Python Exercises: Hash elements

Last update on April 19 2025 13:04:51 (UTC/GMT +8 hours)

Add hashes around non-vowels.

Write a Python program that takes a string and returns # on both sides of each element, which are not vowels.

Sample Data:
("Green" -> "-G--r-ee-n-"
("White") -> "-W--h-i-t-e"
(“aeiou") -> "aeiou"

Sample Solution-1:

Python Code:

# Define a function to insert hash elements on both sides of each element,
# which are not vowels, in the input string
def test(text):
    # Use a list comprehension to create a list of modified elements
    return "".join([el, '-' + el + '-'][el not in "AEIOUaeiou"] for el in text)

# Initialize a string
text = "Green"

# Print the original string
print("Original string:", text)

# Print a message indicating the insertion of hash elements
print("Insert Hash elements on both sides of each element, which are not vowels:")

# Call the function to modify the string and print the result
print(test(text))

# Repeat the process with a different string
text = "White"

# Print the original string
print("\nOriginal string:", text)

# Print a message indicating the insertion of hash elements
print("Insert Hash elements on both sides of each element, which are not vowels:")

# Call the function to modify the string and print the result
print(test(text))

# Repeat the process with a string containing only vowels
text = "aeiou"

# Print the original string
print("\nOriginal string:", text)

# Print a message indicating the insertion of hash elements
print("Insert Hash elements on both sides of each element, which are not vowels:")

# Call the function to modify the string and print the result
print(test(text))

Sample Output:

Original string: Green
Insert Hash elements on both side of each element, which are not vowels:
-G--r-ee-n-

Original string: White
Insert Hash elements on both side of each element, which are not vowels:
-W--h-i-t-e

Original string: aeiou
Insert Hash elements on both side of each element, which are not vowels:
aeiou

Flowchart:

Sample Solution-2:

Python Code:

# Define a function to insert hash elements on both sides of each element in the input string
# if the element is not a vowel, and return the modified string
def test(text):
    # Use a generator expression and join to create the modified string
    return ''.join('-{}-'.format(el) if el.lower() not in 'aeiou' else el for el in text)

# Initialize a string
text = "Green"

# Print the original string
print("Original string:", text)

# Print a message indicating the insertion of hash elements
print("Insert Hash elements on both sides of each element, which are not vowels:")

# Call the function to modify the string and print the result
print(test(text))

# Repeat the process with a different string
text = "White"

# Print the original string
print("\nOriginal string:", text)

# Print a message indicating the insertion of hash elements
print("Insert Hash elements on both sides of each element, which are not vowels:")

# Call the function to modify the string and print the result
print(test(text))

# Repeat the process with a string containing only vowels
text = "aeiou"

# Print the original string
print("\nOriginal string:", text)

# Print a message indicating the insertion of hash elements
print("Insert Hash elements on both sides of each element, which are not vowels:")

# Call the function to modify the string and print the result
print(test(text))

Sample Output:

Original string: Green
Insert Hash elements on both side of each element, which are not vowels:
-G--r-ee-n-

Original string: White
Insert Hash elements on both side of each element, which are not vowels:
-W--h-i-t-e

Original string: aeiou
Insert Hash elements on both side of each element, which are not vowels:
aeiou

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to iterate over a string and wrap non-vowel characters with '#' while leaving vowels unchanged.
Write a Python program to use a loop and conditional checks to add '#' on both sides of each non-vowel in a string.
Write a Python program to implement this transformation using list comprehension to surround consonants with hash characters.
Write a Python program to replace each non-vowel character with a formatted string that includes '#' before and after the character.

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