[Term Entry] Python Strings: .removeprefix()

content/python/concepts/strings/terms/removeprefix/removeprefix.md

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+---
+Title: '.removeprefix()'
+Description: 'Returns a copy of a string with the specified prefix removed, if present.'
+Subjects:
+  - 'Computer Science'
+  - 'Data Science'
+Tags:
+  - 'Strings'
+  - 'Methods'
+CatalogContent:
+  - 'learn-python-3'
+  - 'paths/computer-science'
+---
+
+The **`.removeprefix()`** method is a built-in [string](https://www.codecademy.com/resources/docs/python/strings) method that returns a new string with the specified prefix removed, if present. If the string does not start with the given prefix, the original string is returned unchanged. This method is case-sensitive and does not modify the original string.
+
+## Syntax
+
+```pseudo
+string.removeprefix(prefix)
+```
+
+**Parameters:**
+
+`prefix`: The substring to remove from the beginning of the string.
+
+**Return value:**
+
+A new string with the prefix removed if it exists, otherwise, the original string.
+
+## Example 1: Basic Prefix Removal
+
+In this example, a matching prefix is removed from a string, or the string is left unchanged if no match is found:
+
+```py
+original_string = "Python3.9"
+result = original_string.removeprefix("Python")
+result2 = original_string.removeprefix("JavaScript")
+
+print(original_string)
+print(result)
+print(result2)
+```
+
+The code will produce this output:
+
+```shell
+Python3.9
+3.9
+Python3.9
+```
+
+## Example 2: Cleaning file paths
+
+In this example, a base directory path is stripped from a full file path to get a relative path:
+
+```py
+base_path = "/home/user/"
+absolute_file = "/home/user/project/data/file.txt"
+relative_file = absolute_file.removeprefix(base_path)
+
+print(relative_file)
+```
+
+The code will produce this output:
+
+```shell
+project/data/file.txt
+```
+
+## Example 3: Manual vs built-in removal
+
+In this example, a prefix is removed manually with [`.startswith()`](https://www.codecademy.com/resources/docs/python/strings/startswith) and then using `.removeprefix()` for comparison:
+
+```codebyte/python
+phrase = "Python is Awesome"
+prefix = "Python"
+
+# Approach 1: Manual removal
+if phrase.startswith(prefix):
+  result = phrase[len(prefix):]
+  print(result.strip())
+else:
+  print(phrase)
+
+# Approach 2: Using removeprefix()
+result2 = phrase.removeprefix(prefix)
+print(result2.strip())
+```