🚀 Day 25/150 – Check Alphabet, Digit, or Special Character in Python

 

🚀 Day 25/150 – Check Alphabet, Digit, or Special Character in Python

This is a very practical problem that helps you understand character classification in Python. It’s commonly used in input validation, password checking, and text processing.

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📌 Goal

Given a character, determine whether it is:

• 🔤 Alphabet (A–Z, a–z)
• 🔢 Digit (0–9)
• ⚡ Special Character (anything else like @, #, $, etc.)

🔹 Method 1 – Using if-elif-else

char = 'A'

if char.isalpha():
    print("Alphabet")
elif char.isdigit():
    print("Digit")
else:
    print("Special Character")

🧠 Explanation:

• isalpha() → checks if character is a letter
• isdigit() → checks if it’s a number
• Anything else → special character

👉 Best for: Clean and beginner-friendly logic

🔹 Method 2 – Taking User Input

char = input("Enter a character: ") if char.isalpha(): print("Alphabet") elif char.isdigit(): print("Digit") else: print("Special Character")

🧠 Explanation:

• Makes program interactive
• Works for real-time inputs

👉 Best for: Practical use

🔹 Method 3 – Using Function

def check_char(c):
    if c.isalpha():
        return "Alphabet"
    elif c.isdigit():
        return "Digit"
    else:
        return "Special Character"

print(check_char('@'))

🧠 Explanation:

• Function makes code reusable
• Returns result instead of printing

👉 Best for: Modular code

🔹 Method 4 – Using Lambda Function

check = lambda c: "Alphabet" if c.isalpha() else "Digit" if c.isdigit() else "Special Character"

print(check('5'))

🧠 Explanation:

• One-line compact logic
• Uses nested conditional expressions

👉 Best for: Short expressions

⚡ Key Takeaways

• isalpha() → Alphabet
• isdigit() → Digit
• Else → Special Character
• Always validate input length

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💡 Pro Tip

Try extending this:

• Count alphabets, digits, and symbols in a string
• Build a password strength checker
• Analyze text data