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## Chapter 11
Exceptions

Exceptions provide a convenient way to program error and error-recovery mechanisms, and are closely related to classes. Exception support is based on 3 constructs:

Raise
  statements. To raise an exeption. This is usually done to signal an error condition.
Try ... Except
  blocks. These block serve to catch exceptions raised within the scope of the block, and to provide exception-recovery code.
Try ... Finally
  blocks. These block serve to force code to be executed irrespective of an exception occurrence or not. They generally serve to clean up memory or close files in case an exception occurs. The compiler generates many implicit Try ... Finally blocks around procedure, to force memory consistence.

11.1 The raise statement
11.2 The try...except statement
11.3 The try...finally statement
11.4 Exception handling nesting
11.5 Exception classes

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