In Python, a list of lists is essentially a two-dimensional list where each element of the main list is itself a list. Here’s how to create and work with a list of lists:
1. Using Nested Square Brackets
You can manually create a list of lists by nesting square brackets.
Example:
2. Using a Loop
A loop can be used to create a list of lists dynamically.
Example:
3. Using List Comprehension
List comprehension is a concise way to create a list of lists.
Example:
4. Appending Lists to a Main List
You can append individual lists to create a list of lists.
Example:
5. Creating an Empty List of Lists
To initialize an empty list of lists:
Example:
Accessing Elements in a List of Lists
You can access elements using double indexing.
Example:
Summary
- Manual Creation: Use nested square brackets.
- Dynamic Creation: Use loops or list comprehensions.
- Modification: Append or update individual sublists as needed.
A list of lists is a powerful structure for handling grid-like data or nested information efficiently in Python.
