YouTip

## Python String rstrip() Method The `rstrip()` method returns a copy of the string with trailing characters removed. By default, it removes all trailing whitespace characters (such as spaces, newlines, carriage returns, and tabs). You can also specify a custom set of characters to be stripped from the end of the string. --- ## Syntax The syntax for the `rstrip()` method is as follows: ```python str.rstrip() ``` ### Parameters * **`chars`** *(Optional)*: A string specifying the set of characters to be removed from the end of the string. If omitted or `None`, the method defaults to removing all whitespace characters. ### Return Value * Returns a **new string** with the specified trailing characters removed. The original string remains unmodified because Python strings are immutable. --- ## Code Examples Here are practical examples demonstrating how to use the `rstrip()` method in different scenarios. ### Example 1: Basic Usage and Custom Character Stripping ```python #!/usr/bin/python # -*- coding: UTF-8 -*- random_string = 'this is good ' # 1. Default behavior: Trailing spaces are removed print(random_string.rstrip()) # 2. 'si oo' is not at the very end of the string (due to trailing spaces), so nothing is removed print(random_string.rstrip('si oo')) # 3. In 'sid oo', 'd oo' matches the trailing characters (including spaces), so 'ood' is stripped print(random_string.rstrip('sid oo')) # 4. Strip 'm' and '/' from the end of a URL. Note that '.' is not removed because it is not at the end after 'm/' is stripped website = 'www.runoob.com/' print(website.rstrip('m/.')) # 5. Remove trailing commas (,), periods (.), and letters 's', 'q', or 'w' txt = "banana,,,,,ssqqqww....." x = txt.rstrip(",.qsw") print(x) # 6. Remove trailing asterisks (*) str_example = "*****this is string example....wow!!!*****" print(str_example.rstrip('*')) ``` ### Output ```text this is good this is good this is g www.runoob.co banana *****this is string example....wow!!! ``` --- ## Important Considerations ### 1. Character Set Matching (Not Substring Matching) The `chars` argument is **not** a prefix or a substring; instead, it is treated as a set of individual characters. The method will keep stripping characters from the right side of the string as long as they match any character in the provided `chars` set. For example: ```python text = "link_123" # This will strip '3', '2', and '1' because they are all present in the set "1234" print(text.rstrip("1234")) # Output: "link_" ``` ### 2. Whitespace Characters Removed by Default When no argument is passed, `rstrip()` removes all of the following standard ASCII whitespace characters: * Space (`' '`) * Newline (`'\n'`) * Carriage return (`'\r'`) * Horizontal tab (`'\t'`) * Vertical tab (`'\v'`) * Form feed (`'\f'`) ### 3. String Immutability Since strings in Python are immutable, `rstrip()` does not modify the original string in place. It always returns a newly created string.