🚀 Day 57/150 – Find Common Elements in Lists in Python

 

🚀 Day 57/150 – Find Common Elements in Lists in Python

Finding common elements means identifying values that appear in both lists.

This is useful in filtering, comparisons, and matching datasets.

🔹 Method 1 – Using Loop

list1 = [1, 2, 3, 4, 5] list2 = [3, 4, 5, 6, 7] common = [] for num in list1: if num in list2: common.append(num) print("Common Elements:", common)

🔹 Method 2 – Using List Comprehension

list1 = [1, 2, 3, 4, 5] list2 = [3, 4, 5, 6, 7] common = [num for num in list1 if num in list2] print("Common Elements:", common)

🔹 Method 3 – Using set()

list1 = [1, 2, 3, 4, 5]
list2 = [3, 4, 5, 6, 7]

common = list(set(list1) & set(list2))

print("Common Elements:", common)

🔹 Method 4 – Taking User Input

list1 = list(map(int, input("Enter first list: ").split()))



list2 = list(map(int, input("Enter second list: ").split()))

common = [num for num in list1 if num in list2]

print("Common Elements:", common)

💡 Key Takeaways

• Loop method is easiest to understand
• List comprehension gives a shorter solution
• set() is faster for large lists
• Useful in comparisons, filtering, and duplicate checking