4.3.1
Exceptions
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Exceptions
Rather than leaving the program to crash when an error occurs, exceptions give us a chance to handle the error more gracefully.
Exceptions
- When an error arises in a program, the program is said to 'throw' an exception.
- An exception is a description of the error that arose.
- Exceptions can be 'caught' or handled rather than allowing the program to crash.
Handling exceptions
- If an exception can be dealt with internally, then we can catch the exception and continue with the program.
- This is done using a structure as below:
- try: ---
- except: ---
- The code within the try block will be executed.
- If an exception is thrown inside the try block, then the except block will be run to 'clean up' after the exception.
1Introduction to Python
1.1Python
1.2Input & Output
1.3Data Types
1.4Variables & Constants
1.6Program Flow
2Data Structures
2.1Lists & Strings
2.2File Handling
3Modularity
3.1Subroutines
3.2Data Flow
4Good Practice
4.1Naming & Whitespace
4.2Comments
4.3Exceptions
Jump to other topics
1Introduction to Python
1.1Python
1.2Input & Output
1.3Data Types
1.4Variables & Constants
1.6Program Flow
2Data Structures
2.1Lists & Strings
2.2File Handling
3Modularity
3.1Subroutines
3.2Data Flow
4Good Practice
4.1Naming & Whitespace
4.2Comments
4.3Exceptions
Practice questions on Exceptions
Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.
- 1What is it called when an error arises in a program?Multiple choice
- 2
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