bug/'isalnum' referenced before assignment

[nikunjgoel95]

Describe the bug
if char.isalnum() != isalnum:
UnboundLocalError: local variable 'isalnum' referenced before assignment

To Reproduce
Provide a code snippet that reproduces the issue.

from langchain.document_loaders import UnstructuredPDFLoader

loader = UnstructuredPDFLoader(file_path, mode = "elements", strategy = "hi_res", pdf_infer_table_structure = True, hi_res_model_name = "chipper")

elements = loader.load()

Expected behavior
Expected for the contents of the PDF to load.

Screenshots

Environment Info
Please run python scripts/collect_env.py and paste the output here.
This will help us understand more about the environment in which the bug occurred.

Additional context
Add any other context about the problem here.

[Klaijan]

Hi @nikunjgoel95! if possible, would you mind sharing the document you were working on?

[arash-hajikhani]

I experienced the same issue and reported it here: langchain-ai/langchain#11247
It worked yesterday with my PDF sets and this has become an issue just in the previous hours.

[Acbet]

Yes, I just experienced the same issue. It worked a few days ago, and now it doesn't (no changes' made)

[rondinini]

Having the exact same issue

[xdurfina]

@Klaijan Hi, it is failing on this pdf. Hope it helps.

[pchalasani]

here's an error trace -- https://gist.github.com/pchalasani/802c91e897b6433551106ec51942a626

[paluskapter]

I have the same problem as well.

[awalker4]

FYI fix is almost in over here: #1586

[Klaijan]

Fix is merging real soon #1586! Thank you all for reporting the issue!

[rondinini]

@Klaijan Thank you so much for your help!

[Klaijan]

It is merged now!

[asharda]

Upgraded to langchain 0.0.312 but still getting error "An error occurred: cannot access local variable 'isalnum' where it is not associated with a value" when i try to load a pdf using UnstructuredPDFLoader

[awalker4]

Hi @asharda , can you make sure unstructured gets updated as well? pip freeze should show version 0.10.21. I'm not sure if langchain will pull in the latest automatically.