[Solved] You want to write a function that reads a numbe... Which code correctly implements exception chaining?class MyError(Exception): pass def read_number(s): try: return int(s) except ValueError as e: ??? | Python

Python - Advanced Exception Handling

You want to write a function that reads a number from a string and raises a custom MyError if conversion fails, but also keep the original error for debugging. Which code correctly implements exception chaining?

class MyError(Exception):
    pass

def read_number(s):
    try:
        return int(s)
    except ValueError as e:
        ???

Araise MyError('Invalid number') from e

Braise MyError('Invalid number')

Craise ValueError('Invalid number') from e

Draise MyError('Invalid number', e)

Step-by-Step Solution

Solution:

Step 1: Understand the goal
The function should raise MyError but keep original ValueError linked for debugging.
Step 2: Use exception chaining syntax
Using raise MyError(...) from e correctly chains the new error to the original.
Step 3: Evaluate options
raise MyError('Invalid number') from e uses correct chaining syntax; others either lose original error or misuse arguments.
Final Answer:
raise MyError('Invalid number') from e -> Option A
Quick Check:
Use 'raise ... from e' to chain custom errors [OK]

Quick Trick: Chain custom errors with 'raise ... from e' [OK]

Common Mistakes:

Not chaining original error
Passing original error as argument incorrectly
Raising wrong exception type

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More Python Quizzes

Which code correctly implements exception chaining?

Step 1: Understand the goal

Step 2: Use exception chaining syntax

Step 3: Evaluate options

Final Answer:

Quick Check:

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