Code changes in Bls_Cpi_category to fetch montly file of year 2025

[niveditasing]

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[gemini-code-assist]

Summary of Changes

Hello @niveditasing, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the data ingestion process for BLS CPI category data by introducing a more resilient year-rollover mechanism. It dynamically determines the "effective" current year for data retrieval based on the availability of January files, ensuring continuous data collection even when the new year's data is not yet fully published. Additionally, it refines the monthly file download strategy and adds a robust URL existence check.

Highlights

• Year Rollover Handling: Implemented logic to dynamically adjust the 'current year' for data fetching if the January file for the actual current year is not yet published by BLS, preventing data loss during year transitions.
• URL Existence Check: Added a new utility function url_exists to verify the availability of a URL without downloading the full content, specifically designed to work around BLS's blocking of HEAD requests.
• Refined Monthly File Downloads: Updated the download strategy for current/effective year CPI-U and CPI-W files to attempt downloading all available monthly files up to the effective_max_month, rather than just January and the single latest.

Changelog

• statvar_imports/us_bls/cpi_category/cpi_category_download.py
  • Added a new utility function url_exists to check URL availability.
  • Implemented logic to determine an effective_current_year and effective_max_month based on the presence of January files for the actual current year.
  • Modified loops and download logic to use effective_current_year and effective_max_month for fetching c-cpi-u, historical January, and current year cpi-u/cpi-w files.
  • Updated logging messages to reflect the use of the effective year.
  • Adjusted the latest_year and years_to_download_zip parameters to align with the effective_current_year logic.

Activity

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Code Review

This pull request updates the download script for BLS CPI data to handle the year-end rollover more gracefully by introducing an effective_current_year. The changes also simplify the download logic for the current year's files. My review found a couple of issues with the new logic. There's a bug in how the effective month is calculated, for which I've provided a fix. Additionally, there's a redundant block of code that attempts to download files that were already downloaded, which should be removed to improve efficiency and clarity.