Challenge: Combining else and except
Combining else and except in try-except Blocks
Using try-except-else in Python allows you to clearly separate normal program logic from error handling. The except block handles exceptions if they occur, while the else block runs only when no exception is raised. This makes your code easier to read and maintain.
Consider a scenario where you want to convert a string to an integer. If the conversion fails, you need to handle the error. If it succeeds, you want to continue with normal logic. Placing the success logic in an else block ensures it only runs when no exceptions are raised, keeping your error handling and normal logic distinct.
Benefits of using else with try-except:
- Improves code clarity by separating error handling from normal logic;
- Prevents accidental execution of code that should only run when no errors occur;
- Makes your intent explicit to anyone reading your code.
This approach is especially helpful in larger programs where mixing error handling and normal logic can lead to confusion or subtle bugs.
Swipe to start coding
Write a function named convert_and_report that takes a single string argument. Inside the function:
- Use a
tryblock to attempt to convert the string to an integer. - If the conversion is successful, use the
elseblock to print"Conversion successful: {value}", where{value}is the integer result. - If a
ValueErroroccurs during conversion, catch it in theexceptblock and print"Conversion failed: invalid integer".
Call your function with the following inputs:
'42''abc'
Your output should be:
Conversion successful: 42
Conversion failed: invalid integer
Soluzione
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Can you show an example of using try-except-else in Python?
When should I use the else block in a try-except statement?
Are there any best practices for structuring try-except-else blocks?
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Combining else and except in try-except Blocks
Using try-except-else in Python allows you to clearly separate normal program logic from error handling. The except block handles exceptions if they occur, while the else block runs only when no exception is raised. This makes your code easier to read and maintain.
Consider a scenario where you want to convert a string to an integer. If the conversion fails, you need to handle the error. If it succeeds, you want to continue with normal logic. Placing the success logic in an else block ensures it only runs when no exceptions are raised, keeping your error handling and normal logic distinct.
Benefits of using else with try-except:
- Improves code clarity by separating error handling from normal logic;
- Prevents accidental execution of code that should only run when no errors occur;
- Makes your intent explicit to anyone reading your code.
This approach is especially helpful in larger programs where mixing error handling and normal logic can lead to confusion or subtle bugs.
Swipe to start coding
Write a function named convert_and_report that takes a single string argument. Inside the function:
- Use a
tryblock to attempt to convert the string to an integer. - If the conversion is successful, use the
elseblock to print"Conversion successful: {value}", where{value}is the integer result. - If a
ValueErroroccurs during conversion, catch it in theexceptblock and print"Conversion failed: invalid integer".
Call your function with the following inputs:
'42''abc'
Your output should be:
Conversion successful: 42
Conversion failed: invalid integer
Soluzione
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