How To Add A Item In A List Of List Using Python

To add an item to a list of lists in Python, you can follow these steps:

Step 1: Understand the Structure

A list of lists is essentially a list where each element is itself a list. For example:

list_of_lists = [[1, 2], [3, 4], [5, 6]]

Step 2: Adding an Item to a Specific Sublist

If you want to add an item to one of the sublists, you can use the append() method.

Example:

Suppose you want to add the number 7 to the first sublist [1, 2]:

list_of_lists[0].append(7)
print(list_of_lists)

Output:

[[1, 2, 7], [3, 4], [5, 6]]

Step 3: Adding a New Sublist

If you want to add an entirely new sublist to the main list:

Example:

Suppose you want to add the sublist [7, 8]:

list_of_lists.append([7, 8])
print(list_of_lists)

Output:

[[1, 2], [3, 4], [5, 6], [7, 8]]

Step 4: Inserting an Item at a Specific Position

If you need to insert an item into a specific position within a sublist or a new sublist at a specific index:

Example:

Inserting 9 at the beginning of the second sublist [3, 4]:

list_of_lists[1].insert(0, 9)
print(list_of_lists)

Output:

[[1, 2], [9, 3, 4], [5, 6]]

Example:

Inserting a new sublist [10, 11] at the second position of the main list:

list_of_lists.insert(1, [10, 11])
print(list_of_lists)

Output:

[[1, 2], [10, 11], [3, 4], [5, 6]]

These are the basic methods to add items to a list of lists in Python.