Tuples are immutable objects, they cannot be changed says the Python manual.
my_tuple = (1, 2, 3, [4, 5, 6])
# this works
my_tuple[3][2] = 7
# clearly the item at index 3 in the tuple has changed
print(my_tuple) # (1, 2, 3, [4, 5, 7])
Lardmeister
461
Posting Virtuoso
Recommended Answers
Jump to PostLists are passed by reference, so the tuple contains the memory address of the list, not the list itself, and that doesn't change. Both of these statements will fail
my_tuple = (1, 2, 3, [4, 5, 6]) new_list = [4, 5, 6] my_tuple[3] = new_list ## new …
All 4 Replies
predator78
22
Junior Poster
Think about the words though. Did you change the tuple? Or did you change the item at index of?
woooee
814
Nearly a Posting Maven
Lists are passed by reference, so the tuple contains the memory address of the list, not the list itself, and that doesn't change. Both of these statements will fail
my_tuple = (1, 2, 3, [4, 5, 6])
new_list = [4, 5, 6]
my_tuple[3] = new_list ## new memory address
my_tuple[1] = "a"
TrustyTony
888
pyMod
Team Colleague
Featured Poster
You are changing list, not tuple
>>> my_tuple
(1, 2, 3, [4, 5, 6])
>>> type(my_tuple[3])
<class 'list'>
>>> id(my_tuple[3])
14727328
>>> my_tuple[3][2]=7
>>> id(my_tuple[3])
14727328
vegaseat
1,735
DaniWeb's Hypocrite
Team Colleague
Well, you are on to something, the tuple has changed. However, the id() of the whole tuple is still the same after the change.
My advice, don't rely blindly on tuples not changing as advertised.
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