Python - Standard Library Usage
You want to safely read an environment variable 'TIMEOUT' as an integer with a default of 30 if not set or invalid. Which code snippet correctly does this?
You want to safely read an environment variable 'TIMEOUT' as an integer with a default of 30 if not set or invalid. Which code snippet correctly does this?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze each option for safety
timeout = int(os.getenv('TIMEOUT', '30')) converts default string '30' but fails if TIMEOUT is set to invalid string. timeout = int(os.environ['TIMEOUT']) or 30 raises KeyError if missing. timeout = int(os.getenv('TIMEOUT')) if os.getenv('TIMEOUT') else 30 fails if TIMEOUT is invalid string. try:\n timeout = int(os.getenv('TIMEOUT'))\nexcept (TypeError, ValueError):\n timeout = 30 uses try-except to catch missing or invalid values safely.Step 2: Choose the safest approach
try:\n timeout = int(os.getenv('TIMEOUT'))\nexcept (TypeError, ValueError):\n timeout = 30 handles missing and invalid values gracefully by catching exceptions and setting default.Final Answer:
try:\n timeout = int(os.getenv('TIMEOUT'))\nexcept (TypeError, ValueError):\n timeout = 30 -> Option BQuick Check:
Safe int read with default = try-except [OK]
Quick Trick: Use try-except to handle invalid or missing env vars safely [OK]
Common Mistakes:
- Assuming default in getenv handles invalid strings
- Using or 30 which doesn't catch exceptions
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