Python - String Methods

String Methods

Python provides a set of built-in methods that can be applied to strings. It's important to note that all string methods return new values; they do not modify the original string.

Common String Methods

Common String Methods

capitalize()

Converts the first character to uppercase.

print("ashlya".capitalize())  # Output: Ashlya

casefold()

Converts the string to lowercase for case-insensitive comparisons.

print("NEPAL".casefold())  # Output: nepal

center()

Returns a centered string with specified width.

print("Nepal".center(10))  # Output:   Nepal   

count()

Returns the number of times a specified value occurs in the string.

print("Pokhara is beautiful".count("a"))  # Output: 3

encode()

Returns an encoded version of the string.

print("Ashlya".encode())  # Output: b'Ashlya'

endswith()

Returns True if the string ends with the specified value.

print("Everest".endswith("st"))  # Output: True

expandtabs()

Sets the tab size of the string.

print("Nepal\tis\tbeautiful.".expandtabs(4))  # Output: Nepal    is    beautiful.

find()

Searches for a specified value and returns its position.

print("Kathmandu".find("ham"))  # Output: 3

format()

Formats specified values in a string.

print("Nepal is {}.".format("beautiful"))  # Output: Nepal is beautiful.

format_map()

Similar to format(), but uses a mapping for substitution.

print("I live in {city}.".format_map({"city": "Kathmandu"}))  # Output: I live in Kathmandu.

index()

Searches for a specified value and returns its position.

print("Bhaktapur".index("k"))  # Output: 2

isalnum()

Returns True if all characters are alphanumeric.

print("Ashlya2024".isalnum())  # Output: True

isalpha()

Returns True if all characters are alphabetic.

print("Nepal".isalpha())  # Output: True

isascii()

Returns True if all characters are ASCII characters.

print("Ashlya".isascii())  # Output: True

isdecimal()

Returns True if all characters are decimal digits.

print("2024".isdecimal())  # Output: True

isdigit()

Returns True if all characters are digits.

print("12345".isdigit())  # Output: True

isidentifier()

Returns True if the string is a valid identifier.

print("ashlya_is_awesome".isidentifier())  # Output: True

islower()

Returns True if all characters are lowercase.

print("ashlya".islower())  # Output: True

isnumeric()

Returns True if all characters are numeric.

print("12345".isnumeric())  # Output: True

isprintable()

Returns True if all characters are printable.

print("Nepal!".isprintable())  # Output: True

isspace()

Returns True if all characters are whitespace.

print("   ".isspace())  # Output: True

istitle()

Returns True if the string follows the rules of a title.

print("This Is A Title".istitle())  # Output: True

isupper()

Returns True if all characters are uppercase.

print("NEPAL".isupper())  # Output: True

join()

Joins the elements of an iterable to the end of the string.

print(", ".join(["Kathmandu", "Pokhara", "Bhaktapur"]))  # Output: Kathmandu, Pokhara, Bhaktapur

ljust()

Returns a left-justified version of the string.

print("Nepal".ljust(10))  # Output: Nepal

lower()

Converts a string to lowercase.

print("Ashlya".lower())  # Output: ashlya

lstrip()

Returns a left trim version of the string.

print("   Ashlya".lstrip())  # Output: Ashlya

maketrans()

Returns a translation table to be used in translations.

trans = str.maketrans("a", "o")
print("Nepal".translate(trans))  # Output: NePol

partition()

Returns a tuple where the string is parted into three parts.

print("Hello, Nepal!".partition(","))  # Output: ('Hello', ',', ' Nepal!')

replace()

Replaces a specified value with another value.

print("Nepal is great".replace("great", "amazing"))  # Output: Nepal is amazing

rfind()

Searches for a specified value and returns the last position of where it was found.

print("Nepal, India, China, Nepal".rfind("Nepal"))  # Output: 18

rindex()

Searches for a specified value and returns the last position of where it was found.

print("Nepal, India, China, Nepal".rindex("Nepal"))  # Output: 18

rjust()

Returns a right-justified version of the string.

print("Nepal".rjust(10))  # Output:      Nepal

rpartition()

Returns a tuple where the string is parted into three parts from the right.

print("Nepal, India, China".rpartition(","))  # Output: ('Nepal', ',', ' India, China')

rsplit()

Splits the string at the specified separator and returns a list.

print("Nepal, India, China".rsplit(", "))  # Output: ['Nepal', 'India', 'China']

rstrip()

Returns a right trim version of the string.

print("Ashlya   ".rstrip())  # Output: Ashlya

split()

Splits the string at the specified separator and returns a list.

print("Nepal, India, China".split(", "))  # Output: ['Nepal', 'India', 'China']