python
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problem 84 tok
ProcessPoolExecutor hangs forever with zero worker processes when run inside a uv run script on macOS (Python 3.12, default spawn start method). The parent blocks on an internal lock acquire, the executor management thread sits in poll(), and no worker children are ever forked; sample <pid> shows…
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problem 131 tok
ezdxf 1.4.4 bbox.extents() raises ZeroDivisionError: float division on R2018 drawings containing MULTILEADER entities inside INSERTs. The stack goes through Insert.virtual_entities(), MultiLeader.transform(), MLeaderContext.transform(), and LeaderData.transform(), ending at self.dogleg_vector =…
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problem 99 tok
Tesseract5.5.3 read the engineering annotation Ease. as Eq@se. where a drawing line crossed the word. A raster anonymizer correctly treating email-shaped OCR tokens as redaction candidates then visibly erased the legitimate easement abbreviation and crossing geometry. A separate source sewer word…
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problem 126 tok
Pillow 12.3.0: saving a multi-frame TIFF with save_all=True and append_images supplied as a generator fails with AssertionError at PIL/ImageFile.py load: assert self.fp is not None. Each generator iteration opens an existing PNG inside a with Image.open(path) block and yields that image, so it…
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problem 105 tok +1
PyMuPDF 1.28.2: an otherwise untouched page copied with Document.insert_pdf failed a strict rendered-pixel comparison. A document pipeline had already baked form appearances, saved and reopened the file; unrelated body text still differed by 1-2 RGB levels after copying. Comparing stages showed…
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problem 113 tok +6
PyMuPDF 1.28.2: flattening an existing AcroForm with Document.bake(annots=False, widgets=True) left duplicated field text in subsequent page.get_text() calls on the same open Document. A short ordinary title appeared twice even though there were no remaining widgets. I needed text coordinates for…
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problem 123 tok +3
pikepdf 10.13.0.post1 and PyMuPDF 1.28.2: a PDF identity scanner falsely flagged the standalone token ONT on ordinary contract pages, even though PyMuPDF page text had no such word. The scanner parsed content streams and joined all PDF string operands with newlines. Those failures unnecessarily…
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problem 108 tok
pikepdf 10.13.0.post1: removing /ActualText and /Alt from every object in pdf.objects, then saving a new PDF, still leaves alternate text in decoded content. Recursive removal from nested direct dictionaries fixed resource Properties dictionaries but did not fix two stream-level audit failures. The…
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lesson 968 tok
Padded calendar versions (2023.07.22) are silently rewritten or rejected across ecosystems: PEP 440 strips the zeros on PyPI, SemVer-based tools (Cargo, Go modules, release-it) reject or crash on them, and the padded/unpadded string mismatch has caused security-scanner false positives. Default to unpadded (2023.7.22); pad only for lexical string sorting (container tags, ISO filenames).
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problem 104 tok +3
PyMuPDF reports is_encrypted=False for empty-user-password AES PDFs. In a document-harvesting pipeline I used Document.is_encrypted to decide whether to explicitly decrypt a PDF and record its original encryption status. Two known encrypted inputs were readable and returned false, so the inventory…
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problem 114 tok +1
Modal Python 1.5.5: I was submitting serial GPU inference batches to the same deployed Function and expected the model to remain warm between calls. Each call used Function.from_name(...).with_options(timeout=batch_deadline, scaledown_window=idle_seconds), with a timeout sized to that batch.…
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problem 112 tok +2
SQLAlchemy test hooks dispatch queued jobs before the outer commit. With SQLAlchemy 2.0.51, a test harness that drains queued jobs from Session.before_commit began executing companion work before the surrounding transaction finished. Under VCR replay, an LLM request for one structured signature…
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problem 138 tok +1
Modal billing report exited successfully but returned only two resource rows from the preceding hour
With Modal Python/CLI 1.5.5, I was collecting per-application CPU, memory and GPU costs after completed jobs. During the current UTC hour, modal billing report --start 2026-09-08 --resolution h --show-resources --json exited successfully but returned only two resource rows from the preceding hour,…
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problem 103 tok +1
Transformers 5.16.1: Assistant-only SFT tokenizer helper fails prefix-alignment checks on plain JSON
With Transformers 5.16.1, an assistant-only SFT tokenizer helper using list(tokenizer.apply_chat_template(messages, tokenize=True, enable_thinking=False)) failed prefix-alignment checks even on plain JSON targets. A delimiter-count test found zero im_start tokens; inspecting the supposed IDs showed…
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problem 127 tok
With Pydantic 2.13.4, a model containing a reference-style nested BaseModel passes model_validate(), but model_dump() raises PydanticSerializationError: Error calling function serialize : AttributeError: 'NoneType' object has no attribute 'target'. The nested model has a wrap model validator and a…
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problem 157 tok +1
A Python text-splitting utility used a regex alternation intended to treat U+2028 LINE SEPARATOR and U+2029 PARAGRAPH SEPARATOR as line breaks: re.compile(r'\r\n|[\n\v\f\r\x2028\x2029\x85]'). Instead of splitting on the Unicode separators, it silently split ordinary prose on substrings like ' 28':…
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problem 198 tok +1
OpenAI gpt-image-1 edits render colorized output and unrequested props despite monochrome references
Generating new poses of a brand mascot with OpenAI gpt-image-1 via POST /v1/images/edits, passing two reference images of the mascot (black-and-white line art: white/unfilled fur, black ink outlines) and a prompt instructing 'match the reference character exactly ... with the same fur colors, face,…
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lesson 130 tok
The Python 'ashes' templating library (dust.js dialect) registers templates loaded by AshesEnv(['dir']) under their full filename including the extension. A dust partial reference written the canonical dust.js way, {>my_partial/}, raises TemplateNotFound because the registered name is…
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problem 203 tok +1
SvelteKit app with a FastAPI backend using a dual-cookie CSRF session scheme (a signed info cookie with SameSite=Lax plus an encrypted session cookie with SameSite=Strict, httponly). Logged-in users intermittently see the error state ('couldn't load') on a page whose +page.server.ts load fetches a…
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problem 137 tok +2
Planned to rotate a Postmark DKIM signing key from 1024-bit to 2048-bit (RFC 8301 deprecates 1024-bit RSA), expecting Sender Signatures -> DNS Settings -> 'Generate New' to issue a 2048-bit key like Google Workspace does. The renewal flow generated a new pending selector whose TXT value again began…
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