Add new subchapters

_toc.yml

@@ -12,6 +12,7 @@ chapters:
       - file: book/codequality/memory.ipynb
       - file: book/codequality/security.ipynb
       - file: book/codequality/typing.ipynb
+      - file: book/codequality/principles.ipynb
   - file: book/cooltools/index.ipynb
     sections:
       - file: book/cooltools/Chapter.ipynb
@@ -48,6 +49,7 @@ chapters:
     sections:
       - file: book/pythontricks/Chapter.ipynb
       - file: book/pythontricks/utility.ipynb
+      - file: book/pythontricks/tooling.ipynb
   - file: book/selenium/index.ipynb
     sections:
       - file: book/selenium/Chapter.ipynb

book/codequality/principles.ipynb

@@ -0,0 +1,79 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Principles for Code Quality"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## The Law of Demeter"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "\n",
+    "It's also known as the Principle of Least Knowledge, saying that an object should only communicate with its immediate neighbors, avoiding to access deeper and deeper objects.\n",
+    "\n",
+    "See below for a small example how we would violate and obey the Law of Demeter."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# Bad Example\n",
+    "class Department:\n",
+    "    def __init__(self, manager):\n",
+    "        self.manager = manager\n",
+    "\n",
+    "    def get_manager_name(self):\n",
+    "        # Bad: Accessing a method of an object deep within the hierarchy\n",
+    "        return self.manager.employee.name\n",
+    "\n",
+    "class Employee:\n",
+    "    def __init__(self, name):\n",
+    "        self.name = name\n",
+    "\n",
+    "class Manager:\n",
+    "    def __init__(self, employee):\n",
+    "        self.employee = employee\n",
+    "\n",
+    "# Good Example\n",
+    "class Department:\n",
+    "    def __init__(self, manager):\n",
+    "        self.manager = manager\n",
+    "    \n",
+    "    def get_manager_name(self):\n",
+    "        # Good: Not going deeper\n",
+    "        return self.manager.get_name()\n",
+    "\n",
+    "class Employee:\n",
+    "    def __init__(self, name):\n",
+    "        self.name = name\n",
+    "\n",
+    "class Manager:\n",
+    "    def __init__(self, employee):\n",
+    "        self.employee = employee\n",
+    "\n",
+    "    def get_name(self):\n",
+    "        return self.employee.name"
+   ]
+  }
+ ],
+ "metadata": {
+  "language_info": {
+   "name": "python"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}

book/pythontricks/tooling.ipynb

@@ -0,0 +1,66 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Tooling for Python Projects"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## `uv`: Super-fast pip Alternative "
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Forget plain pip for installing packages.\n",
+    "\n",
+    "Use `uv` for Python package installing.\n",
+    "\n",
+    "`uv` is a blazingly fast package installer and resolver, written in Rust for high performance.\n",
+    "\n",
+    "It is a drop-in replacement for pip and pip-tools, being up to 115x faster.\n",
+    "\n",
+    "`uv` is still in an early phase, but it's interesting to see where it goes."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "vscode": {
+     "languageId": "plaintext"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "!curl -LsSf https://astral.sh/uv/install.sh | sh"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {
+    "vscode": {
+     "languageId": "plaintext"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "!uv pip install requests"
+   ]
+  }
+ ],
+ "metadata": {
+  "language_info": {
+   "name": "python"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}