fix: avoid ImportError when pinecone loads as a namespace package

[rahulsolanki001]

Problem

On Python 3.11/3.12, in certain environments (stale pinecone-client
install, partial pip unpack, or installer edge cases), the pinecone
package can be resolved as a namespace package — where
pinecone.__file__ is None and dir(pinecone) shows only stdlib dunders.

In this state, three internal callsites crash at instantiation time:

ImportError: cannot import name 'version' from 'pinecone' (unknown location)

Affected files:

• pinecone/_internal/http_client.py:20
• pinecone/admin/admin.py:11
• pinecone/grpc/__init__.py:167

The failure is deceptive: import pinecone and from pinecone import Pinecone
both succeed, but the crash only surfaces when Pinecone(api_key=...) is
first called.

Fix

Extract __version__ into pinecone/_version.py (single source of truth)
and redirect all three callsites to from pinecone._version import __version__.

Submodule imports resolve via _NamespacePath even when __init__.py is
not the active package root, so this import is robust to the namespace
package failure mode.

pinecone/__init__.py re-exports __version__ from _version.py — no
behaviour change for normal installs.

Also adds python-packages = ["pinecone"] to [tool.maturin] to make
package inclusion explicit rather than relying on auto-discovery.

Files changed

File	Change
pinecone/_version.py	New — __version__ = "9.0.0"
pinecone/__init__.py	Import from _version instead of hardcoding
pinecone/_internal/http_client.py	from pinecone._version import __version__
pinecone/admin/admin.py	Same
pinecone/grpc/__init__.py	Same
pyproject.toml	python-packages = ["pinecone"]

---

Note

Low Risk
Low risk: changes are limited to how __version__ is defined/imported and a packaging config tweak; runtime behavior should be unchanged except avoiding ImportError in edge-case installs.

Overview
Fixes a startup crash in certain Python 3.11/3.12 edge-case installs where pinecone can be resolved as a namespace package by moving __version__ into a dedicated pinecone/_version.py module.

All internal callsites that used from pinecone import __version__ (HTTP client, Admin client, and gRPC client) now import __version__ from pinecone._version, while pinecone/__init__.py re-exports it for backward compatibility. Packaging is also tightened by explicitly listing python-packages = ["pinecone"] in the maturin config.

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