What are String Methods?
String methods are built-in functions that help us manipulate and transform text easily. Think of them as a Swiss Army knife for handling strings!
Why Use String Methods?
- Save time!
- Make text processing easier!
- Write cleaner and more efficient code!
Changing Case
Convert to Uppercase/Lowercase
text = "Hello, Python!"
print(text.upper()) # Outputs: HELLO, PYTHON!
print(text.lower()) # Outputs: hello, python!
Capitalize First Letter
print(text.capitalize()) # Outputs: Hello, python!
print(text.title()) # Outputs: Hello, Python!
Removing Unwanted Spaces
text = " Clean me up! "
print(text.strip()) # Outputs: "Clean me up!"
print(text.lstrip()) # Removes leading spaces
print(text.rstrip()) # Removes trailing spaces
Finding & Replacing
Find a Word in a String
text = "Python is awesome!"
print(text.find("Python")) # Outputs: 0
print(text.find("Java")) # Outputs: -1 (not found)
Replace Text
print(text.replace("awesome", "fantastic")) # Outputs: Python is fantastic!
Checking String Content
text = "12345"
print(text.isdigit()) # Outputs: True
print("hello".isalpha()) # Outputs: True (only letters)
print("Hello123".isalnum()) # Outputs: True (letters + numbers)
print(" ".isspace()) # Outputs: True (only spaces)
Splitting & Joining Strings
Split a String into a List
text = "apple,banana,grape"
fruits = text.split(",")
print(fruits) # Outputs: ['apple', 'banana', 'grape']
Join a List into a String
new_text = "-".join(fruits)
print(new_text) # Outputs: apple-banana-grape
Summary
| Method | Description |
|---|---|
| .upper() / .lower() | Convert case |
| .strip() | Remove whitespace |
| .find() | Find position of a substring |
| .replace() | Replace text in a string |
| .isdigit() / .isalpha() | Check content type |
| .split() / .join() | Break and merge strings |
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