Flash cards
Review the key moves
What is the main idea behind Python - Change List Items?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
___ = ["apple", "banana", "cherry"]Put the learning moves in the order that makes the concept easiest to apply.
Change Item Value
To change the value of a specific item, refer to the index number:
Example
thislist = ["apple", "banana", "cherry"]
thislist[1] = "blackcurrant"
print(thislist)Change a Range of Item Values
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:
Example
thislist = ["apple", "banana", "cherry", "orange", "kiwi", "mango"]
thislist[1:3] = ["blackcurrant", "watermelon"]
print(thislist)If you insert more items than you replace, the new items will be inserted where you specified, and the remaining items will move accordingly:
Example
thislist = ["apple", "banana", "cherry"]
thislist[1:2] = ["blackcurrant",
"watermelon"]
print(thislist)Note
The length of the list will change when the number of items inserted does not match the number of items replaced.
If you insert less items than you replace, the new items will be inserted where you specified, and the remaining items will move accordingly:
Example
thislist = ["apple", "banana", "cherry"]
thislist[1:3] = ["watermelon"]
print(thislist)Insert Items
To insert a new list item, without replacing any of the existing values, we can use the insert() method.
The insert() method inserts an item at the specified index:
Example
thislist = ["apple", "banana", "cherry"]
thislist.insert(2, "watermelon")
print(thislist)Note
As a result of the example above, the list will now contain 4 items.