Have you ever wondered how to check for any conditional error in your code, do not worry. Python is a versatile programming language loved for its ease of use and readability. There are a number of built-in methods that allow you to do everyday tasks quickly and easily. Python assert statement is one of them through which you can verify conditions before executing code, thus preventing mistakes.
Assertions are a powerful part of Python programming. They help ensure that your code is correct and behaves as you expect it to. This article will walk you through the basic concept of assertions and show you how to use them in your Python code. We will also provide tips on making assertions more effective and preventing them from causing problems in your programs. So, let us get started.
Table of Contents
What is Assertion in Python?
An assertion statement is a special built-in function in the Python programming language that allows you to check whether certain conditions are met. They can be used to verify the results of specific operations, ensure the correctness of user input, or detect errors during execution. When an assertion fails, it prints out a message and proceeds with its execution only if the condition is true.
Flow Diagram
Python Assert Statement : Advantages
Assertion statements are a powerful tool that you can use in your Python code to ensure that your programs behave according to expectations. When executed, it run one or more tests and report any issues. This allows you to identify and correct errors as they happen rather than after.
Assertions can be used for various purposes, including testing program behavior, validating input data, checking for the proper execution of functions, determining whether conditions have been met, and verifying the results of calculations. Using assertions effectively in your code can avoid costly debugging sessions later on down the road.
Python Assert Statement : Disadvantages
Assertion statements can sometimes be slow, particularly when testing complex conditions. Additionally, they are not always easy to read or understand, which may confuse developers who are unfamiliar with them. Also, Assertions are not appropriate for production code for technical and practical reasons.
Syntax
An assertion statement is a type of conditional statement in Python that checks the validity of certain conditions. They are often used to determine if an expression is True or False, and can be used as part of testing routines within programs.
There are two ways to write the syntax of Assert statement in Python,
assert<condition>
In above method, an Assertion condition will follow the Boolean rule; that is, if the condition will meet the requirements code will execute; otherwise not.
assert<condition>,<error message> In the above method , An assert will follow the Boolean rule as well through the error message.
Assertion with Error Message
n1 = 15
n2 = 36
add = n1 + n2
print('The sum of the numbers')
assert add!=51 , "addition mistake"
print(add) Output
Assertion without Error Message
Assertion without error is a programming concept that helps ensure your code’s correctness. When you write code, it is essential to explicitly state whether or not an assertion has been successful. This way, you can debug any errors and ensure that your program remains correct.
To understand the concept of an assertion statement without an error message, let us consider the below code snippet in which we add two numbers, and by the Assert statement, we check whether the condition is valid or not.
n1 = 15
n2 = 36
add = n1 + n2
print('The sum of the numbers')
assert add!=51
print(add) Output
FAQs
What happens if an assert is failed?
The test is terminated when an “assertion” fails. The test will continue execution when a “verify” fails, logging the failure. If the condition is not valid within the current timeout setting, it will fail and halt the test.
How do you fix assertion errors?
We need to declare the assertion statement in the try block and catch the assertion error in the catch block to handle the assertion error.
If you unware of what is try and catch, must visit python exception handling guide.
Does assert stop execution in Python?
The conditions that are supposed to be true always are known as assertion statements. The Python program will be stopped, and the Assertion error will be thrown if the assert condition is false.
Conclusion
As you can see, Python assert statement help ensure your program’s correctness. Handled correctly, they can prevent many runtime errors. You must follow some simple steps and write an accurate assert statement. Though this process seems daunting at first, it gets easier with practice. I hope this article helped you to understand the concept of the assertion statement in Python. Thanks for reading. Happy coding!
