Modifying A List

Modifying a list in Python

Lists are mutable data types meaning you can change the state of a list after it has been created. Adding items, removing items, or changing items.

1. Modifying a List Item

Changing a List item

indexing

example of modifying a list item

  colors = ["red", "green", "blue"]

  colors[1] = "white"

2. Adding a List item

using append() to add an item

example of adding an item using append()

  # creating an empty list
  colors = []

  # adding an element using append() method
  colors.append("red")

  print(colors) # output: ["red"]

using insert() method

List insert() method takes two arguments:

1. index: An index on which an item should be inserted
2. item: An item to be inserted at that specific position

Note:

Insert an item at that particular index or position, if there’s an element at that position then it pushes that element forward

using a insert() method

  colors = ["red", "orange", "yellow"]

  # will insert green at the index or position of yellow and push it back
  colors.insert(2, "green")

3. Removing a List item

using pop()

pop() removes an item at the last position or index in the list.

using pop() method to remove the last item

  fruits = ["apple", "orange", "grapes"]

  fruits.pop()

using remove()

remove() method removes a given list item from the list.

removing a list item using remove()

  fruits = ["apple", "orange", "grapes"]

  fruits.remove("orange")