On 06/23/2010 10:59 PM, bob gailer wrote:
On 6/23/2010 7:36 PM, Christopher King wrote:
In a try except clause, you can end with finally block. I know it
runs after the try and except blocks regardless of the outcome, but
why use it. Couldn't you just put the code after the try and except
block without using a finally block. Does the finally command do
something I don't know about. Does it make your program more
understandable in some way?
Did you read the manual?
"If finally <#finally> is present, it specifies a 'cleanup' handler.
The try <#try> clause is executed, including any except <#except> and
else <#else> clauses. If an exception occurs in any of the clauses and
is not handled, the exception is temporarily saved. The finally
<#finally> clause is executed. If there is a saved exception, it is
re-raised at the end of the finally <#finally> clause. If the finally
<#finally> clause raises another exception or executes a return
<simple_stmts.html#return> or break <simple_stmts.html#break>
statement, the saved exception is lost. The exception information is
not available to the program during execution of the finally
<#finally> clause.
"When a return <simple_stmts.html#return>, break
<simple_stmts.html#break> or continue <simple_stmts.html#continue>
statement is executed in the try <#try> suite of a try
<#try>...finally <#finally> statement, the finally <#finally> clause
is also executed 'on the way out.' A continue
<simple_stmts.html#continue> statement is illegal in the finally
<#finally> clause. (The reason is a problem with the current
implementation --- this restriction may be lifted in the future)."
--
Bob Gailer
919-636-4239
Chapel Hill NC
for the second quote, it means that the try...finally statement, finally
will always execute even if you use return, break, or continue
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