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1. Reverse a String2. Check Palindrome String3. Count Vowels in String4. Count Consonants in String5. Count Digits in String6. Remove Special Characters7. Remove Whitespace8. Find Substring9. Replace Substring10. Character Frequency11. Capitalize First Letter of Each Word12. Convert String to Title Case13. Sort String Characters14. Find Longest Word15. Find Shortest Word16. String Compression17. String Rotation18. Anagram Check19. Split and Join Strings20. Count Words in String21. Extract Numbers from String22. Validate Email Using Regex23. Validate Phone Number Using Regex24. Check Pangram25. Convert snake_case to camelCase

Character Frequency in Python

Count the frequency of each character in a string.

BeginnerString ProgramsExample 10 of 25
character-frequency.py
1# Program to count frequency of each character in a string
2

3s = input("Enter a string: ")
4

5freq = {}
6for ch in s:
7    freq[ch] = freq.get(ch, 0) + 1
8

9for ch, count in freq.items():
10    print(f"{ch!r}: {count}")

Output

Enter a string: aba
'a': 2
'b': 1

What's going on

We build a dictionary mapping each character to the number of times it appears using dict.get().

After this program

If the idea is still fuzzy, read Day 4: Strings and String Methods in the Python course. For a short check, try the Python quiz (300 questions). Stay with all 25 string programs, or see every topic on Python exercises.

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