3 Mar 2025
π₯ Python String Methods Cheat Sheet
Python provides many built-in methods to manipulate strings easily.
β
Common String Methods
Method - lower()
Description - Converts to lowercase
Example - "HELLO".lower() β 'hello'
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Method - upper()
Description - Converts to uppercase
Example - "hello".upper() β 'HELLO'
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Method - capitalize()
Description - Capitalizes first letter
Example - "hello world".capitalize() β 'Hello world'
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Method - title()
Description - Capitalizes first letter of every word
Example - "hello world".title() β 'Hello World'
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Method - strip()
Description - Removes whitespace from both sides
Example - " hello ".strip() β 'hello'
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Method - replace(old, new)
Description - Replaces substring
Example - "hello".replace("l", "w") β 'hewwo'
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Method - split(separator)
Description - Splits string into list
Example - "hello world".split(" ") β ['hello', 'world']
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Method - join(iterable)
Description - Joins list into string
Example - " ".join(['hello', 'world']) β 'hello world'
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Method - startswith(sub)
Description - Checks if string starts with substring
Example - "hello".startswith("he") β True
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Method - endswith(sub)
Description - Checks if string ends with substring
Example - "hello".endswith("lo") β True
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Method - find(sub)
Description - Returns index of substring (if found)
Example - "hello".find("e") β 1
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Method - count(sub)
Description - Counts occurrences of substring
Example - "hello".count("l") β 2
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Method - isalpha()
Description - Checks if all characters are alphabets
Example - "hello".isalpha() β True
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Method - isdigit()
Description - Checks if all characters are digits
Example - "123".isdigit() β True
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Method - isalnum()
Description - Checks if all characters are alphanumeric
Example - "hello123".isalnum() β True
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Method - islower()
Description - Checks if all characters are lowercase
Example - "hello".islower() β True
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Method - isupper()
Description - Checks if all characters are uppercase
Example - "HELLO".isupper() β True
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π― Bonus Methods
Method - zfill(width)
Fills string with zeros from the left
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Method - swapcase()
Swaps uppercase to lowercase and vice versa
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Method - rjust(width)
Right-align string with spaces
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Method - ljust(width)
Left-align string with spaces
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