Python String Methods (original) (raw)
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 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
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)
`
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.