Exceptions handle errors from "summary" of Python Programming by John M. Zelle
When writing a program, it is important to anticipate and handle errors that may occur during its execution. Errors can happen for a variety of reasons – maybe the user entered invalid input, or a file could not be found, or a network connection failed. One way to deal with errors in Python is by using exceptions.
Exceptions in Python are objects that represent errors. When an error occurs in a program, an exception is raised. If the exception is not handled by the program, it will cause the program to terminate and display an error message. By using a try-except block, you can catch and handle exceptions in a more graceful way.
The try block is where you place the code that might raise an exception. If an exception is raised within the try block, the program jumps to the except block. The except block is where you handle the exception – you can print an error message, log the error, or take some other action. By catching exceptions, you can prevent your program from crashing and provide a better user experience.
In addition to handling exceptions, you can raise your own exceptions in Python. This can be useful when you want to signal that something unexpected has occurred in your program. To raise an exception, you use the raise statement followed by the type of exception you want to raise. You can also include an optional error message to provide more information about the exception.
Exceptions are a powerful tool in Python for dealing with errors. By handling exceptions effectively in your programs, you can ensure that they run smoothly and provide a better experience for users. Whether you are catching exceptions that arise from external factors or raising your own exceptions to signal unexpected conditions, exceptions are a key feature of Python that can help you write more robust and reliable code.
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