Exceptions in Python: Test if Condition is True (ASSERT in Python) - Python Tutorial for Beginners
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🖥️ Exceptions in Python: Test if Condition is True in Python (ASSERT in Python)
Instead of waiting for a program to crash midway, you can also start by making assertion in Python, and verify that a certain condition is met. If this condition turns out to be True, then that is excellent - your program continues. But, if the condition turns out to be False, your program will throw an Exception: AssertionError.
○ Assert in Python
Let's have a look at the following example, where it is asserted that the code will be executed on a Linux system:
import sys
assert ('linux' in sys.platform), "This code runs on Linux only."
If you run this code on a Linux machine, the assertion passes. If you were to run this code on a Windows machine, or any other machine, the outcome of the assertion would be False and the result would be the following:
Traceback (most recent call last):
File "input", line 2, in module
AssertionError: This code runs on Linux only.
In this example, throwing an AssertionError exception is the last thing that the program will do. The program will come to halt, and will not continue. BUT, What if that is not what you want?! Then, you will have to catch this Exception in Python...
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