Changing values in a tuple

Question

I have a list of tuples:

tup = [('a', '10', 0xA), ('b', '9', 0x9)]

I am trying to change the values of the 3rd element in it

My attempt:

for i, elements in enumerate(tup):
    elements = list(elements)
    elements[2] = 0x99

When I check the contents of the tuple, it does not update with new my value.

Input: [i for i in tup] Output: [('a', '10', 10), ('b', '9', 9)]

Clearly a significant misunderstanding of how these data structures work on my part.

Any help appreciated.

Cheers

I know tuples are immutable(!), but I access them by temporarily changing them to a list.... — arsenal88, Apr 09 '18 at 13:25

score 2 · Accepted Answer · answered Apr 09 '18 at 13:26

2

Convert it to a list and update the values. And the you can change it back to tuple.

Ex:

tup = [('a', '10', 0xA), ('b', '9', 0x9)]
res = []
for i in tup:
    val = list(i)
    val[-1] = 0x99
    res.append(tuple(val))

print(res)

answered Apr 09 '18 at 13:26

Rakesh

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score -1 · Answer 2 · answered Apr 09 '18 at 13:24

That is not possible:

>>> t = (1,2,3)
>>> t[0]
1
>>> t[0] = 4
Traceback (most recent call last):
  File "<input>", line 1, in <module>
    t[0] = 4
TypeError: 'tuple' object does not support item assignment

Changing values in a tuple

2 Answers2