Update fetch_crypto_prices.py

[snootysteppes]

• Retry Mechanism: Added a retry strategy using requests.adapters.HTTPAdapter and urllib3.util.retry.Retry. This retries failed requests up to 3 times with exponential backoff, handling network issues or server-side errors (e.g., 429, 5xx errors).

• Logging Implementation: Replaced all print statements with Python’s logging module, allowing messages to be logged at various levels (INFO, ERROR, etc.). This provides more control over log output and improves debugging.

• Environment Variable Check: Added a check to verify if BASE_URL is set in the environment variables before making the API request. If it’s missing, an error is logged.

• Session Object for Requests: Introduced a requests.Session object to improve performance by reusing connections and to easily attach the retry mechanism.

• Dynamic Crypto List: Refactored the list of cryptocurrency IDs (dai, ethereum, bitcoin) to be passed as an argument (crypto_ids) to the fetch_crypto_prices function. This allows the function to work with any set of cryptocurrencies.

• Response Validation: Added validation to ensure that all requested cryptocurrencies exist in the API response before saving the data. This prevents saving partial or incorrect data.

• Timestamp in Output Filename: The output JSON filename now includes a timestamp (crypto_prices_YYYY-MM-DD_HH-MM-SS.json), making it unique and easy to track when the data was fetched.

• Error Handling: Improved error handling by catching both `requests error messages for each.

• Docstring: Added a docstring to fetch_crypto_prices() to provide clear documentation of its purpose and arguments.

The changes make the code more reliable, flexible, and easier to maintain or troubleshoot.

[snootysteppes]

@drikusroor is this ok sir?