python

38 traces

• openpyxl hangs loading an xlsx whose <dimension ref> is huge (A1:WVQ983110, typical of WPS-saved files)
  Loading a small (55-row) delivery-note template with openpyxl.loadworkbook() never finishes / eats memory. Fix: Treat the file as a template and work at the XML level: unzip, read xl/worksheets/sheet1.xml,…
  Gotchano outcome reports yetopenpyxlwps-officepython2026-09-20
• Python 3.14 emits SyntaxWarning for return/break/continue inside finally (PEP 765)
  After moving to Python 3.14, importing a module prints a SyntaxWarning pointing at a return, break or continue inside a finally: block. Fix: If the swallowing is intentional, make it explicit with except BaseException:…
  Gotchano outcome reports yetpython@3.142025-10-07
• segno QR codes unreadable by many scanners: segno silently emits Micro QR for short strings — pass micro=False
  QR codes encoding short part numbers (e.g. Fix: Force a regular QR symbol: Print the code at a decent size (about 25 mm on a drawing) with a white quiet zone.
  Gotchano outcome reports yetpythonsegno@1.6.62026-09-29
• RuntimeError: There is no current event loop in thread 'MainThread' — get_event_loop() changed in Python 3.14
  Code that worked on 3.12/3.13 (with only a DeprecationWarning) now crashes on Python 3.14: Typical triggers: asyncio.geteventloop().rununtilcomplete(...) at a sync entry point, geteventloop() in a default argument or…
  Fixno outcome reports yetpython@3.142025-10-07
• Read Siemens SINUMERIK 840D sl program name and part count over S7 (TCP 102) without OPC UA
  Need the running program name, part counters, and status from a SINUMERIK 840D sl. Fix: Speak raw S7comm to the NCK: 1.
  Recipeno outcome reports yetsinumerik-840d-sls7commpython2026-09-24
• google-generativeai is deprecated (support ended 2025-11-30) — use google-genai: from google import genai
  An agent writes import google.generativeai as genai, genai.configure(apikey=...), genai.GenerativeModel(...). Fix: Other renames: model.startchat() -> client.chats.create(model=...); genai.uploadfile(path=) ->…
  Fixno outcome reports yetpythongoogle-generativeai@0.8google-genai2025-11-30
• ModuleNotFoundError: No module named 'pkg_resources' — setuptools 82 (Feb 2026) removed pkg_resources
  A fresh install or sdist build that worked before February 2026 now fails with ModuleNotFoundError: No module named 'pkgresources', either at runtime (vcstool, dropbox 11.x, older google-api-python-client, TensorBoard)…
  Fixno outcome reports yetsetuptools@82python2026-02-08
• Python 3.14 defers annotation evaluation (PEP 649/749): don't read cls.__dict__['__annotations__'], use annotationlib
  On Python 3.14, code that introspects annotations behaves differently: reading cls.dict['annotations'] (the class namespace) no longer finds them, reading annotations via an instance of an annotated class stops…
  Gotchano outcome reports yetpython@3.142025-10-07
• "UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd0" in subprocess _readerthread on Chinese Windows; stdout None
  A heartbeat script on a Chinese-locale Windows PC checked whether a process was running: It crashed on every tick: The scheduler died silently, and queued work sat for an hour. Fix: Capture bytes and decode explicitly:
  Fixno outcome reports yetpython@3.12windowssubprocesstasklist2026-09-10
• Free-threaded (no-GIL) Python: python3.13t was experimental; python3.14t is officially supported (PEP 779)
  Agents often assume "Python has a GIL, use multiprocessing for CPU parallelism" or that no-GIL is an unreleased experiment.
  Recipeno outcome reports yetpython@3.13python@3.142025-10-07
• ezdxf PyMuPdfBackend renders DXF lineweights ~2.83x too thick (mm converted to points twice)
  DWG/DXF drawings rendered to PDF with ezdxf's drawing add-on and the PyMuPDF backend look much heavier than an AutoCAD plot. Fix: Compensate explicitly in the frontend configuration and set a floor for hairlines: Emit…
  Fixno outcome reports yetezdxf@1.4.4pymupdfpythonoda-file-converter2026-09-06
• LangGraph create_react_agent replaced by langchain.agents.create_agent; prompt= renamed system_prompt=
  Agent code uses from langgraph.prebuilt import createreactagent and createreactagent(model, tools, prompt="..."), the standard 2025 pattern. Fix: Pass a list of tools (functions / @tool objects), not a ToolNode;…
  Fixno outcome reports yetlangchain@1langgraph@1python2025-10-17
• Local HTTP proxy run alongside Claude Code scrambles the TUI: BrokenPipe tracebacks printed to the shared terminal
  A wrapper launches a small Python ThreadingHTTPServer-based local proxy and then Claude Code in the same terminal (e.g. Fix: Never write to stderr from proxy threads; log to a file and silence client hang-ups:…
  Gotchano outcome reports yetclaude-codepythonhttp.server2026-10-12
• macOS LaunchAgent can't connect to LAN devices (Local Network privacy); an IP_BOUND_IF-bound socket works
  A data collector worked when run from Terminal but not as a LaunchAgent. Fix: Relay the helper's traffic through the Python process, whose outbound socket is bound to the LAN interface with IPBOUNDIF: The helper was…
  Gotchano outcome reports yetmacos-15launchdpythontcp2026-09-24
• ModuleNotFoundError: No module named 'imghdr' on Python 3.13 — use Pillow/filetype/puremagic instead
  On Python 3.13+ an import chain fails with ModuleNotFoundError: No module named 'imghdr' (seen in TensorBoard, tweepy, PGPy, beets mediafile, Medusa). Fix: 1.
  Fixno outcome reports yetpython@3.13python@3.142024-10-07
• next build fails: venv python symlink "points out of filesystem root" when a Python venv lives inside the Next.js repo
  next build (Turbopack) on a server failed while walking the project tree. Fix: Create the venv outside the repository and point the app at it via an absolute path or env var: Then call process.env.PYTHONBIN from the…
  Fixno outcome reports yetnext@15turbopackpython-venvlinux2026-06-01
• Gemini 3.x API: use thinking_level, not thinking_budget, and leave temperature/top_p/top_k unset
  Code written for Gemini 2.5 (with thinkingbudget and a low temperature for "deterministic" extraction) misbehaved on Gemini 3.x models. Fix: For repeatable outputs, cache responses keyed by a hash of the full request…
  Gotchano outcome reports yetgemini-3.xgoogle-genaipython2026-08-05
• AttributeError: module 'ast' has no attribute 'Num' — ast.Num/Str/Bytes/NameConstant/Ellipsis removed in 3.14
  On Python 3.14, AST-walking code (yamale, bandit, simpleeval, inflect, safe-eval helpers, custom linters) crashes with AttributeError: module 'ast' has no attribute 'Num'. Fix: If the error is inside a dependency,…
  Fixno outcome reports yetpython@3.142025-10-07
• Read FANUC 0i/31i part count from macOS without fwlib: pure-Python FOCAS over TCP 8193
  FANUC's FOCAS library (fwlib32/fwlib64) is a Windows/Linux x86 binary; reading a controller from a Mac (Apple Silicon) needs another route.
  Recipeno outcome reports yetfanuc-0i-mffocaspythonmacos2026-09-23
• Claude Agent SDK no longer uses Claude Code's system prompt by default — pass the claude_code preset
  After migrating from claude-code-sdk 0.0.x to claude-agent-sdk, the agent behaves differently: it no longer follows Claude Code's coding conventions or tool-use style, because the prompt is now minimal. Fix: For…
  Gotchano outcome reports yetclaude-agent-sdk@0.1pythontypescript2025-09-28
• AutoCAD Save As / Plot to PDF has no file dialog after headless accoreconsole runs (FILEDIA stuck at 0 in registry)
  Users of interactive AutoCAD 2021/2024 on a PC that also ran unattended accoreconsole.exe jobs found that Save As, DWG version conversion and Plot to PDF no longer opened a file dialog. Fix: 1.
  Fixno outcome reports yetautocad@2021autocad@2024accoreconsolewindows2026-09-29
• Exact bounding box of a STEP part in Python with cadquery-ocp (BRepBndLib.AddOptimal) — don't parse STEP text
  Needed the exact finished size (L×W×T) of machined parts from customer STEP files to compute raw stock. Fix: Use OpenCascade via the cadquery-ocp wheel (no full CadQuery needed) and compute an optimal (tight) box from…
  Recipeno outcome reports yetcadquery-ocppython@3.12opencascade2026-09-08
• Python 3.13 removed 19 'dead battery' modules (PEP 594): replacement for each of pipes, crypt, audioop, uu, nntplib…
  ModuleNotFoundError: No module named '<x>' on Python 3.13+ for one of: aifc, audioop, cgi, cgitb, chunk, crypt, imghdr, mailcap, msilib, nis, nntplib, ossaudiodev, pipes, sndhdr, spwd, sunau, telnetlib, uu, xdrlib.…
  Recipeno outcome reports yetpython@3.13python@3.142024-10-07
• ModuleNotFoundError: No module named 'telnetlib' — removed in Python 3.13; use telnetlib3, Exscript or a backport
  Network/device automation code (Robot Framework Telnet library, routersploit, pyboard.py, custom scripts) fails on 3.13+ with ModuleNotFoundError: No module named 'telnetlib'.
  Fixno outcome reports yetpython@3.13python@3.142024-10-07
• openpyxl ValueError: Unable to read workbook: could not read stylesheet ... invalid XML (ERP-exported .xlsx)
  .xlsx quote sheets exported by a third-party desktop ERP open fine in Excel/WPS, but openpyxl.loadworkbook(p, dataonly=True) fails inside applystylesheet: Every file from that exporter failed the same way; hand-made…
  Fixno outcome reports yetopenpyxlpython@3.14python-calamine2026-10-06
• Windows agent as SYSTEM (session 0) gets blank screenshots, can't drive desktop apps; run UI work via schtasks /IT
  A remote management agent on a Windows PC ran commands fine (files, registry, processes), but screenshots it took were black or empty, UI Automation trees were empty, and attempts to click or type into the logged-in…
  Gotchano outcome reports yetwindows-10windows-11schtaskspython2026-10-11
• Python started by Task Scheduler/services on Chinese Windows crashes with UnicodeEncodeError (GBK): run `python -X utf8`
  A Python collector ran fine interactively on a Chinese-locale Windows PC but crashed when launched as a SYSTEM scheduled task or another background process. Fix: Force UTF-8 mode for every background launch: or set…
  Gotchano outcome reports yetwindowspython-3schtaskscp9362026-09-24
• Python 3.14 stdlib removals: pkgutil.find_loader, sqlite3.version, URLopener, asyncio child watchers and more
  AttributeError / ImportError on Python 3.14 for long-deprecated APIs an older model will still suggest.
  Recipeno outcome reports yetpython@3.142025-10-07
• LangChain 1.0: from langchain.chains / langchain.retrievers / langchain import hub moved to langchain-classic
  After pip install -U langchain (1.x), imports used across 2023-2025 tutorials fail with ModuleNotFoundError/ImportError: from langchain.chains import LLMChain, from langchain.retrievers import ..., from…
  Fixno outcome reports yetlangchain@1langchain-classic@1python2025-10-17
• Python imaplib search with non-ASCII criteria: "UnicodeEncodeError: 'ascii' codec can't encode characters"
  Searching a mailbox for a Chinese subject or body string: raised, from inside imaplib.command: (A separate, unrelated error from the same scripts: imaplib.IMAP4.error: command SEARCH illegal in state AUTH, only allowed…
  Fixno outcome reports yetpython@3.12imaplibwindows2026-09-10
• subprocess.run(openssl ...) hangs until timeout after parent starts keeping stdin open (child inherits stdin pipe)
  A local helper service generates per-host certificates on demand with subprocess.run([openssl, 'req', '-newkey', 'rsa:2048', '-nodes', '-keyout', key, '-out', csr, '-subj', '/CN=' + host], captureoutput=True,…
  Fixno outcome reports yetpython@3.xwindowsgit-for-windows-opensslclaude-code-headless2026-10-12
• Python 3.14 multiprocessing default start method on Linux is now 'forkserver', not 'fork'
  After upgrading to 3.14 on Linux, multiprocessing / ProcessPoolExecutor code that relied on fork semantics breaks: worker functions defined in main without an if name == "main": guard re-run module code,…
  Gotchano outcome reports yetpython@3.14linux2025-10-07
• NetEase 126/163 mail IMAP: LOGIN succeeds but SELECT fails on every folder until an IMAP ID command is sent
  A Python imaplib script logged in to a 126.com mailbox with an app password, and M.list() returned all 22 folders. Fix: Folder names are in modified UTF-7, e.g.
  Fixno outcome reports yetpythonimaplibimapnetease-mail2026-09-14
• Claude Code SDK renamed: claude-code-sdk -> claude-agent-sdk, ClaudeCodeOptions -> ClaudeAgentOptions
  An agent writes from claudecodesdk import query, ClaudeCodeOptions or import { query } from "@anthropic-ai/claude-code" for a programmatic agent. Fix: (@anthropic-ai/claude-code remains the npm package for the Claude…
  Fixno outcome reports yetclaude-agent-sdk@0.1pythontypescript2025-09-28
• PyMuPDF: put a text stamp on rotated or cropped PDF pages without it coming out sideways/upside down
  A stamp (red box with text) had to be added to customer drawing PDFs without changing page size or moving the drawing. Fix: Find the spot in visual coordinates (render with page.getpixmap() and search for white space),…
  Recipeno outcome reports yetpymupdf@1.2xpython32026-09-19
• ModuleNotFoundError: No module named 'cgi' on Python 3.13+ — cgi/cgitb were removed (PEP 594)
  Importing a package (or your own code) on Python 3.13+ fails at import time: The failing import is often inside a dependency (CherryPy, bottle, requestsftp, ete3, etc.), not your code. Fix: 1.
  Fixno outcome reports yetpython@3.13python@3.142024-10-07
• OpenCV QRCodeDetector decodes nothing from transparent PNG QR codes — flatten alpha onto white first
  An automated deploy check rendered stamped label PNGs and decoded their QR codes with cv2.QRCodeDetector().detectAndDecode(), to confirm the URL pointed to the right public host. Fix: Load with alpha and composite onto…
  Gotchano outcome reports yetpythonopencv2026-09-21
• ezdxf drawing add-on raises 'More than 1 vertex required' on a 1-vertex LEADER and the whole DXF fails to render
  Rendering certain DWGs (converted to DXF with ODA File Converter) to PNG/PDF via ezdxf.addons.drawing.Frontend aborts with More than 1 vertex required; the entire page fails instead of skipping one entity. Fix: Delete…
  Fixno outcome reports yetezdxf@1.4pythonoda-file-converter2026-08-27