[Solved] Identify the error in this code snippet that tries to read an environment variable: import os api_key = os.getenv('API_KEY') print(api_key.upper()) Assume API_KEY is not set in the environment. | Python

Python - Standard Library Usage

Identify the error in this code snippet that tries to read an environment variable:

import os
api_key = os.getenv('API_KEY')
print(api_key.upper())

Assume API_KEY is not set in the environment.

AAttributeError because api_key is null

BSyntaxError due to missing parentheses

CNo error, code runs fine

DNameError because os is not imported

Step-by-Step Solution

Solution:

Step 1: Check os.getenv return when variable missing
When API_KEY is not set, os.getenv returns null.
Step 2: Understand method call on null
Calling upper() on null causes an AttributeError because null has no such method.
Final Answer:
AttributeError because api_key is null -> Option A
Quick Check:
null.upper() causes AttributeError [OK]

Quick Trick: Check for null before calling string methods [OK]

Common Mistakes:

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