AssertionError: Assertion Failed

Why This Happens

Assert statements are debugging tools, not for validating user input. They can be globally disabled with python -O.

The Problem

def withdraw(amount):
    assert amount > 0

The Fix

def withdraw(amount):
    if amount <= 0:
        raise ValueError('Amount must be positive')

Step-by-Step Fix

1. 1

   Check the asserted condition

   Print values involved in the assertion.

2. 2

   Use proper exceptions

   Replace assert with if/raise for input validation.

3. 3

   Add assertion messages

   Use assert condition, 'explanation'.