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Python - Change List Items

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Change Item Value

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To change the value of a specific item, refer to the index number:

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Example

Change the second item:

thislist = ["apple", "banana", "cherry"]
thislist[1] = "blackcurrant"
print(thislist)
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Change a Range of Item Values

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To change the value of items within a specific range, define a list with the new values, and refer to the range of index numbers where you want to insert the new values:

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Example

Change the values "banana" and "cherry" with the values "blackcurrant" and "watermelon":

thislist = ["apple", "banana", "cherry", "orange", "kiwi", "mango"]
thislist[1:3] = ["blackcurrant", "watermelon"]
print(thislist)
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If you insert more items than you replace, the new items will be inserted where you specified, and the remaining items will move accordingly:

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Example

Change the second value by replacing it with two new values:

thislist = ["apple", "banana", "cherry"]
thislist[1:2] = ["blackcurrant", "watermelon"]
print(thislist)
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Note: The length of the list will change when the number of items inserted does not match the number of items replaced.

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If you insert less items than you replace, the new items will be inserted where you specified, and the remaining items will move accordingly:

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Example

Change the second and third value by replacing it with one value:

thislist = ["apple", "banana", "cherry"]
thislist[1:3] = ["watermelon"]
print(thislist)
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Insert Items

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To insert a new list item, without replacing any of the existing values, we can use the insert() method.

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The insert() method inserts an item at the specified index:

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Example

Insert "watermelon" as the third item:

thislist = ["apple", "banana", "cherry"]
thislist.insert(2, "watermelon")
print(thislist)
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Note: As a result of the example above, the list will now contain 4 items.

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