## Chapter 5 — The sharing print is one filter ### Lesson map Lesson 05. Map, example, EX051. ```mermaid flowchart TD T["Eight triples"] --> F["setting not in the allowed set"] T --> N["count of True flags"] F --> B["three names, list order"] N --> S["sensitive 5"] B --> Q{"Is the filter a later census?"} S --> Q Q -->|No| K["Keep the embedded print"] ``` One list. One membership test. Three printed numbers. ### Logical drawing ```text items 8, sensitive 5, shared too widely 3 patient-letters/: anyone-with-link invoices/: anyone-with-link old-backup.zip: anyone-with-link ``` ### Learning outcomes After this chapter, you should be able to: 1. Name the three reductions the sharing script actually computes. 2. Keep list order distinct from the April incident. 3. Refuse a note that replaces this export with a later folder state. ### 5.1 Three reductions, and no walk inside a folder. `lab_sharing.py` stores eight triples. Each triple is a name, a setting string, and a Boolean. The names are the top-level storage items only. A file inside `patient-letters/` is not a fourth field and cannot change `len(items)`. The Boolean sum is `sum(1 for i in items if i[2])`. Python counts `True` as one, so the five sensitive flags print as `sensitive 5`. That sum does not look at the setting string. `referrals/` and `booking-app-config` contribute to the five and do not contribute to the failure list. The failure list is a comprehension: keep the pair when the setting is absent from `allowed[sens]`. `allowed[True]` holds `staff` and `admins`. `allowed[False]` holds those two strings plus `public`. The comprehension does not sort. `patient-letters/` is printed first because it is the first failing triple, not because a patient mentioned it. `rota.xlsx`, `price-list.pdf`, `logo.png`, `referrals/`, and `booking-app-config` are tested and kept out of `bad`. A later staff-only change is a decision-log sentence. It is not a fourth run, and it does not edit these eight triples. Printing `shared too widely 2` would require deleting a triple this file still contains. ### 5.2 Worked example | Offered result | What produced it | Decision | |---|---|---| | `items 8, sensitive 5, shared too widely 3` | Length, Boolean sum, filter length | Keep | | The three names in list order | The comprehension, unsorted | Keep | | "The script now omits patient-letters." | No edit of the eight triples | Refuse | | "The filter counted files inside the folders." | The list has no child rows | Refuse | > **Synthetic case.** The eight triples are the only sharing output. ### Errors and limits Directory children stay uncounted. Do not repair the export so that it matches the afternoon change. ### Apply - **EX051 — One filter.** The print says 8 items, 5 sensitive, and 3 shared too widely, then names patient-letters, invoices, and old-backup.zip. May a later staff-only change, or a count of files inside those folders, replace that print? *Rubric:* 3 = no; the eight triples stay; the Boolean sum stays 5; the filter stays 3, in list order; do not edit the script;; 2 = the print stays and the later change stays prose;; 1 = one number;; 0 = none. ### Continue studying — lesson 05 (chapter 05 of 20) [← Chapter 04](#ch-04) · [Course chapter index](../SUBJECTS.md) · [Chapter 06 →](#ch-06) Continue to the next authored lesson. ## Worked answers **EX051.** No. The eight triples stay. The Boolean sum stays 5. The filter stays 3, in list order: patient-letters, invoices, and old-backup.zip. A later staff-only change and any count of files inside folders stay outside the script.