An 'IndexError' occurs when trying to access an index that is out of range for a list or other indexable data structure. Ensure that your indices are within the valid range, which is from 0 to length-1.

The 'IndexError' is a common exception in Python that occurs when attempting to access an index that is out of the valid range for a list or other indexable data structure, such as tuples or strings. This error arises frequently when the code assumes an index is valid without verifying its range. To resolve an IndexError, start by examining the traceback to identify where the error occurred. Use the len() function to determine the length of the list and ensure that any index you are trying to access falls within the range from 0 to length - 1. To avoid this error, consider implementing checks before accessing list elements, such as using conditional statements to ensure that the index is valid. If your code involves loops, make sure that the iteration variables do not exceed the bounds of the list. Additionally, using for-loops to iterate through the elements of a list can help avoid manually managing indices and reduce the risk of IndexErrors. By following these guidelines, you can effectively prevent and manage IndexErrors in your Python code.