🚀 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.
🔹 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.
🔹 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.
🔹 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.
🔥 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.
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