Python - Replace vowels by next vowel

Python - Replace vowels by next vowel

In this tutorial, we will explore how to replace each vowel in a given string with the next vowel in the sequence aeiou. The replacement process will be circular, meaning that the vowel after 'u' would be 'a'.

Objective:

Given a string s, replace each vowel in s with the next vowel in the sequence.

Sample Input:

s = "apple"

Expected Output:

"epple"

Tutorial:

Step 1: Define a mapping that represents the next vowel for each vowel.

vowel_mapping = { 'a': 'e', 'e': 'i', 'i': 'o', 'o': 'u', 'u': 'a' }

Step 2: Iterate over each character in the string.

Step 3: If the character is a vowel (i.e., it exists in the vowel_mapping dictionary), replace it with the corresponding value from the dictionary. Otherwise, keep the character as it is.

Here's a function to achieve this:

def replace_vowels_with_next(s): vowel_mapping = { 'a': 'e', 'e': 'i', 'i': 'o', 'o': 'u', 'u': 'a' } return ''.join(vowel_mapping[char] if char in vowel_mapping else char for char in s)

Step 4: Test the function using the sample input.

s = "apple" print(replace_vowels_with_next(s)) # Output: "epple"

Additional Points:

  1. Case Sensitivity: The provided solution works for lowercase vowels. If the input string can contain uppercase vowels and you want them to be replaced as well, adjust the vowel_mapping dictionary to include uppercase vowels and their replacements.

  2. Circular Replacement: The replacement is circular, meaning 'u' gets replaced by 'a' as defined in the mapping.

Recap:

In this tutorial, we've learned how to replace each vowel in a string with the next vowel in the sequence aeiou using a mapping dictionary. This approach can be expanded to other character replacement scenarios by adjusting the mapping.

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