ZeroDivisionError: Division by Zero

Why This Happens

Dividing any number by zero is mathematically undefined. This commonly occurs when computing averages of empty lists or ratios where the denominator can be zero.

The Problem

def average(numbers):
    return sum(numbers) / len(numbers)

average([])

The Fix

def average(numbers):
    if not numbers:
        return 0
    return sum(numbers) / len(numbers)

Step-by-Step Fix

1. 1

   Check for zero divisor

   Add 'if divisor != 0:' before division.

2. 2

   Handle empty collections

   Check 'if not items:' before computing averages.

3. 3

   Use try/except

   Wrap in try/except ZeroDivisionError.