Dec 19, 2022 By Team YoungWonks *
What are errors in programming languages?
We write code in various programming languages such as Python, Java, C++ and it is not necessary each line of the code in perfect or correct. There can be faults or abnormalities in a program while we write it and these are known as errors. These errors make the program run unexpectedly. There are various types of error which can occur in a program. Let us discuss them below.
Types of Error
1. Syntax Error
This error is a common type of error which are caused when characters are missing from the basic code. The basic lines of code are not understood by the computer when these error occur. Such as in Python programming language, missing quotation marks while typing a word or a sentence or missing colon after a for loop. For example zero division error, name error and so on.
2. Logical Error or exception
This error occurs when the syntax of the program is correct but logic of the program is incorrect. In other words you expect the computer to do a particular task but it ends up giving an unexpected result.
3. Runtime error
This error occurs at the users end when the developers are unable to track some of the system based error. Here the issue is only detected when the program runs on another system. In the following example given below we can observe the syntax error and Python exception (zero division error). In the print statement there are two parenthesis which is an incorrect syntax.
Python Error Handling
In Python programming language an error can be a syntax error or an exception. The various exception errors in Python are: • IOError : If file can’t be opened from the system. • KeyboardInterrupt : When a key which is not required is pressed by the user. (Normally Ctrl + C or delete) • ValueError : When built-in function receives a wrong argument. • EOFError : If End-Of-File is hit without reading any data. • ImportError : If it is unable to find the module. Rather than debugging these errors, we will look into how to handle these error in our Python programs which is also known as Python Error Handling and Python Exception Handling. In this Python tutorial, we will discuss all the various ways to handle the errors within our program so that our program does not stop running time and again. This helps the programmer save time. There are different exceptions possible in Python.
1. Raising Exception
When an error occurs, or exception as we call it, Python program will terminate. Traceback of the error is time consuming. Therefore, we can force a specific exception to occur. The raise statement is used for the same. In the following example we can observe the raise valueerror.
2. Try-except Block
The Python try-except statement is used to catch and handle exceptions. All lines of code in the try block are executed until an exception is met in the try clause.
Basic Syntax :
try:
// Code
except:
// Code
3. Else Clause
else block is used to define a block of code to be executed if no errors were raised. Else lets you code sections that should run only when no exceptions are encountered in the try clause.
Basic Syntax :
try:
// Code
except:
// Code
else:
// Code
4. Finally Clause
The finally block will be executed regardless, if the try block raises an error or not. Finally enables you to execute sections of code that should always run, with or without any previously encountered exceptions.
Basic Syntax :
try:
// Code
except:
// Code
else:
// Code
finally:
// Code
The Importance of Python Error Handling
In the world of programming, understanding how to effectively handle errors is a crucial skill, and Python is no exception. By joining our Coding Classes for Kids, students not only learn how to write code but also how to debug and resolve errors, which is an invaluable part of the learning process. Our Python Coding Classes for Kids provide an in-depth look into Python's error-handling mechanisms, including try-except blocks and the raising of exceptions to create robust code. Additionally, for those intrigued by hardware integration and game development, our Raspberry Pi, Arduino and Game Development Coding Classes teach students how to troubleshoot and handle errors in more complex projects, blending software programming with tangible, interactive outcomes.
*Contributors: Written by Aayushi Jayaswal; Lead image by Shivendra Singh
