🚀 Day 71/150 – Find Frequency of Characters in Python

Finding the frequency of characters means counting how many times each character appears in a string. This is a common task in text processing, data analysis, and coding interviews.

✅ Example

text = "hello"
 
Output

{'h': 1, 'e': 1, 'l': 2, 'o': 1}


🔹 Method 1 – Using Dictionary

text = "hello" freq = {} for ch in text: freq[ch] = freq.get(ch, 0) + 1 print(freq)

✅ Output

{'h': 1, 'e': 1, 'l': 2, 'o': 1}
 
📌 Uses a dictionary to store each character and its count.

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🔹 Method 2 – Taking User Input

text = input("Enter a string: ") freq = {} for ch in text: freq[ch] = freq.get(ch, 0) + 1 print(freq)

✅ Example Output

Enter a string: python

{'p': 1, 'y': 1, 't': 1, 'h': 1, 'o': 1, 'n': 1}

📌 Works with any string entered by the user.

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🔹 Method 3 – Using count()

text = "hello" for ch in set(text): print(ch, ":", text.count(ch))

✅ Output

h : 1
e : 1
l : 2
o : 1

📌 Simple approach using Python's built-in count() method.

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🔹 Method 4 – Using Function

def char_frequency(text): freq = {} for ch in text: freq[ch] = freq.get(ch, 0) + 1 return freq print(char_frequency("hello"))

✅ Output

{'h': 1, 'e': 1, 'l': 2, 'o': 1}

📌 Ideal when the same logic needs to be reused multiple times.

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🔥 Key Takeaways

✅ Character frequency counts occurrences of each character.

✅ Dictionaries are the most efficient and commonly used solution.

✅ count() is easy to understand but less efficient for large strings.

✅ Functions make your code reusable and cleaner.

✅ Useful in text analysis, word processing, and interview problems.