Try–except execution flow in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of a try block in Python?

The try block lets you test a block of code for errors. If an error occurs, Python stops running the try block and looks for an except block to handle the error.

beginner

What happens when an exception occurs inside a try block?

Python immediately stops executing the try block and jumps to the matching except block to handle the error. If no matching except block is found, the program crashes.

beginner

Can code after the error inside a try block run if an exception occurs?

No. Once an exception happens, the rest of the try block is skipped. The program moves to the except block.

intermediate

What is the role of the else block in a try-except structure?

The else block runs only if no exceptions were raised in the try block. It is useful for code that should run only when everything in try succeeds.

intermediate

How does the finally block behave in a try-except structure?

The finally block always runs after the try and except blocks, no matter what. It is used for cleanup actions like closing files or releasing resources.

What happens if no exception occurs in the try block and there is an except block?

A The <code>try</code> block runs again.

B The <code>except</code> block runs anyway.

C The program crashes.

D The <code>except</code> block is skipped.

If no error happens, Python skips the except block and continues normally.

Where does Python jump when an exception occurs inside a try block?

A To the <code>except</code> block.

B To the next line in the <code>try</code> block.

C To the <code>else</code> block.

D To the <code>finally</code> block only.

Python stops the try block and jumps to the matching except block to handle the error.

When does the else block run in a try-except structure?

A Always, before the <code>try</code> block.

B Only if an exception occurs.

C Only if no exception occurs.

D Only if the <code>finally</code> block is missing.

The else block runs only if the try block finishes without errors.

What is guaranteed about the finally block?

A It runs only if an exception occurs.

B It always runs, no matter what.

C It runs only if no exception occurs.

D It runs only if there is an <code>else</code> block.

The finally block always runs after try and except, even if the program crashes.

If an exception is not caught by any except block, what happens?

A The program crashes and shows an error.

B The <code>else</code> block runs.

C The program continues normally.

D The <code>finally</code> block is skipped.

If no except block matches the error, the program stops and shows the error message.

Explain the flow of execution in a try-except-else-finally structure when an exception occurs.

Think about which blocks run and which are skipped when an error happens.

Describe what happens when no exception occurs in a try-except-else-finally structure.

Focus on the normal flow without errors.