Replacing elements in a list, Python

Question

How a value in a list can be replaced?

Suppose I have the following list :

mylist=[1,3,5,7,4]

and I just want to change the value at index 3 ( which would be 7) with, let's say, 9. (the change is not conditioned )

For earlier versions of python the replace function would work, but how do I do it in Python 3.6?

@Alex12 on what version of Python did list have a replace method? — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Oct 22, 2017 at 9:40

Thomas Junk · Accepted Answer · 2017-10-22 09:37:07Z

2

Console:

➜ ~ python3
Python 3.6.2 (default, Aug 03 2017, 16:34:42) [GCC] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> mylist=[1,3,5,7,4]
>>> mylist[3]=9
>>> mylist
[1, 3, 5, 9, 4]
>>>

Just like that.

answered Oct 22, 2017 at 9:37

Thomas Junk

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Kaushik NP · Accepted Answer · 2017-10-22 09:42:50Z

2

>>> mylist = [1,3,5,7,4]

1 . The simplest, go to the list index and assign it the new value.

>>> mylist[3] = 9
>>> mylist
=> [1, 3, 5, 9, 4]

2 . Slicing

>>> mylist = mylist[:3] + [9] + mylist[4:]
>>> mylist
=> [1, 3, 5, 9, 4]

answered Oct 22, 2017 at 9:42

Kaushik NP

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1 Comment

Kaushik NP Over a year ago

@Alex12 : Sure. Glad to help

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