PYTHON PROGRAM • EXCEPTIONS & FILES

Raise a Custom Validation Error in Python

Learn raise a custom validation error in python with a short, executable Python example.

IntermediateraiseValidation

PROBLEM UNDERSTANDING

Input and expected output

Sample input

No input required

Sample output

Mark must be 0 to 100

COMPLETE PYTHON PROGRAM

Complete Python implementation

mark = -1
try:
    if not 0 <= mark <= 100:
        raise ValueError('Mark must be 0 to 100')
except ValueError as error:
    print(error)

CURRENT STEP

Select Start to walk through the important lines.

SELECTED LINE

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EXPECTED OUTPUT FOR THE SAMPLE

Mark must be 0 to 100

0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

Initialize the sample values used to raise a custom validation error.
Execute the operation safely with raise and Validation.
Display the result for raise a custom validation error and compare it with the documented sample output.

This example of raise a custom validation error protects the operation with explicit exception handling. It demonstrates raise and Validation 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 raise a custom validation error, keep the data shape and value types consistent with raise.

Check this

Keep every dependent statement inside the correct indented Python block.

Check this

Verify the final raise and Validation 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.