Python String Methods

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Python String Methods

Python strings come with a rich collection of built-in methods that allow you to analyze, modify, format, and validate text efficiently.

Important Note:

Strings in Python are immutable. This means every string method returns a new string and never alters the original one.

Commonly Used Python String Methods

Below is a categorized explanation of important string methods with clear examples.

Case Conversion Methods

capitalize()

Makes only the first character uppercase.

text = "python programming" print(text.capitalize())

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lower() and upper()

Convert strings to lowercase or uppercase.

name = "PyThOn" print(name.lower()) print(name.upper())

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swapcase()

Switches uppercase letters to lowercase and vice versa.

word = "Hello WORLD" print(word.swapcase())

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title()

Capitalizes the first letter of each word.

sentence = "welcome to python" print(sentence.title())

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Searching & Counting Methods

count()

Counts how many times a substring appears.

msg = "banana apple banana" print(msg.count("banana"))

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find() and rfind()

Find the position of a substring.

text = "learn python easily" print(text.find("python")) print(text.rfind("e"))

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index()

Similar to find() but throws an error if not found.

word = "developer" print(word.index("v"))

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Trimming & Alignment Methods

strip(), lstrip(), rstrip()

Remove unwanted spaces from the beginning or end.

data = " Python " print(data.strip()) print(data.lstrip()) print(data.rstrip())

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center(), ljust(), rjust()

Align text within a given width using a character.

title = "Menu" print(title.center(20, "-")) print(title.ljust(20, ".")) print(title.rjust(20, "."))

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Joining & Splitting Methods

split()

Split text into a list based on a delimiter.

languages = "Python,Java,C++" print(languages.split(","))

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join()

Join elements of a list into a single string.

items = ["2026", "01", "03"] print("-".join(items))

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splitlines()

Split text at line breaks.

lines = "Line1\nLine2\nLine3" print(lines.splitlines())

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Validation & Checking Methods

isalnum(), isalpha(), isdigit()

Check if the string consists of alphanumeric, alphabetic, or digit characters.

print("Python3".isalnum()) print("Python".isalpha()) print("12345".isdigit())

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islower() and isupper()

Check if all characters are in lowercase or uppercase.

print("hello".islower()) print("HELLO".isupper())

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startswith() and endswith()

Check how a string begins or ends.

file = "report.pdf" print(file.startswith("report")) print(file.endswith(".pdf"))

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Replacement & Translation Methods

replace()

Replace occurrences of a substring with another.

sentence = "I like Java" print(sentence.replace("Java", "Python"))

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partition()

Split into three parts: (before, separator, after).

email = "user@example.com" print(email.partition("@"))

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translate() and maketrans()

Replace multiple characters at once using a translation table.

table = str.maketrans("aeiou", "12345") text = "education" print(text.translate(table))

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Formatting & Padding

format()

Insert values into placeholders within a string.

template = "Hello {}, welcome!" print(template.format("Suriya"))

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zfill()

Pad a numeric string with zeros on the left until a specific length is reached.

order_id = "45" print(order_id.zfill(5))

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