Learn about built-in error types in Python such as IndexError, NameError, KeyError, ImportError, etc.

Remove List Duplicates Reverse a String Add Two Numbers · Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Practice Problems Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Training ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: sales@w3schools.com · If you want to report an error...

March 20, 2025 - # Common IndexError trigger numbers = [1, 2, 3] print(numbers[4]) # IndexError: list index out of range # Empty list scenario empty_list = [] print(empty_list[0]) # Another IndexError case · To mitigate IndexErrors, it comes highly recommended to implement defensive programming practices. Standard strategies include prevalidating index values against sequence lengths, utilizing Python’s built-in safeguards, and implementing proper error handling:

August 7, 2025 - In the example above, ‘numbers’ object is not callable. So, the attempt to use ‘numbers’ as a function instead of an indexable list would result in a type error. In Python, a ValueError is raised when a built-in operation or function receives an argument that has the right type but an inappropriate value.

April 27, 2026 - However, it is an invalid value, and we get a ValueError exception with the message ValueError: math domain error. The IndexError exception occurs in a Python program when we try to access an element at an index that doesn't exist in an iterable object like a string, list, or tuple.

Remove List Duplicates Reverse a String Add Two Numbers · Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Practice Problems Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Training ... The try block lets you test a block of code for errors.

Remove List Duplicates Reverse a String Add Two Numbers · Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Practice Problems Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Training ... The TypeError exception occurs if an operation tries to perform an action with an unexpected data type.

April 26, 2025 - In this article, we will discuss ... of errors in Python. There are generally two types of errors in Python i.e. Syntax error and Exceptions....

AS shown in the examples above, there are different types of built-in exceptions: ZeroDivisionError, TypeError, and NameError. You can find a complete list of built-in exceptions in the Python documentation.

Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Practice Problems Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Training ... Lists are used to store multiple items in a single variable. Lists are one of 4 built-in data types in Python used to store collections of data, the other 3 are Tuple, Set, and Dictionary, all with different qualities and usage.

Python has a set of built-in methods that you can use on lists. ... Coding fundamentals as a game. Bite-sized lessons and challenges. ... Ready to start your journey? Your streak is waiting. ... If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail: sales@w3schools.com · If you want to report an error...

Passing arguments of the wrong type (e.g. passing a list when an int is expected) should result in a TypeError, but passing arguments with the wrong value (e.g. a number outside expected boundaries) should result in a ValueError. ... Raised when a reference is made to a local variable in a function or method, but no value has been bound to that variable. This is a subclass of NameError. ... Raised when a Unicode-related encoding or decoding error occurs.

May 29, 2026 - ValueError: occurs when the operation or function receives an argument with the right type but the wrong value. ZeroDivisionError: raised when you divide a value or variable with zero. SyntaxError: raised by the parser when the Python syntax is wrong. IndentationError: occurs when there is a wrong indentation. SystemError: raised when the interpreter detects an internal error. You can find a complete list of errors and exceptions in Python by reading the documentation.

Python Examples Python Compiler Python Exercises Python Quiz Python Server Python Interview Q&A Python Bootcamp Python Certificate ... Lists are used to store multiple items in a single variable. Lists are one of 4 built-in data types in Python used to store collections of data, the other 3 are Tuple, Set, and Dictionary, all with different qualities and usage.

Exceptions come in different types, and the type is printed as part of the message: the types in the example are ZeroDivisionError, NameError and TypeError. The string printed as the exception type is the name of the built-in exception that occurred.

January 3, 2025 - IndexError: Raised when trying to access an index that is out of range in a list or tuple. KeyError: Raised when trying to access a key in a dictionary that doesn’t exist. ... In this example, if the user inputs anything other than a valid integer, a ValueError will be raised, and the program will handle it gracefully without crashing. ... For a deeper dive into OTLP headers and the OpenTelemetry Python SDK, check out our article on Whitespace in OTLP Headers and OpenTelemetry Python SDK.

Here is a list all the standard Exceptions available in Python −