Fix AttributeError when deleting vectors in asyncio mode

[veeceey]

Summary

Fixes #564

The asyncio SDK was throwing AttributeError: 'str' object has no attribute '_response_info' when attempting to delete vectors. This bug prevented the use of asyncio delete operations.

Root Cause

The delete operation returns a simple string response, but the API client code assumed all non-dict responses were OpenAPI model objects that support dynamic attribute assignment via setattr().

The problematic code:

if isinstance(return_data, dict):
    return_data["_response_info"] = response_info
else:
    # This fails for primitive types like str
    setattr(return_data, "_response_info", response_info)

Solution

Added type checking to skip primitive types that don't support setattr():

if isinstance(return_data, dict):
    return_data["_response_info"] = response_info
elif not isinstance(return_data, (str, int, float, bool, type(None))):
    # Only set attribute on OpenAPI model objects
    setattr(return_data, "_response_info", response_info)

Changes

• asyncio_api_client.py: Added primitive type check before setattr()
• api_client.py: Applied same fix to sync client for consistency

Testing

Reproduction Script (from issue #564):

import asyncio
import pinecone

async def main():
    index_name = "test-pinecone-index"
    pinecone_client = pinecone.Pinecone(api_key="test-api-key", host="http://localhost:15080")

    if pinecone_client.has_index(index_name):
        pinecone_client.delete_index(index_name)

    pinecone_client.create_index(
        name=index_name,
        dimension=512,
        metric="cosine",
        spec=pinecone.ServerlessSpec(cloud="aws", region="us-east-1"),
        deletion_protection="disabled",
    )

    index_host = f"http://{pinecone_client.describe_index(index_name)['host']}"
    model_index = pinecone_client.IndexAsyncio(host=index_host)

    await model_index.upsert(
        vectors=[
            ("vec1", [0.1] * 512),
            ("vec2", [0.2] * 512),
        ],
        namespace="test-namespace",
    )

    # This previously failed with AttributeError, now works
    await model_index.delete(namespace="test-namespace", delete_all=True)

    pinecone_client.delete_index(index_name)

asyncio.run(main())

Expected Behavior: Delete completes successfully without errors
Actual Behavior (before fix): AttributeError: 'str' object has no attribute '_response_info'
Actual Behavior (after fix): Delete succeeds

Impact

• Fixes asyncio delete operations for all index types
• No breaking changes (only fixes broken functionality)
• Sync client also fixed for consistency
• Response info attachment still works for complex types

Environment

• Python: 3.12+
• Pinecone SDK: 8.0.0+

---

Note

Low Risk
Small, localized change to response post-processing that only adds a type guard around setattr(); low risk aside from slightly reduced _response_info attachment on primitive return types.

Overview
Prevents AttributeError when endpoints return primitive types (e.g., str) by skipping _response_info attachment via setattr() for non-model responses.

Applies the same primitive-type guard in both asyncio_api_client.py and api_client.py, while preserving _response_info injection for dict responses and OpenAPI model objects.

^{Written by Cursor Bugbot for commit bdc4bba. This will update automatically on new commits. Configure here.}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{Bugbot Autofix is OFF. To automatically fix reported issues with Cloud Agents, enable Autofix in the Cursor dashboard.}