Python String Methods Cheatsheet: Complete Reference

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Python String Methods Cheatsheet

A complete reference for Python's built-in string methods.

Essential String Methods

Method	Description	Example
`upper()`	Convert to uppercase	`"hello".upper()` → `"HELLO"`
`lower()`	Convert to lowercase	`"HELLO".lower()` → `"hello"`
`strip()`	Remove whitespace	`" hi ".strip()` → `"hi"`
`split()`	Split into list	`"a,b".split(",")` → `["a","b"]`
`join()`	Join list into string	`",".join(["a","b"])` → `"a,b"`
`replace()`	Replace substring	`"hello".replace("l","r")` → `"herro"`
`find()`	Find index of substring	`"hello".find("ll")` → `2`
`startswith()`	Check prefix	`"hello".startswith("he")` → `True`
`endswith()`	Check suffix	`"hello".endswith("lo")` → `True`
`format()`	String formatting	`"{} {}".format("a","b")` → `"a b"`
`count()`	Count occurrences	`"hello".count("l")` → `2`
`isdigit()`	Check if digits	`"123".isdigit()` → `True`
`isalpha()`	Check if letters	`"abc".isalpha()` → `True`
`title()`	Title case	`"hello world".title()` → `"Hello World"`

Code Examples

# Common string operations
text = "  Hello, World!  "

# Cleaning
clean = text.strip()           # "Hello, World!"
lower = clean.lower()          # "hello, world!"
upper = clean.upper()          # "HELLO, WORLD!"

# Searching
idx = clean.find("World")      # 7
count = clean.count("l")       # 3
has_hello = clean.startswith("Hello")  # True

# Transforming
replaced = clean.replace("World", "Python")  # "Hello, Python!"
words = clean.split(", ")                     # ["Hello", "World!"]
joined = " - ".join(words)                   # "Hello - World!"

# Checking
print("123".isdigit())  # True
print("abc".isalpha())  # True
print("abc123".isalnum())  # True

# F-strings (modern Python)
name = "Python"
version = 3.13
print(f"{name} {version:.1f}")  # Python 3.1

Pro Tips

Use f"{value:.2f}" for float formatting
str.join() is faster than + for concatenation
Use "in" operator: "hello" in text

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