Python

Regex extraction can assign a CVE to the wrong advisory without changing the distinct-ID total. Parse declaration blocks and test exact relationships.

Filtering completed tasks before slicing a pending list changes worker ownership. Partition PBS array work by immutable IDs before skipping completed tasks.

RouterOS writes autosupout.rif after a crash and tells you to send it to MikroTik support. The file is zlib sections in a bit-reversed base64, and a short Python script turns it into the kernel oops, the log and the config. It also holds your secrets in plain text.

A backup job on a macOS SMB share kept dying with EBADF. The NAS stalled under load, macOS reconnected without a word, and because the old SMB 2.1 server granted no durable handles, every open file on the share went bad, including the bash script that was running. Only the kernel log says so.

A detached wrapper already owned the work. Launching another resumable driver raced in directory cleanup and raised OSError: Directory not empty.

When a WSDL type repeats an xs:sequence instead of an element, zeep puts the items in _value_1 as a list of one-key dicts. A defensive getattr(..., None) or [] turned that schema detail into a SOAP client that reported zero messages, every time.

An invoice number with an apostrophe broke a duplicate check. urllib.parse.quote() percent-encoded the filter, the API decoded it before parsing, the malformed query got a 400, the finder returned None, and the caller pushed the invoice again.

An ERP API can answer a PUT with a 500 after it has saved the invoice. A client that retries gets a 200 and reports success with two invoices on the books. Idempotency keys and verify-by-GET did not help, because they ran outside the retry loop.

A coding agent found a bug mid-refactor and parked it as a known issue with `@unittest.expectedFailure`. Two `git log -S` runs showed nobody had ever decided it, so it was fixed the same night. The obvious `.extend()` fix would have broken an alias. Includes the skill that does the dating.

An upload classifier sent a language model the first page of each PDF. The helper indexed a dataclass like a list, the TypeError was caught and turned into an empty string, and for seven weeks the model classified every PDF by filename alone, with a confidence score attached.