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Add blog post about 2026-02-06 (#411)
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‎_posts/2026-02-06-introduction-to-second-semester.md‎

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---
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layout: post
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title: "Introduction to the second Semester"
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tags:
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- about-the-course
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---
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In class today we spoke about the coursework and I showed some concepts related
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to the [first chapter of the part of the book we're following this week](https://vknight.org/pfm/building-tools/01-variables-conditionals-loops/introduction/main.html#).
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You can see a recording of this here: [https://cardiff.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=9e3ddf0f-db5a-4238-bb89-b3e400d6c431](https://cardiff.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=9e3ddf0f-db5a-4238-bb89-b3e400d6c431)
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We spoke about the coursework:
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- You can start working on this now,
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- You can find an expected timeline of progress on the class site (right now you
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should be working to form your groups),
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- You cannot use code generation tools (chatGPT etc...)
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I also started covering some basic loops using some of the content that you saw
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during the first Semester. **You should work through the content of the first
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chapter of the Building Tools part of the text book.**
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You can find:
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- The Jupyter notebook I used in class [here]({{site.baseurl}}/assets/nbs/2025-2026/variables.ipynb)
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- The notes I wrote in class [here]({{site.baseurl}}/assets/boards/2025-2026/variables.pdf)

‎assets/boards/2025-2026/variables.pdf‎

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‎assets/nbs/2025-2026/variables.ipynb‎

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"id": "4bb0911b-c587-4373-95c6-a455e3dd2aaf",
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"source": [
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"## Variables, conditionals and loops\n",
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"\n",
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"Example:\n",
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"\n",
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"A perfect number is a positive integer whose divisors (excluding itself) sum to\n",
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"itself. For example, $6$ is a perfect number because $6 = 1 + 2 +\n",
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"3$.\n",
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"\n",
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"1. How many perfect numbers are there less than 20?\n",
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"2. What is the next perfect number?"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"id": "c80e63a8-867a-4f27-b3ea-dea37a277c5a",
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"metadata": {},
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"outputs": [],
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"source": [
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"def is_perfect(n):\n",
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" \"\"\"\n",
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" Checks if a given integer n is perfect or not.\n",
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"\n",
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" It returns True if perfect, False if not.\n",
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"\n",
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" A number is perfect if the sum of it's divisors is equal to the number itself.\n",
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"\n",
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" For example 6 = 3 + 2 + 1\n",
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" \"\"\"\n",
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" return sum(i for i in range(1, n) if (n % i == 0)) == n"
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]
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},
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{
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}
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],
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"is_perfect(n=6)"
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]
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},
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}
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],
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"is_perfect(n=5)"
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]
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},
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{
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"cell_type": "code",
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"id": "984afb25-0fa5-4922-b44a-9c73865149f6",
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"metadata": {},
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"1"
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}
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],
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"source": [
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"checks = [is_perfect(n=value) for value in range(1, 20)]\n",
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"sum(checks)"
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]
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},
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{
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"id": "ed55c270-7837-43b3-80e2-238641023782",
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"metadata": {},
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"outputs": [],
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"source": [
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"n = 496 + 1\n",
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"while (is_perfect(n) is False):\n",
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" n = n + 1"
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]
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},
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{
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