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You added a FileHandler to your Flask app logger but no logs appear in the file. What is a likely cause?

medium📝 Troubleshoot Q6 of 15
Flask - Deployment
You added a FileHandler to your Flask app logger but no logs appear in the file. What is a likely cause?
AThe log file path is incorrect but logs still appear elsewhere
BThe Flask app is missing the @app.route decorator
CThe handler level is set higher than the log message level
DThe Flask app is running in debug mode
Step-by-Step Solution
Solution:

  1. Step 1: Check handler level vs log message level

    If handler level is higher, it ignores lower level messages.

  2. Step 2: Understand why no logs appear in file

    Messages below handler level are not written, causing empty log file.

  3. Final Answer:

    The handler level is set higher than the log message level -> Option C

  4. Quick Check:

    Handler level blocks lower level logs from file [OK]
Quick Trick: Match handler level to message level to see logs in file [OK]
Common Mistakes:
MISTAKES
  • Blaming missing route decorator for logging issues
  • Assuming wrong file path still logs elsewhere
  • Thinking debug mode disables file logging

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