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1. Check if Element Exists2. Count Occurrences3. Find First Occurrence4. Find Last Occurrence5. Check Uniqueness6. Sum of Even Elements7. Sum of Odd Elements8. Count Prime Numbers9. Count Divisible by 3 & 510. Count Perfect Squares

Find First Occurrence

Find index of first occurrence of element.

IntermediatePhase 4 - Level 2: Searching & Counting LogicExample 3 of 10
find-first-occurrence.py
1# Take array
2n = int(input("Enter array size: "))
3arr = []
4for i in range(n):
5    arr.append(int(input(f"Element {i+1}: ")))
6

7x = int(input("Enter element to find: "))
8

9# Find first occurrence
10if x in arr:
11    index = arr.index(x)
12    print(f"First occurrence at index: {index}")
13else:
14    print("Element not found")

Output

Enter array size: 5
Element 1: 10
Element 2: 20
Element 3: 30
Element 4: 20
Element 5: 40
Enter element to find: 20
First occurrence at index: 1

What's going on

Use index() method to find first occurrence.

Key Concepts:

index(x) returns first index
Check existence first
Returns index of first match

🔗Related Content

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