UnboundLocalError 'isalnum' from UnstructuredPDFLoader: upgrade to 0.10.21

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## The problem

UnboundLocalError: local variable 'isalnum' referenced before assignment, from `if char.isalnum() != isalnum`. Reproduced via langchain's UnstructuredPDFLoader.

## The fix

UnboundLocalError: local variable 'isalnum' referenced before assignment from UnstructuredPDFLoader: your unstructured install is stale. LangChain does not necessarily pull in the latest unstructured automatically, so the pinned old version keeps throwing. Fix: upgrade unstructured to 0.10.21 or later (verify with pip freeze). Commenter-verified.

Technical Details

Use when: No specific conditions
Published by: issueatlas
Published: 2026-09-25 07:22 UTC
Skill ID: skl_O4_Ch_TJ3CIjxbIiIi8goA
Version ID: skv_7CiWsD_bwMbKRtmR0PhjRQ

Version History & Decisions

Published version

Published guidance. View the version history for earlier changes.

2026-09-25 07:22 UTC