Last Updated : 02 Jan, 2025
Python string methods is a collection of in-built Python functions that operates on strings.
Note: Every string method in Python does not change the original string instead returns a new string with the changed attributes.
Python string is a sequence of Unicode characters that is enclosed in quotation marks. In this article, we will discuss the in-built string functions i.e. the functions provided by Python to operate on strings.
Case Changing of Python String MethodsThe below Python functions are used to change the case of the strings. Let's look at some Python string methods with examples:
Example: Changing the case of Python String Methods
Python
# Python3 program to show the
# working of upper() function
text = 'geeKs For geEkS'
# upper() function to convert
# string to upper case
print("\nConverted String:")
print(text.upper())
# lower() function to convert
# string to lower case
print("\nConverted String:")
print(text.lower())
# converts the first character to
# upper case and rest to lower case
print("\nConverted String:")
print(text.title())
# swaps the case of all characters in the string
# upper case character to lowercase and viceversa
print("\nConverted String:")
print(text.swapcase())
# convert the first character of a string to uppercase
print("\nConverted String:")
print(text.capitalize())
# original string never changes
print("\nOriginal String")
print(text)
Converted String: GEEKS FOR GEEKS Converted String: geeks for geeks Converted String: Geeks For Geeks Converted String: GEEkS fOR GEeKs Original String geeKs For geEkS
Time complexity: O(n) where n is the length of the string 'text'
Auxiliary space: O(1)
Here is the list of in-built Python string methods, that you can use to perform actions on string:
Function Name Description capitalize() Converts the first character of the string to a capital (uppercase) letter casefold() Implements caseless string matching center() Pad the string with the specified character. count() Returns the number of occurrences of a substring in the string. encode() Encodes strings with the specified encoded scheme endswith() Returns "True" if a string ends with the given suffix expandtabs() Specifies the amount of space to be substituted with the “\t” symbol in the string find() Returns the lowest index of the substring if it is found format() Formats the string for printing it to console format_map() Formats specified values in a string using a dictionary index() Returns the position of the first occurrence of a substring in a string isalnum() Checks whether all the characters in a given string is alphanumeric or not isalpha() Returns “True” if all characters in the string are alphabets isdecimal() Returns true if all characters in a string are decimal isdigit() Returns “True” if all characters in the string are digits isidentifier() Check whether a string is a valid identifier or not islower() Checks if all characters in the string are lowercase isnumeric() Returns “True” if all characters in the string are numeric characters isprintable() Returns “True” if all characters in the string are printable or the string is empty isspace() Returns “True” if all characters in the string are whitespace characters istitle() Returns "True" if the string is a title cased string isupper() Checks if all characters in the string are uppercase join() Returns a concatenated String ljust() Left aligns the string according to the width specified lower() Converts all uppercase characters in a string into lowercase lstrip() Returns the string with leading characters removed maketrans() Returns a translation table partition() Splits the string at the first occurrence of the separator replace() Replaces all occurrences of a substring with another substring rfind() Returns the highest index of the substring rindex() Returns the highest index of the substring inside the string rjust() Right aligns the string according to the width specified rpartition() Split the given string into three parts rsplit() Split the string from the right by the specified separator rstrip() Removes trailing characters splitlines() Split the lines at line boundaries startswith() Returns "True" if a string starts with the given prefix strip() Returns the string with both leading and trailing characters swapcase() Converts all uppercase characters to lowercase and vice versa title() Convert string to title case translate() Modify string according to given translation mappings upper() Converts all lowercase characters in a string into uppercase zfill() Returns a copy of the string with ‘0’ characters padded to the left side of the stringNote: For more information about Python Strings, refer to Python String Tutorial.
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