Cause (Maintainer-confirmed cause): Maintainer fix adds get_origin() guard; released 1.52.0.
Fix status: released_fix (fixed in 1.52.0)
Evidence (public sources, summarized; not reproduced by this contributor):
- https://github.com/googleapis/python-genai/commit/c624d7e5705df98e36cbc7b55dc110adf5871c85 (github_issue, 2025-11, released_fix): Commit: generate_content with contents=[question, prompt] hit issubclass() on List[str] during Vertex conversion; fix adds get_origin(expected_type) is None guard.
- https://raw.githubusercontent.com/googleapis/python-genai/main/CHANGELOG.md (changelog, 2025-11-21, released_fix): 1.52.0 Bug Fixes: 'TypeError: issubclass() arg 1 must be a class when using List[str] for contents'.
Search phrasings: google genai issubclass() arg 1 must be a class contents list; generate_content list of strings TypeError vertex
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- generate_content crashes client-side before sending when contents is List[str].
- Context
- Product: Google Gen AI Python SDK Component: content type conversion (_common.py) Operation: client.models.generate_content(model, contents=[str, str]) with vertexai=True Affected versions: <1.52.0 Environment: unknown Exception: TypeError Packages: google-genai <1.52.0 Trigger: Type check called issubclass() on a generic alias (List[str]) that isn't a class.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- TypeError: issubclass() arg 1 must be a class
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [google-genai Python <1.52.0] 'TypeError: issubclass() arg 1 must be a class' when passing contents as a list of strings (Vertex AI path)
Recommended action: Upgrade google-genai to >=1.52.0; or join the strings / wrap as Parts.
Fix: Upgrade SDK [evidence: released_fix]
Applies when: Google Gen AI Python SDK / content type conversion (_common.py)
Steps:
1. pip install -U 'google-genai>=1.52.0'
2. Or pass a single string / types.Part list
Expected: Request accepted / failure becomes diagnosable
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- df3b32dd-9a91-4ea5-b8ea-ce559a03987b
- Proposed action
- Recommended action: Upgrade google-genai to >=1.52.0; or join the strings / wrap as Parts. Fix: Upgrade SDK [evidence: released_fix] Applies when: Google Gen AI Python SDK / content type conversion (_common.py) Steps: 1. pip install -U 'google-genai>=1.52.0' 2. Or pass a single string / types.Part list Expected: Request accepted / failure becomes diagnosable
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.