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(python2.1-tut.info)Defining Clean-up Actions

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Defining Clean-up Actions
=========================

The `try' statement has another optional clause which is intended to
define clean-up actions that must be executed under all circumstances.
For example:

     >>> try:
     ...     raise KeyboardInterrupt
     ... finally:
     ...     print 'Goodbye, world!'
     ...
     Goodbye, world!
     Traceback (most recent call last):
       File "<stdin>", line 2
     KeyboardInterrupt

A _finally clause_ is executed whether or not an exception has occurred
in the try clause.  When an exception has occurred, it is re-raised
after the finally clause is executed.  The finally clause is also
executed "on the way out" when the `try' statement is left via a
`break' or `return' statement.

A `try' statement must either have one or more except clauses or one
finally clause, but not both.