import os os.environ.pop("COHERE_API_KEY", None) from llama_index.core.evaluation.retrieval.metrics import CohereRankingMeasure CohereRankingMeasure()

Raises: KeyError: 'COHERE_API_KEY' (not the helpful ValueError)

TL;DR

Change the except IndexError: block to except KeyError: in the CohereRankingMeasure.__init__ method to correctly handle the absence of the COHERE_API_KEY environment variable.

Guidance

• Identify the line of code where the except IndexError: block is located (around line 445 of metrics.py) and update it to except KeyError:.
• Verify that the COHERE_API_KEY environment variable is set before running the CohereRankingMeasure class.
• Test the updated code by running the Steps to Reproduce section and ensure that it raises a ValueError with the expected message instead of an unhandled KeyError.
• Review other parts of the codebase for similar issues where IndexError is caught instead of KeyError for dictionary key lookups.

Example

try:
    api_key = os.environ["COHERE_API_KEY"]
except KeyError:
    raise ValueError("Must pass in cohere api key or specify via COHERE_API_KEY environment variable")

Notes

This fix assumes that the intention is to raise a ValueError with a helpful message when the COHERE_API_KEY environment variable is not set. If the desired behavior is different, additional changes may be necessary.

Recommendation

Apply the workaround by changing the except IndexError: block to except KeyError: to ensure that the code correctly handles the absence of the COHERE_API_KEY environment variable and raises a ValueError with a helpful message.