Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Multi-dimensional lists in Python
Lists are a very widely use data structure in python. They contain a list of elements separated by comma. But sometimes lists can also contain lists within them. These are called nested lists or multidimensional lists. In this article we will see how to create and access elements in a multidimensional list.
Creating Multi-dimensional list
In the below program we create a multidimensional list of 4 columns and 3 rows using nested for loops.
Example
multlist = [[0 for columns in range(4)] for rows in range(3)] print(multlist)
Output
Running the above code gives us the following result −
[[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]
Extending Multi-dimensional lists
We can add elements to the list created above using methods that are available to the lists. We will use the methods append and extend to achieve this. Both methods are shown in the program below.
Example
multlist = [["Mon","Tue","Wed"], [2, 4, 9,], [1,1.5, 2]] multlist.append(["Phy","Chem","Math"]) print(multlist) multlist[0].extend(["Thu","Fri"]) print(multlist)
Output
Running the above code gives us the following result −
[['Mon', 'Tue', 'Wed'], [2, 4, 9], [1, 1.5, 2], ['Phy', 'Chem', 'Math']] [['Mon', 'Tue', 'Wed', 'Thu', 'Fri'], [2, 4, 9], [1, 1.5, 2], ['Phy', 'Chem', 'Math']]
Accessing Multi-dimensional list
We can access the elements in multidimensional list using for loops as shown in the below program. We design nested for loops to first access the rows and then access the columns.
Example
multlist = [[1,5,9], [2, 4, 9,], [1,1, 2]] for i in range(len(multlist)) : for j in range(len(multlist[i])) : print(multlist[i][j], end=" ") print()
Output
Running the above code gives us the following result −
1 5 9 2 4 9 1 1 2
6K+ Views
