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Python String Methods

Last Updated : 10 Apr, 2024
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Python string methods is a collection of in-built Python functions that operates on lists.

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 Methods

The below Python functions are used to change the case of the strings. Let’s look at some Python string methods with examples:

  • lower(): Converts all uppercase characters in a string into lowercase
  • upper(): Converts all lowercase characters in a string into uppercase
  • title(): Convert string to title case
  • swapcase(): Swap the cases of all characters in a string
  • capitalize(): Convert the first character of a string to uppercase

Example: Changing the case of Python String Methods

Python3




# 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)
 






                        










Output


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)


List of String Methods in Python


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 string








Note: For more information about Python Strings, refer to Python String Tutorial.






                                    


                                                                          

                                        












                                      

                                                                        

                                        

                                            

                                                

                                                    

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