python exceptions examples
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Exceptions are events that occur during the execution of a program that disrupt the normal flow of instructions. In Python, exceptions are handled using the try, except block. This tutorial aims to provide a comprehensive understanding of Python exceptions with practical code examples.
The basic structure of a try, except block is as follows:
In this example, attempting to divide by zero raises a ZeroDivisionError. The code in the except block handles this exception, printing an error message. The finally block is always executed, displaying a completion message.
This example attempts to open a file that doesn't exist, resulting in a FileNotFoundError. The except block handles this exception, printing an error message. The finally block is executed regardless of whether an exception occurs or not.
In this example, a custom exception CustomError is defined. If the user enters a negative age, the program raises this custom exception. The except block handles the custom exception, printing an error message. The finally block is executed regardless of the input.
Understanding and handling exceptions is crucial for writing robust and error-tolerant Python programs. The try, except block provides a mechanism to gracefully manage unexpected situations and allows for better control over the program's flow. Always consider the specific exceptions that might be raised in your code and handle them appropriately.
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