Flask - Deployment
Which of the following is the correct syntax to get an environment variable named
DATABASE_URL with a default fallback in Flask?Which of the following is the correct syntax to get an environment variable named DATABASE_URL with a default fallback in Flask?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify correct function to get env var with default
os.getenv() accepts a key and optional default value.Step 2: Check syntax correctness of options
os.getenv('DATABASE_URL', 'sqlite:///default.db') uses os.getenv correctly; os.get('DATABASE_URL', 'sqlite:///default.db') uses non-existent os.get; os.environ.get(key='DATABASE_URL', default='sqlite:///default.db') uses invalid keyword arguments (dict.get expects positional args for key and default); os.environ['DATABASE_URL', 'sqlite:///default.db'] uses wrong syntax for dict access (tuple key).Final Answer:
os.getenv('DATABASE_URL', 'sqlite:///default.db') -> Option DQuick Check:
Correct env var syntax = os.getenv(key, default) [OK]
Quick Trick: Use os.getenv('VAR', default) to safely read env vars [OK]
Common Mistakes:
MISTAKES- Using os.get instead of os.getenv
- Incorrect dict access syntax for os.environ
- Confusing os.environ and os.getenv usage
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