Try–except–else behavior in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the try block in Python?

The try block contains code that might cause an error. Python runs this code and watches for exceptions (errors).

beginner

What happens when an exception occurs inside a try block?

Python stops running the try block and looks for a matching except block to handle the error.

intermediate

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

The else block runs only if the try block did NOT raise any exceptions. It is for code that should run when everything goes well.

intermediate

When does the else block NOT run in a try–except–else structure?

The else block does NOT run if an exception was raised in the try block, even if the exception was caught by except.

advanced

Why use else instead of putting code after the try-except blocks?

Using else clearly shows which code runs only when no errors happen. It keeps the code organized and avoids accidentally running code after an error.

What part of try–except–else runs only if no error occurs in the try block?

A else

B except

C finally

D try

The else block runs only if the try block completes without any exceptions.

If an exception occurs in the try block and is caught, does the else block run?

A Yes, always

B Only if the exception is not caught

C Only if the exception is ValueError

D No, never

The else block does not run if any exception occurs in the try block, even if it is caught.

Where should you put code that must run regardless of errors?

A try block

B finally block

C else block

D except block

The finally block runs no matter what, whether an exception occurs or not.

What happens if no except block matches the exception raised in try?

A The except block runs anyway

B The else block runs

C The program crashes with the error

D The finally block is skipped

If no except block matches, the error is not handled and the program crashes.

Why might you use an else block after try-except?

A To run code only if no error happened

B To catch exceptions

C To run code only if an error happened

D To always run code

The else block runs only if no exceptions occur in the try block.

Explain the flow of execution in a try–except–else structure when no exceptions occur.

Think about what happens when everything goes smoothly.

Describe what happens when an exception is raised and caught in the try–except–else structure.

Focus on how the program handles errors.