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
Lambda expression in Python Program to rearrange positive and negative numbers
In this tutorial, we are going to write an anonymous function using lambda to rearrange positive and negative number in a list. We need the pick the negative numbers and then positive numbers from a list to create a new one.
Algorithm
Let's see how to solve the problem step by step.
1. Initialize a list with negative and positive numbers. 2. Write a lambda expression the takes a list as an argument. 2.1. Iterate over the list and get negative numbers 2.2. Same for positive numbers 2.3. Combine both using concatination operator. 3. Return the resultant list.
Note - Use the list comprehension to get negative and positive numbers.
Example
See the code below if you stuck at any point.
# initializing a list arr = [3, 4, -2, -10, 23, 20, -44, 1, -23] # lambda expression rearrange_numbers = lambda arr: [x for x in arr if x < 0] + [x for x in arr if x >= 0] # rearranging the arr new_arr = rearrange_numbers(arr) # printing the resultant array print(new_arr)
Output
If you execute the above program, then you will get the following output.
[-2, -10, -44, -23, 3, 4, 23, 20, 1]
Conclusion
Lambda functions are great for a small operation that need to be perform many times in a program. If you have any doubts regarding the tutorial, mention them in the comment section.
Updated on: 24-Apr-2020
509 Views
Advertisements