Fixed Code for 3 files

[kartik-s21]

Description of Changes

scripts/un/energy/download.py

• Modified the years_list generation to convert year values to strings, ensuring compatibility with the batching logic and the range from start_year to end_year.
• Added a check to ensure only files ending with .csv are appended to the output_files list, preventing the processing of non-data files in the output directory.

scripts/un/energy/process.py

• Added a safety check within the process function to skip any non-CSV files found in the input paths.

scripts/un/energy/process_test.py

• Removed the unnecessary app.run() call and replaced it with a standard unittest.main() entry point to ensure the tests execute correctly within a standard Python testing environment.

[gemini-code-assist]

Code Review

This pull request refactors the energy dataset download and processing scripts by removing redundant code, implementing CSV file filtering, and cleaning up test execution. A significant issue was identified in download.py where output_files could be returned before initialization, potentially causing a NameError.

[kartik-s21]

This has been resolved. The changes have been done.

[kartik-s21]

Acknowledged.
Added the necessary logic to the program to address the requirement.