Python | Multiplying Selective Values

Let's explore multiplying selective values in a list using Python.

Problem Statement:

Given a list of numbers, multiply only those values that meet a certain condition.

For example, let's say we want to multiply all even numbers by 2.

Input:

[1, 2, 3, 4, 5, 6] 

Output:

[1, 4, 3, 8, 5, 12] 

Solution 1: Traditional Looping

Using a simple for loop, we can iterate over each element and multiply it if it meets our condition.

def multiply_selective(lst, factor=2): result = [] for val in lst: if val % 2 == 0: # If the value is even result.append(val * factor) else: result.append(val) return result numbers = [1, 2, 3, 4, 5, 6] print(multiply_selective(numbers)) 

Solution 2: List Comprehension

Using list comprehensions, the solution can be more concise.

def multiply_selective(lst, factor=2): return [val * factor if val % 2 == 0 else val for val in lst] numbers = [1, 2, 3, 4, 5, 6] print(multiply_selective(numbers)) 

Solution 3: Using map()

The map() function applies a function to all items in an input list.

def selective_multiplier(val, factor=2): return val * factor if val % 2 == 0 else val numbers = [1, 2, 3, 4, 5, 6] print(list(map(selective_multiplier, numbers))) 

Custom Conditions:

The beauty of these approaches is that they're easily adaptable to custom conditions. For example, if you want to multiply numbers greater than 4 by 3, simply change the condition in the function.

Using list comprehension:

def multiply_selective(lst, factor=3): return [val * factor if val > 4 else val for val in lst] numbers = [1, 2, 3, 4, 5, 6] print(multiply_selective(numbers)) 

Conclusion:

Python offers multiple ways to multiply selective values in a list based on a given condition. Depending on your preferences and specific requirements, you can use traditional loops, list comprehensions, or functions like map() to achieve the desired result.

---

More Tags

android-paging-library has-many editor client-server fluentftp countdowntimer mappedsuperclass subnet webforms http-get

More Programming Guides

• Inner Join Vs Outer Join
• Cryptography GUI using python in Tkinter
• PostgreSQL - Data Types
• SQL | TRANSACTIONS
• How to randomize a linked list in C#
• Python try-except-else
• MySQL INT, TINYINT, SMALLINT, MEDIUMINT, BIGINT (integer types)
• Python open() function: open the specified file

Other Guides

• What is difference between sleep() method and yield() method of multi threading in java?
• Python, Determine if a string should be converted into Int or Float
• Multiple AppSettings files in Visual Studio, is it possible?
• Django csrf token + Angularjs
• Dependency injection using Azure WebJobs SDK?

More Programming Examples

• regex - how to remove quoted words/phrases from a string using python?
• Retrieving values using WHERE Clause in SQLite Database table using android
• sql - formating a phone number in the postresql query
• python - How to deal with certificates using Selenium?
• asp.net mvc - Rotativa ViewAsPDF CSS Sizing / Dimensions
• Can jQuery add commas while user typing numbers?