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The raising of an exception interrupts normal program flow and transfers control to an exception handler.
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Exception handlers are defined using the try … except construct.
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The try blocks define a context in which exceptions can be detected.
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Corresponding the except blocks define handlers for specific types of exceptions.
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Python uses exceptions pervasively and many built-in language features depend on them.
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The except blocks can capture an exception object, which is often of a standard type such as ValueError, KeyError or IndexError.
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Programmer errors such as IndentationError and SyntaxError should not normally be handled.
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Exceptional conditions can be signaled using the raise keyword which accepts a single parameter of an exception object.
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Raise without an argument within an except block re-raises the exception which is currently being processed...




















































