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1. Convert Array to String2. Convert String to Array of Digits3. Count Vowels in Array of Strings4. Find Longest String in Array5. Array of Palindrome Strings6. Sum of Numbers in Array of Strings7. Common Characters in Array of Strings8. Sort Strings by Length9. Count Total Words in Array of Strings10. Concatenate Array of Strings

Common Characters in Array of Strings

Find characters common to all strings.

AdvancedPhase 6 - Category 2: Array & String CombinationsExample 7 of 10
common-characters-in-array-of-strings.py
1# Take array of strings
2n = int(input("Enter number of strings: "))
3arr = []
4for i in range(n):
5    arr.append(input(f"String {i+1}: "))
6

7# Find common characters
8if arr:
9    common = set(arr[0])
10    for s in arr[1:]:
11        common = common & set(s)
12    
13    print(f"Common characters: {sorted(common)}")
14else:
15    print("Array is empty")

Output

Enter number of strings: 3
String 1: hello
String 2: world
String 3: level
Common characters: ['e', 'l']

What's going on

Use set intersection to find common characters.

Key Concepts:

Convert each string to set
Use & operator for intersection
Find common characters

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