How to create a List of Lists in Python

How to create a List of Lists in Python ?

Answer

To create a list of lists in Python, you can use list comprehension or the `append` method to add lists as elements to create inner lists.

✐ Examples

1 Create List of Lists Using List Comprehension

In this example,

We use list comprehension to create two inner lists named list1 and list2.
We create an outer list named listOfLists and initialize it with the inner lists.
Finally, we print the list of lists to standard output.

Python Program

list1 = [1, 2, 3]
list2 = ['a', 'b', 'c']
listOfLists = [list1, list2]
print('List of lists:', listOfLists)

Output

List of lists: [[1, 2, 3], ['a', 'b', 'c']]

2 Create List of Lists Using append Method

In this example,

We create an empty outer list named listOfListsEmpty.
We create two inner lists named list3 and list4.
We use the append method to add the inner lists list3 and list4 to the outer list listOfListsEmpty.
Finally, we print the list of lists with empty inner lists to standard output.

Python Program

listOfListsEmpty = []
list3 = []
list4 = []
listOfListsEmpty.append(list3)
listOfListsEmpty.append(list4)
print('List of lists with empty inner lists:', listOfListsEmpty)

Output

List of lists with empty inner lists: [[], []]

Summary

In this tutorial, we learned How to create a List of Lists in Python language with well detailed examples.

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How to create a List of Lists in Python

How to create a List of Lists in Python ?

Answer

✐ Examples

1 Create List of Lists Using List Comprehension

Python Program

Output

2 Create List of Lists Using append Method

Python Program

Output

Summary

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