Python – Replace vowels by next vowel

Last Updated : 14 Oct, 2020

Given a String replace each vowel with next vowel in series.

Input : test_str = ‘geekforgeeks’
Output : giikfurgiiks
Explanation : After e, next vowel is i, all e replaced by i.
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Input : test_str = ‘geekforgeeks is best’
Output : giikfurgiiks os bist
Explanation : After e, next vowel is i, all e replaced by i.

Method #1 : Using zip() + list comprehension

This is one of the ways in which this task can be performed. In this we perform the task of forming replace dictionary using zip() and then list comprehension is used to perform the task of replacement with next vowel.

Python3

# Python3 code to demonstrate working of 
# Replace vowels by next vowel
# Using list comprehension + zip()
  
# initializing string
test_str = 'geekforgeeks'
  
# printing original string
print("The original string is : " + str(test_str))
  
# constructing dictionary using zip()
vow = 'a e i o u'.split()
temp = dict(zip(vow, vow[1:] + [vow[0]]))
  
# list comprehension to perform replacement
res = "".join([temp.get(ele, ele) for ele in test_str])
  
# printing result 
print("The replaced string : " + str(res)) 

Output

The original string is : geekforgeeks
The replaced string : giikfurgiiks

Method #2 : Using dictionary comprehension + list comprehension

This is yet another way in which this task can be performed. In this we perform the task of mapping using dictionary comprehension and list comprehension is used to perform task of replacement.

Python3

# Python3 code to demonstrate working of 
# Replace vowels by next vowel
# Using list comprehension + dictionary comprehension
  
# initializing string
test_str = 'geekforgeeks'
  
# printing original string
print("The original string is : " + str(test_str))
  
# constructing dictionary using dictionary comprehension
vow = "aeiou"
temp = {vow[idx] : vow[(idx + 1) % len(vow)] for idx in range(len(vow))}
  
# using get() to map elements to dictionary and join to convert
res = "".join([temp.get(ele, ele) for ele in test_str])
  
# printing result 
print("The replaced string : " + str(res)) 

Output

The original string is : geekforgeeks
The replaced string : giikfurgiiks

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