter the element: 3.142
Enter the element: 2.718
Enter the element: 42
>>> elements
(3.142, 2.718, 42)

score 0 · Answer 4 · edited Apr 06 '18 at 16:41

0

tuple=()
number=int(input("Enter the how many elements you want :"))
for i in range(number):
    ele=input("Enter the element :")
    tuple = tuple + (int(ele),)
print(tuple)

This works on Python 3.6.

edited Apr 06 '18 at 16:41

totallyhuman

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answered Dec 28 '17 at 15:25

Alex Vask

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please give more explanation for your solution – Ahmad Al-Kurdi Dec 28 '17 at 15:32
It works everywhere. But it creates a new tuple everytime instead of adding elements into existing one (what is impossible by definition). – Axalix Dec 28 '17 at 16:12

Stefan Pochmann · Answer 5 · 2017-12-28T15:40:49.837

Instead of tuple.append(ele) you could do tuple += ele,^[*]. It's less efficient because it copies the whole tuple every time, but since you apparently have a person enter data manually, I assume it won't be much.

Btw, don't call it tuple. You're shadowing Python's built-in, plus you'd better use a meaningful name that describes the contents.

^{[*] To the inevitable noobs ignoring the comma and claiming that that doesn't work: Don't ignore the comma, and do test it.}

Add tuple values in python

5 Answers5