String Methods

General Methods

Case Conversion

·         capitalize(): Converts the first character to uppercase and the rest to lowercase.

Python

text = "hello, world!"

capitalized_text = text.capitalize()  # Output: "Hello, world!"

·         lower(): Converts all characters to lowercase.

Python

text = "HELLO, WORLD!"

lower_text = text.lower()  # Output: "hello, world!"

·         upper(): Converts all characters to uppercase.

Python

text = "hello, world!"

upper_text = text.upper()  # Output: "HELLO, WORLD!"

·         swapcase(): Swaps cases, lower to upper and vice versa.

Python

text = "HeLlO, WoRlD!"

swapped_text = text.swapcase()  # Output: "hEllO, wOrLd!"

·         title(): Converts the first character of each word to uppercase.

Python

text = "hello world"

title_case_text = text.title()  # Output: "Hello World"

·         casefold(): Converts string to lowercase for caseless comparisons.

Python

text = "HELLO, WORLD!"

casefolded_text = text.casefold()  # Output: "hello, world!"

Checking String Content

·         isalnum(): Returns True if all characters are alphanumeric.

·         isalpha(): Returns True if all characters are alphabetic.

·         isdigit(): Returns True if all characters are digits.

·         isspace(): Returns True if all characters are whitespace.

·         islower(): Returns True if all characters are lowercase.

·         isupper(): Returns True if all characters are uppercase.

·         istitle(): Returns True if the string is in title case.

Searching Within a String

·         find(): Returns the index of the first occurrence of a substring.

·         rfind(): Returns the index of the last occurrence of a substring.

·         index(): Similar to find(), but raises a ValueError if not found.

·         rindex(): Similar to rfind(), but raises a ValueError if not found.

·         startswith(): Returns True if the string starts with the specified value.

·         endswith(): Returns True if the string ends with the specified value.

Modifying Strings

·         strip(): Removes leading and trailing whitespace.

·         lstrip(): Removes leading whitespace.

·         rstrip(): Removes trailing whitespace.

·         replace(): Replaces occurrences of a substring with another.

·         join(): Joins elements of an iterable into a string.

·         split(): Splits a string into a list of substrings based on a separator.

·         partition(): Splits a string into three parts based on a separator.

·         rpartition(): Splits a string into three parts, starting from the right.

Other Methods

·         count(): Returns the number of occurrences of a substring.

·         expandtabs(): Replaces tabs with spaces.

·         center(): Centers a string within a specified width.

·         ljust(): Left-justifies a string within a specified width.

·         rjust(): Right-justifies a string within a specified width.

·         zfill(): Pads a string with zeros to a specified length.

·         encode(): Encodes a string into a bytes object.

·         decode(): Decodes a bytes object into a string.

·         maketrans(): Creates a translation table for use with the translate() method.

·         translate(): Translates characters using a translation table.