CODEWITHSUNDEEP
pythonpython-3.xlisttuples
user13747387
user13747387

Reputation:

Changing the value of tuple inside a nested list

How do I change the second value of the first tuple in the first list by force??

test_list=[[(12, 5), (13, 6)], [(12, 2), (13, 2)]]

Please help! Thanks in advance.

Upvotes: 0

Views: 714

Answers (2)

Cireo
Cireo

Reputation: 4427

Tuples are immutable. You would need to replace it instead.

Since lists are mutable, you would replace the first element of the first list with a new tuple having a changed second value.

test_list = [[(12, 5), (13, 6)], [(12, 2), (13, 2)]] 

# test_list - unchanged
# test_list[0] - modified
# test_list[0][0] - replaced
# test_list[0][0][0] - preserved
# test_list[0][0]1] - new
new_second_value = 'foobar'
new_value = (test_list[0][0][0], new_second_value)
test_list[0][0] = new_value

This would give you:

>>> test_list
[[(12, 'foobar'), (13, 6)], [(12, 2), (13, 2)]]

To do it in one line:

test_list[0][0] = (test_list[0][0][0], 'foobar')

Note that if you were using named tuples, you could simplify this slightly with a ._replace() method (https://docs.python.org/2/library/collections.html#collections.somenamedtuple._replace):

test_list[0][0] = test_list[0][0]._replace(foo='bar')

Upvotes: 0

Krunal Sonparate
Krunal Sonparate

Reputation: 1142

Tuples are immutable. You can not change the value of tuple. To update the value you need to create a new tuple with updated value and then you can replace in the array. Tuples in python

Upvotes: 1

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