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Python Strings

Python Strings

Python string is a immutable, sequence data type.

# 1. Creating a string
my_string = "Hello, World!"

# 2. Printing a string
print(my_string)

# 3. String length
length = len(my_string)
print(f"Length of the string: {length}")

# 4. Accessing individual characters in a string
first_char = my_string[0]  # Indexing starts from 0
print(f"First character: {first_char}")

# 5. Slicing a string
substring = my_string[0:5]  # Extracts characters from index 0 to 4
print(f"Substring: {substring}")

# 6. Concatenating strings
str1 = "Hello"
str2 = "World"
combined_str = str1 + ", " + str2
print(f"Concatenated string: {combined_str}")

# 7. String repetition
repeated_str = "Python " * 3  # Repeats the string 3 times
print(f"Repeated string: {repeated_str}")

# 8. String methods
# - Upper and lower case conversion
uppercase_str = my_string.upper()
lowercase_str = my_string.lower()
print(f"Uppercase: {uppercase_str}")
print(f"Lowercase: {lowercase_str}")

# - Checking for substrings
contains_hello = "Hello" in my_string
contains_hi = "Hi" in my_string
print(f"Contains 'Hello': {contains_hello}")
print(f"Contains 'Hi': {contains_hi}")

# - Finding the index of a substring
index_world = my_string.index("World")
print(f"Index of 'World': {index_world}")

# - Replacing substrings
new_string = my_string.replace("World", "Python")
print(f"Replaced string: {new_string}")

# - Splitting a string into a list of substrings
split_str = my_string.split(", ")
print(f"Split string: {split_str}")

# 9. String formatting
name = "Alice"
age = 30
formatted_str = f"My name is {name} and I am {age} years old."
print(formatted_str)

Python String Exercises

Exercise for Python String operations and learning

Write a Python program to find the length of a string.
Write a Python program to count the number of characters in a string.
Write a Python program to count the number of words in a string.
Write a Python program to reverse a string.
Write a Python program to check if a string is a palindrome.
Write a Python program to capitalize the first letter of each word in a string.
Write a Python program to convert a string to lowercase.
Write a Python program to remove whitespace from both ends of a string.
Write a Python program to find the index of a substring in a string.
Write a Python program to replace all occurrences of a substring with another substring in a string.
Write a Python program to split a string into a list of words.
Write a Python program to join a list of words into a single string with a specified delimiter.
Write a Python program to remove all digits from a string.
Write a Python program to count the occurrences of a specific character in a string.
Write a Python program to remove all punctuation from a string.
Write a Python program to check if a string contains only digits.
Write a Python program to check if a string contains only alphabetic characters.
Write a Python program to find the longest word in a string.
Write a Python program to reverse the order of words in a string.
Write a Python program to check if two strings are anagrams of each other.

Solutions

Here are the solutions to the 20 Python string exercises:

1. Length of a String:

string = "Hello, World!"
length = len(string)
print("Length of the string:", length)

2. Count Characters in a String:

string = "Hello, World!"
count = len([char for char in string if char.isalnum()])
print("Number of characters in the string:", count)

3. Count Words in a String:

string = "This is a sample sentence."
words = len(string.split())
print("Number of words in the string:", words)

4. Reverse a String:

string = "Hello, World!"
reversed_string = string[::-1]
print("Reversed string:", reversed_string)

5. Check for Palindrome:

string = "racecar"
is_palindrome = string == string[::-1]
print("Is it a palindrome?", is_palindrome)

6. Capitalize First Letter of Each Word:

string = "hello world"
capitalized_string = string.title()
print("Capitalized string:", capitalized_string)

7. Convert to Lowercase:

string = "Hello, World!"
lowercase_string = string.lower()
print("Lowercase string:", lowercase_string)

8. Remove Whitespace from Ends:

string = "   Trim me!   "
trimmed_string = string.strip()
print("Trimmed string:", trimmed_string)

9. Find Substring Index:

string = "Hello, World!"
substring = "World"
index = string.find(substring)
print("Index of '{}' in the string: {}".format(substring, index))

10. Replace Substring:

string = "Hello, World!"
new_string = string.replace("World", "Python")
print("Modified string:", new_string)

11. Split String into Words:

string = "This is a sample sentence."
words = string.split()
print("Words in the string:", words)

12. Join Words into String:

words = ["This", "is", "a", "sample", "sentence."]
string = " ".join(words)
print("Joined string:", string)

13. Remove Digits from String:

string = "Hello123"
without_digits = ''.join([char for char in string if not char.isdigit()])
print("String without digits:", without_digits)

14. Count Specific Character:

string = "Hello, World!"
char_to_count = ","
count = string.count(char_to_count)
print("Occurrences of '{}': {}".format(char_to_count, count))

15. Remove Punctuation from String:

import string

string_with_punctuation = "Hello, World!"
translator = str.maketrans('', '', string.punctuation)
no_punctuation_string = string_with_punctuation.translate(translator)
print("String without punctuation:", no_punctuation_string)

16. Check for Digits Only:

string = "12345"
is_digits_only = string.isdigit()
print("Contains only digits?", is_digits_only)

17. Check for Alphabetic Characters Only:

string = "Hello"
is_alpha_only = string.isalpha()
print("Contains only alphabetic characters?", is_alpha_only)

18. Find Longest Word:

string = "This is a sample sentence."
words = string.split()
longest_word = max(words, key=len)
print("Longest word:", longest_word)

19. Reverse Order of Words:

string = "This is a sample sentence."
words = string.split()
reversed_string = " ".join(reversed(words))
print("Reversed order of words:", reversed_string)

20. Check for Anagrams:

def is_anagram(str1, str2):
    return sorted(str1) == sorted(str2)

string1 = "listen"
string2 = "silent"
result = is_anagram(string1, string2)
print("Are '{}' and '{}' anagrams?".format(string1, string2), result)