Hii, learners welcome to my blog CodeWithTanveer in this post i have learn about what is string in python.
Strings are one of the most fundamental data types in Python, and mastering them is essential for any programmer. In this chapter, we’ll explore advanced string operations, including string formatting, slicing, methods, and more.
1. String Formatting in Python
Python provides multiple ways to format strings, making it easier to embed variables and expressions.
a) Using format() Method
The format() method allows you to insert values into placeholders {}.
name = "Alice"
age = 25
message = "My name is {} and I am {} years old.".format(name, age)
print(message) Output:
My name is Alice and I am 25 years old. b) f-Strings (Python 3.6+)
f-Strings provide a concise and readable way to format strings.
name = "Bob"
score = 95.5
message = f"Hello, {name}! Your score is {score}."
print(message) Output:
Hello, Bob! Your score is 95.5. 2. String Slicing
Slicing allows you to extract parts of a string using indices.
Syntax:
string[start:stop:step] Example:
text = "Python Programming"
# Get first 6 characters
print(text[0:6]) # Output: "Python"
# Get every second character
print(text[::2]) # Output: "Pto rgamn"
# Reverse a string
print(text[::-1]) # Output: "gnimmargorP nohtyP" 3. String Methods
Python provides built-in methods to manipulate strings.
a) upper() and lower()
Converts string to uppercase or lowercase.
text = "Hello World"
print(text.upper()) # Output: "HELLO WORLD"
print(text.lower()) # Output: "hello world" b) strip()
Removes leading and trailing whitespace.
text = " Python "
print(text.strip()) # Output: "Python" c) split() and join()
split()breaks a string into a list.join()combines a list into a string.
fruits = "apple,banana,cherry"
fruit_list = fruits.split(",")
print(fruit_list) # Output: ['apple', 'banana', 'cherry']
new_str = "-".join(fruit_list)
print(new_str) # Output: "apple-banana-cherry" d) replace()
Replaces a substring with another.
text = "I like Java"
new_text = text.replace("Java", "Python")
print(new_text) # Output: "I like Python" 4. String Checks
a) startswith() and endswith()
Checks if a string starts or ends with a given substring.
filename = "document.pdf"
print(filename.endswith(".pdf")) # Output: True b) isalpha(), isdigit(), isalnum()
Checks if all characters are alphabets, digits, or alphanumeric.
print("Python".isalpha()) # True
print("123".isdigit()) # True
print("Python3".isalnum()) # True 5. Escape Characters
Escape sequences allow special characters in strings.
| Escape Sequence | Meaning |
|---|---|
\n | New line |
\t | Tab |
\\ | Backslash |
\" | Double quote |
print("Hello\nWorld") Output:
Hello
World 6. Raw Strings
Raw strings ignore escape characters, useful for file paths and regex.
path = r"C:\Users\Name\Documents"
print(path) # Output: "C:\Users\Name\Documents" 7. Multiline Strings
Use triple quotes (''' or """) for multiline strings.
poem = """
Roses are red,
Violets are blue,
Python is awesome,
And so are you!
"""
print(poem) Conclusion
Python strings are versatile and come with powerful built-in methods. From formatting to slicing and manipulation, mastering these techniques will make your coding journey smoother.
Practice these concepts with different examples to strengthen your understanding. Happy coding!
