Python: Remove duplicates from a list of integers, preserving order
Python Programming Puzzles: Exercise-54 with Solution
Write a Python program to remove duplicates from a list of integers, preserving order.
Input: [1, 3, 4, 10, 4, 1, 43] Output: [1, 3, 4, 10, 43] Input: [10, 11, 13, 23, 11, 25, 23, 76, 99] Output: [10, 11, 13, 23, 25, 76, 99]
Pictorial Presentation:

Sample Solution-1:
Python Code:
#License: https://bit.ly/3oLErEI
def test(nums):
return list(dict.fromkeys(nums))
nums = [1, 3, 4, 10, 4, 1, 43]
print("Original list of numbers:")
print(nums)
print("Remove duplicates from the said list of integers, preserving order:")
print(test(nums))
nums = [10, 11, 13, 23, 11, 25, 23, 76, 99]
print("\nOriginal list of numbers:")
print(nums)
print("Remove duplicates from the said list of integers, preserving order:")
print(test(nums))
Sample Output:
Original list of numbers: [1, 3, 4, 10, 4, 1, 43] Remove duplicates from the said list of integers, preserving order: [1, 3, 4, 10, 43] Original list of numbers: [10, 11, 13, 23, 11, 25, 23, 76, 99] Remove duplicates from the said list of integers, preserving order: [10, 11, 13, 23, 25, 76, 99]
Flowchart:

Sample Solution-2:
Python Code:
#License: https://bit.ly/3oLErEI
def test(nums):
result = []
for x in nums:
if x not in result:
result.append(x)
return result
nums = [1, 3, 4, 10, 4, 1, 43]
print("Original list of numbers:")
print(nums)
print("Remove duplicates from the said list of integers, preserving order:")
print(test(nums))
nums = [10, 11, 13, 23, 11, 25, 23, 76, 99]
print("\nOriginal list of numbers:")
print(nums)
print("Remove duplicates from the said list of integers, preserving order:")
print(test(nums))
Sample Output:
Original list of numbers: [1, 3, 4, 10, 4, 1, 43] Remove duplicates from the said list of integers, preserving order: [1, 3, 4, 10, 43] Original list of numbers: [10, 11, 13, 23, 11, 25, 23, 76, 99] Remove duplicates from the said list of integers, preserving order: [10, 11, 13, 23, 25, 76, 99]
Flowchart:

Python Code Editor :
Have another way to solve this solution? Contribute your code (and comments) through Disqus.
Previous: Find the product of the units digits in the numbers.
Next: Find the numbers that are greater than 10 and have odd first and last digits.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
- Weekly Trends
- Python Interview Questions and Answers: Comprehensive Guide
- Scala Exercises, Practice, Solution
- Kotlin Exercises practice with solution
- MongoDB Exercises, Practice, Solution
- SQL Exercises, Practice, Solution - JOINS
- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join