Python List Tutorials
Python Lists
Python List Operations
Create Lists
Python – Create an empty list
Python – Create a list of size n
Python – Create a list of numbers from 1 to n
Python – Create a list of strings
Python – Create a list of objects
Python – Create a list of empty lists
Access Lists
Python List – Access elements
Python List – Get item at specific index
Python List – Get first element
Python List – Get last element
Python List – Iterate with index
Python List – While loop
Python List – For loop
Python List – Loop through items
Python – Unpack List
List Properties
Python – List length
List Methods
Python List Methods
Python List append()
Python List clear()
Python List copy()
Python List count()
Python List extend()
Python List index()
Python List insert()
Python List pop()
Python List remove()
Python List reverse()
Python List sort()
Update / Transform Lists
Python – Add item to list
Python – Remove specific item from list
Python – Remove item at specific index from list
Python – Remove all occurrences of an item from list
Python – Remove duplicates from list
Python – Append a list to another list
Python – Reverse list
Python – Sort list
Python – Sort list in descending order
Python – Shuffle list
Python – Convert list into list of lists
Checking Operations on Lists
Python - Check if list is empty
Python - Check if element is present in list
Python - Check if value is in list using "in" operator
Python - Check if list contains all elements of another list
List Finding Operations
Python – Count the occurrences of items in a List with a specific value
Python – Find duplicates in list
Python – Find unique elements in list
Python – Find index of specific item in list
Python – Insert item at specific position in list
Python – Find element with most occurrences in the list
Python – Find element with least occurrences in the list
List Comprehension Operations
Python List Comprehension
Python List Comprehension with two lists
Python List Comprehension with If condition
Python List Comprehension with multiple conditions
Python List Comprehension with List of Lists
Python List Comprehension with nested For loops

Convert List into a List of Lists

Convert List into List of Lists

To convert a list of elements into a list of lists where the size of outer list is m and the length of each inner list is n, we can use the list comprehension as shown in the following.

[[myListx[i + (m+1)*j] for i in range(n)] for j in range(m) ]

Example

In the following program, we take a list myList with 12 elements, and transform this list into a list of lists where the length of outer list is 3, and the length of each inner list is 4.

Python Program

myList = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]

m = 3
n = 4

output = [[myList[i + (m+1)*j] for i in range(n)] for j in range(m) ]
print(output)

Output

[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]]

Summary

In this Python Examples tutorial, we learned how to convert a given list into two-dimensional list or list of lists of specific size, using List Comprehension.