Finally
A finally clause is an exception-handling block that runs when control leaves an associated protected block, whether normally or exceptionally.
Kotlin in Action, 2E
A finally block is an exception-handling block that executes after a protected block regardless of whether an exception was thrown.
- How it is used
- Provides guaranteed cleanup for exceptions, resource management, lock release, and coroutine cancellation.
- How deep it goes
- Demonstrates syntax through parsing, locking, and cancellation examples, then defers routine resource cleanup to use and withLock.
- Examples
- Uses a BufferedReader parser, a lock, file-reading use, and a cancellable database connection.
- What you can do after
- Apply it to write cleanup that remains reliable across normal completion, exceptions, and coroutine cancellation.
Python How-To
A finally clause is a block in an exception-handling construct that executes after the associated try or exception-handling clauses, including when control leaves them with a return statement.
- How it is used
- Runs unconditional follow-up code after exception handling, including completion notifications or cleanup actions.
- How deep it goes
- Explains clause placement, execution ordering, and interactions with return, break, and continue statements.
- Examples
- Uses task-string processing, ValueError handling, completion output, and a challenge where finally returns its own value.
- What you can do after
- Apply it via Python's try statement to guarantee final processing across successful, failed, and early-returning paths.
Related concepts
- try-catch statementpart of · A try-catch statement is a control-flow construct that executes code under exception handling and transfers control to a matching handler when an exception is raised.
- catch clausekind of · A catch clause is an exception-handling construct that executes a handler when an associated operation raises a matching exception or error.
- return statementhas part · A return statement ends the current function or routine invocation and optionally supplies its result to the caller.
- lockingused by · Locking is a synchronization technique that restricts concurrent access to shared resources or protected operations.
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