Summary This postmortem article discusses two Python programs that were written to solve specific problems, but contained errors that led to their failure. The first program was designed to read strings from a file and write to an output file all strings that appear as a substring of at least one other string in the … Read more
Summary A junior developer needed to extract the maximum score for a specific student from a CSV file, along with the corresponding subject. The standard approach using pandas (loading the entire dataset into memory) works for small files but introduces unnecessary overhead and potential memory saturation for large datasets. A more senior-engineer approach utilizes Python’s … Read more
Summary The question revolves around the behavior of lazy-loading images in HTML, specifically when an image is set to display:none by CSS and has a loading=”lazy” attribute. The goal is to understand whether such an image will be loaded with the page, and if the positioning on the page affects this behavior. Root Cause The … Read more
Summary The user is struggling to create a Straight Table in Qlik with three columns: current month sales, previous year sales for the same month, and a formatted date. The user attempted to use complex Set Analysis modifications to manually shift the selection context, which resulted in zero values or errors. The core issue is … Read more
Summary A UI Interaction Conflict occurred where tapping a radio button in a PersonaliseCellView inadvertently triggered the action of an adjacent “Edit” button. This was caused by improper view re-rendering logic (specifically a mix of @ObservedObject and @State updates) that reset the visual state of the radio buttons within a List, effectively hijacking the touch … Read more
Summary The core issue is a runtime permission change in Android 15 (SDK 35/36) and Google Play Services for Wear OS, which invalidates the implicit background weather fetch used by older watch face implementations. While the real Pixel Watch 3 (likely running an older or stable Wear OS build) permits the legacy com.google.android.wearable.permission.ACCESS_WEATHER behavior, the … Read more
Summary The issue lies in the way Redis is being mocked using MagicMock. The mock_redis.get.return_value is set to b’1′ for the first user and then changed to b’2′ for the second user. However, this change does not reflect in the response because the mock_redis.incr.return_value is not updated accordingly. Root Cause The root cause of this … Read more
Summary A clipPath defined on a single fabric.Group unexpectedly affects the entire canvas, causing all objects to be clipped. This issue stems from state leakage in Fabric.js’s rendering pipeline, where a group’s transformation matrix and clipping context are not properly isolated or reset after drawing that group. The root cause is often an improper custom … Read more
Summary We investigated an issue where Apache Tika fails to extract text from the content of a nested Structured Document Tag (SDT), also known as a Content Control, in a .docx file. The XML structure contains an SDT inside another SDT’s sdtContent. While Tika correctly extracts text from the outer and non-nested elements, the text … Read more
Summary A user reported inconsistent behavior with Intersector.intersectSegmentPolygon during pathfinding graph generation. In one context (debug rendering), line-of-sight checks between nodes succeeded, but in the primary logic path (inside pathFromTo), they failed, preventing path calculation. The root cause was mutable object state being altered by method calls, specifically the side effects of Polygon.setPosition. This caused … Read more