🚀 Day 58/150 – Find Unique Elements in a List in Python

 

🚀 Day 58/150 – Find Unique Elements in a List in Python

Unique elements are values that appear only once in the list.

Example:
[1, 2, 2, 3, 4, 4, 5] → Unique elements = [1, 3, 5]

Let’s explore different ways to find them 👇

🔹 Method 1 – Using Loop

numbers = [1, 2, 2, 3, 4, 4, 5] unique = [] for num in numbers: if numbers.count(num) == 1: unique.append(num) print("Unique Elements:", unique)

🔹 Method 2 – Using List Comprehension

numbers = [1, 2, 2, 3, 4, 4, 5] unique = [num for num in numbers if numbers.count(num) == 1] print("Unique Elements:", unique)

🔹 Method 3 – Using collections.Counter

from collections import Counter numbers = [1, 2, 2, 3, 4, 4, 5] freq = Counter(numbers) unique = [num for num in numbers if freq[num] == 1] print("Unique Elements:", unique)

🔹 Method 4 – Taking User Input

numbers = list(map(int, input("Enter numbers: ").split())) unique = [num for num in numbers if numbers.count(num) == 1] print("Unique Elements:", unique)

💡 Key Takeaways

• Unique elements appear exactly once
• count() is easy to understand but slower for large lists
• Counter is better for larger datasets
• Useful in data cleaning and duplicate detection