String Operations in Python
From the Python cheat sheet · Strings & Formatting · verified Jul 2026
String Operations
Common string methods and operations.
python
s = "Hello, World!"
s.lower() # "hello, world!"
s.upper() # "HELLO, WORLD!"
s.strip() # Remove whitespace
s.split(", ") # ["Hello", "World!"]
s.replace("World", "Python")
s.startswith("Hello") # True
"World" in s # True💡 Strings are immutable — methods return new strings, they don't modify in place
⚡ Use "in" for substring checks — it's more Pythonic than .find()
📌 .find() returns -1 if not found; .index() raises ValueError
🟢 Use s[::-1] to reverse a string with slicing
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