Python – Replace vowels by next vowel
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.
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 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)) |
The original string is : geekforgeeks The replaced string : giikfurgiiks
Time Complexity: O(n)
Auxiliary Space: O(n)
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 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)) |
The original string is : geekforgeeks The replaced string : giikfurgiiks
Time Complexity: O(n)
Auxiliary Space: O(n)
Method #3 : Using index() method
Python3
# Python3 code to # Replace vowels by next vowel # initializing string test_str = 'geekforgeeks' # printing original string print ( "The original string is : " + str (test_str)) vow = "aeiou" res = "" for i in test_str: if i in vow: if i = = "u" : res + = "a" else : res + = vow[vow.index(i) + 1 ] else : res + = i # printing result print ( "The replaced string : " + str (res)) |
The original string is : geekforgeeks The replaced string : giikfurgiiks
Time Complexity: O(n)
Auxiliary Space: O(n)
Method #4 : Using translate() method
This method uses the translate() method to replace the vowels in the input string. First, it creates a dictionary using the maketrans() method with the vowels as the keys and the next vowels as the values. Then it uses the translate() method to replace the vowels in the input string with the corresponding next vowels from the dictionary.
Python3
# Python3 code to # Replace vowels by next vowel # initializing string test_str = 'geekforgeeks' # printing original string print ( "The original string is : " + str (test_str)) vow = 'aeiou' vow_dict = str .maketrans( 'aeiou' , 'eioua' ) result = test_str.translate(vow_dict) # printing result print ( "The replaced string : " + str (result)) |
The original string is : geekforgeeks The replaced string : giikfurgiiks
Time Complexity: O(n)
Auxiliary Space: O(n)
Method#5: Without using built-in functions
Python3
test_str = 'geekforgeeks' vowels = 'aeiou' result = '' for char in test_str: if char in vowels: index = vowels.index(char) if index = = len (vowels) - 1 : result + = vowels[ 0 ] else : result + = vowels[index + 1 ] else : result + = char print (result) #This code is contributed by Vinay Pinjala. |
giikfurgiiks
Time Complexity: O(n)
Auxiliary Space: O(n)
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