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Remove All Non-Alphabetic Characters from a String

Certification: Basic Level Accuracy: 66.2% Submissions: 71 Points: 5

Write a Python program that removes all non-alphabetic characters from a given string, leaving only letters.

Example 1
    

  • Input: string = "Hello, World! 123"
    • 

  • Output: "HelloWorld"
    • 

  • Explanation: 
      

    • Step 1: Iterate through each character in the string.
      • 

    • Step 2: Keep only alphabetical characters (a-z, A-Z).
      • 

    • Step 3: Remove all other characters (punctuation, numbers, spaces).
      • 

    • Step 4: Return the resulting string with only letters.
      • 

    •
Example 2
    

  • Input: string = "Python3.9_is@awesome"
    • 

  • Output: "Pythonisawesome"
    • 

  • Explanation: 
      

    • Step 1: Iterate through each character in the string.
      • 

    • Step 2: Keep only alphabetical characters (a-z, A-Z).
      • 

    • Step 3: Remove all other characters (numbers, dots, underscores, at symbols).
      • 

    • Step 4: Return the resulting string with only letters.
      • 

    •
Constraints
    

  • 0 ≤ len(string) ≤ 10^6
    • 

  • String may contain any printable ASCII characters
    • 

  • Time Complexity: O(n) where n is the length of the input string
    • 

  • Space Complexity: O(n) for storing the result
    •
StringsControl StructuresFunctions / MethodsWiproAdobe
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Hint
Solution

Solution Hints

    
  
  • Use string methods: ''.join(char for char in s if char.isalpha())
    • 
  
  • Use regular expressions: re.sub(r'[^a-zA-Z]', '', s)
    • 
  
  • Filter characters using a loop and check if each character is alphabetic
    •

Steps to solve by this approach:

 Step 1: Initialize an empty string to store the result.

 Step 2: Iterate through each character in the input string.

 Step 3: Check if the current character is alphabetic using isalpha() method.

 Step 4: If the character is alphabetic, add it to the result string.

 Step 5: Skip non-alphabetic characters (punctuation, numbers, spaces).

 Step 6: Return the final string containing only alphabetic characters.

Submitted Code :