How do I fix: Method 2: Raising a Custom Error Instance?

Step 1: Create an instance of the exception class with your custom error message.

Coding⏱️ 2 min read📅 2026-05-31

How to Fix: How do I raise the same Exception with a custom message in Python?

Raising a custom error message in Python with a ValueError exception.

Quick Answer: Use the 'f-string' formatting to attach a custom message to the ValueError instance, e.g. raise ValueError(f

To raise the same Exception with a custom message in Python, you need to create an instance of the exception class and pass your custom error message to its constructor.

🛠️ Step-by-Step Verified Fixes

Method 1: Raising a Custom Error Instance

Step 1: Create an instance of the exception class with your custom error message.

Method 2: Raising a Custom Error Instance

Step 1: Create an instance of the exception class with your custom error message.

Here is an example:

try:

    do_something_that_might_raise_an_exception()

except ValueError as err:

    errmsg = 'My custom error message.'

    raise ValueError(errmsg) from ValueError('Original Error Message')

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