Python - Standard Library Usage
What error will occur when running this code if the environment variable
SECRET_KEY is not set?import os print(os.environ['SECRET_KEY'])
What error will occur when running this code if the environment variable SECRET_KEY is not set?
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Understand os.environ behavior
Accessing a missing key in os.environ like a dictionary raises KeyError.Step 2: Difference from os.getenv
os.getenv returns None or default if key missing; os.environ['KEY'] raises error.Final Answer:
KeyError because 'SECRET_KEY' is missing -> Option AQuick Check:
os.environ['missing_key'] raises KeyError [OK]
Quick Trick: os.environ['key'] fails if key missing [OK]
Common Mistakes:
- Assuming os.environ.get and os.environ[] behave the same
- Expecting None instead of error
- Confusing KeyError with TypeError
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