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A list of lists in Python is a list where each element is itself a list. This structure is often used to represent matrices or nested collections of elements. Each inner list can have different lengths, allowing for irregular or jagged structures1.
Creating a List of Lists
There are several ways to create a list of lists in Python:
Using List Initializer
You can directly initialize a list of lists using square brackets:
list_of_lists = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]print(list_of_lists)Output:
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]Using append() Method
You can create an empty list and append lists to it:
list_of_lists = []list_of_lists.append([1, 2, 3])list_of_lists.append([4, 5, 6])list_of_lists.append([7, 8, 9])print(list_of_lists)Output:
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]Using List Comprehension
List comprehension provides a concise way to create a list of lists:
list_of_lists = [[i for i in range(1, 4)] for _ in range(3)]print(list_of_lists)Output:
[[1, 2, 3], [1, 2, 3], [1, 2, 3]]Using For-Loop
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