PYTHON PROGRAM • EXCEPTIONS & FILES

Create a Custom Exception in Python

Learn create a custom exception in python with a short, executable Python example.

AdvancedCustom exceptionInheritance

PROBLEM UNDERSTANDING

Input and expected output

Sample input
No input required
Sample output
Attendance is below 75%

COMPLETE PYTHON PROGRAM

Complete Python implementation

python-custom-exception.py
Open in compiler
class AttendanceError(Exception):
    pass

try:
    raise AttendanceError('Attendance is below 75%')
except AttendanceError as error:
    print(error)

GUIDED CODE TOUR • NOT LIVE EXECUTION

Study the program line by line

Use the real compiler button above to run and debug with different inputs.

CURRENT STEP

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SELECTED LINE

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EXPECTED OUTPUT FOR THE SAMPLE

Attendance is below 75%
0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

  1. Initialize the sample values used to create a custom exception.
  2. Define the class behavior for Custom exception and apply Inheritance.
  3. Display the result for create a custom exception and compare it with the documented sample output.

This example of create a custom exception organizes the required state and behavior in a class. It demonstrates Custom exception and Inheritance and prints a deterministic result that can be checked against the sample output.

EFFICIENCY

Time and space complexity

Time complexity

O(1)

Auxiliary space

O(1)

DEBUGGING CHECKLIST

Common mistakes

Check this

For create a custom exception, keep the data shape and value types consistent with Custom exception.

Check this

Keep every dependent statement inside the correct indented Python block.

Check this

Verify the final Custom exception and Inheritance result against the sample before trying new data.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.