Try–except–else behavior in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of try-except-else with no exception

What is the output of this Python code?

Python

try:
    print("Start")
except ValueError:
    print("Error")
else:
    print("No Error")
print("End")

A Start\nNo Error\nEnd

B Start\nError\nNo Error\nEnd

C Start\nError\nEnd

D No Error\nEnd

💡 Hint

The else block runs only if no exception occurs in try.

Since no exception is raised, the try block prints 'Start', then else block prints 'No Error', and finally 'End' is printed.

❓ Predict Output

intermediate

Output when exception is caught in try-except-else

What is the output of this code?

Python

try:
    x = int('abc')
except ValueError:
    print('Caught ValueError')
else:
    print('No Error')
print('Done')

A No Error\nDone

B Caught ValueError\nDone

C Done

D Caught ValueError\nNo Error\nDone

💡 Hint

The else block does not run if an exception is caught.

The int conversion raises ValueError, so except block runs printing 'Caught ValueError'. The else block is skipped. Then 'Done' is printed.

❓ Predict Output

advanced

Behavior of try-except-else with finally

What is the output of this code snippet?

Python

try:
    print('Try block')
except Exception:
    print('Except block')
else:
    print('Else block')
finally:
    print('Finally block')

A Finally block

B Try block\nExcept block\nFinally block

C Try block\nFinally block

D Try block\nElse block\nFinally block

💡 Hint

Finally block always runs after try-except-else.

No exception occurs, so try prints 'Try block', else prints 'Else block', and finally prints 'Finally block'.

❓ Predict Output

advanced

Output when exception not caught by except

What happens when this code runs?

Python

try:
    print(10 / 0)
except ValueError:
    print('ValueError caught')
else:
    print('No Error')
print('After try-except')

A ZeroDivisionError is raised, program stops before printing 'After try-except'

B ValueError caught\nAfter try-except

C No Error\nAfter try-except

D After try-except

💡 Hint

Only ValueError is caught, ZeroDivisionError is not handled here.

ZeroDivisionError occurs but except only catches ValueError, so error propagates and program stops before last print.

🧠 Conceptual

expert

Understanding try-except-else-finally execution order

Consider this code:

try:
    print('A')
except Exception:
    print('B')
else:
    print('C')
finally:
    print('D')

What is the order of printed lines when no exception occurs?

A A, D, C

B A, B, C, D

C A, C, D

D D, A, C

💡 Hint

Else runs only if no exception, finally always runs last.

When no exception occurs, try prints 'A', else prints 'C', finally prints 'D'. So order is A, C, D.