Handling Strings

Strings are a fundamental data type in Python. They allow us to work with textual data and provide a wide range of operations and methods to manipulate and analyze text. This page includes beginner-friendly exercises on string handling, combining logic building using loops and conditions, as well as string functions.

Practice Problems

Problems Index

Input a string and count the number of vowels in it.
Input a string and reverse it using a loop.
Input a string and check if it is a palindrome.
Input two strings and check if they are anagrams.
Input a string and remove all spaces from it.
Input a string and find the frequency of each character.
Input a sentence and count the number of words.
Input a string and convert it to uppercase without using str.upper().
Input a string and print each character along with its ASCII value.
Input a string and replace all vowels with *.

Try It Yourself

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Output:

Solutions

Input a string and count the number of vowels in it.

Show Code

string = input("Enter a string: ")
vowels = "aeiouAEIOU"
count = 0
for char in string:
    if char in vowels:
        count += 1
print("Number of vowels:", count)

Input a string and reverse it using a loop.

Show Code

string = input("Enter a string: ")
reversed_string = ""
for char in string:
    reversed_string = char + reversed_string
print("Reversed string:", reversed_string)

Input a string and check if it is a palindrome.

Show Code

string = input("Enter a string: ")
is_palindrome = True
for i in range(len(string) // 2):
    if string[i] != string[-(i + 1)]:
        is_palindrome = False
        break
if is_palindrome:
    print("The string is a palindrome.")
else:
    print("The string is not a palindrome.")

Input two strings and check if they are anagrams.

Show Code

str1 = input("Enter the first string: ")
str2 = input("Enter the second string: ")
if sorted(str1) == sorted(str2):
    print("The strings are anagrams.")
else:
    print("The strings are not anagrams.")

Input a string and remove all spaces from it.

Show Code

string = input("Enter a string: ")
result = ""
for char in string:
    if char != " ":
        result += char
print("String without spaces:", result)

Input a string and find the frequency of each character.

Show Code

string = input("Enter a string: ")
frequency = {}
for char in string:
    if char in frequency:
        frequency[char] += 1
    else:
        frequency[char] = 1
print("Character frequencies:", frequency)

Input a sentence and count the number of words.

Show Code

sentence = input("Enter a sentence: ")
word_count = 1
for char in sentence:
    if char == " ":
        word_count += 1
print("Number of words:", word_count)

Input a string and convert it to uppercase without using str.upper().

Show Code

string = input("Enter a string: ")
uppercase_string = ""
for char in string:
    if 'a' <= char <= 'z':
        uppercase_string += chr(ord(char) - 32)
    else:
        uppercase_string += char
print("Uppercase string:", uppercase_string)

Input a string and print each character along with its ASCII value.

Show Code

string = input("Enter a string: ")
for char in string:
    print(f"Character: {char}, ASCII value: {ord(char)}")

Input a string and replace all vowels with *.

Show Code

string = input("Enter a string: ")
vowels = "aeiouAEIOU"
result = ""
for char in string:
    if char in vowels:
        result += "*"
    else:
        result += char
print("String after replacing vowels:", result)

Nested Loops test