Change List items in python |
In Python, lists are mutable, which means their elements can be changed, updated, or replaced after the list has been created. This feature makes lists very flexible and powerful for storing and modifying collections of data. You can change list items by referring to their index number, because every element in a list has a unique position starting from index 0 for the first item.
For example:
my_list = ["apple", "banana", "cherry"]
my_list[1] = "mango"
print(my_list)
Output:
['apple', 'mango', 'cherry']
In the above example, the item "banana" at index 1 is replaced with "mango". This shows how easily list elements can be modified. You can also change multiple items at once by using slicing.
Example:
numbers = [10, 20, 30, 40, 50]
numbers[1:4] = [25, 35, 45]
print(numbers)
Output:
[10, 25, 35, 45, 50]
Here, the slice [1:4] means we are changing the items from index 1 to 3. Python allows the replacement of a section of the list with a new sequence of any length — it can even be longer or shorter than the original.
You can also insert new items while changing the list by assigning values to an empty slice:
fruits = ["apple", "cherry"]
fruits[1:1] = ["banana"]
print(fruits)
Output:
['apple', 'banana', 'cherry']
This feature makes it possible to dynamically modify lists during program execution. In summary, changing list items in Python provides great flexibility and helps developers easily update, replace, or insert data into an existing list structure.
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