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Safari | Python Developer's Handbook -> Summary





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152015024128143245168232148039199167010047123209178152124239215162147038000015005142037106

Summary

Python exceptions are mostly used for error handling and event notification. If you don't handle exceptions in your program, Python's interpreter returns traceback messages.

Python comes filled with many built-in exceptions. All these exceptions are part of the exceptions module, which is always loaded prior to any program execution.

Exceptions can be handled by using either try/except or try/finally statements. The difference between them is that an except clause is only executed when an exception is raised, and a finally clause is always executed, no matter whether an exception is raised or not. The try/finally statement is good for clean-up actions, but remember that it doesn't actually catch the exceptions.

Python supports both strings and exception classes. As exception classes are grouped within other exception classes (known as base classes), it becomes much easier to catch several different types of errors/exceptions by using just one except clause. Base classes are never raised, but can be used to catch up errors.

You can either raise your own exceptions or use Python standard exceptions. Python allows you to create your own exceptions by subclassing any standard Python exception.

Exceptions can be raised for several purposes (for example, exit the interpreter, leaving nested loops, and so on). Every time an exception is raised, an instance of the exception class is created.

The assert command helps debug your code by raising a debugging exception.

Besides the exceptions module, the sys, the errno, and the traceback modules also offer you some advanced functionality to handle exceptions.


Last updated on 1/30/2002
Python Developer's Handbook, © 2002 Sams Publishing

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2002, O'Reilly & Associates, Inc.

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