Rewrite exercise 4.4 and fix numbering exercise notebook 7

Author: carolinevancalcar

book/exercise_notebooks/exercise_notebook_4_debugging.ipynb

@@ -107,16 +107,29 @@
     }
    },
    "source": [
-    "<div class=\"alert alert-block alert-info\"><b>(Fixing) Exercise 4.4 </b><br><br><div style=\"text-align: justify\">Find the semantic error in this function.\n",
+    "<div class=\"alert alert-block alert-info\"><b>(Fixing) Exercise 4.4 </b><br><br><div style=\"text-align: justify\">\n",
     "\n",
-    "Hint: The factorial n! is defined as <code>n! = n * (n - 1) * (n - 2) * ... * 2 * 1</code>. The function uses the fact that if n > 0, <code>n! = n * (n - 1)!</code>. This is an example of a _recursive_ function, a function that calls itself.</div></div>"
+    "The factorial n! is defined as <code>n! = n * (n - 1) * (n - 2) * ... * 2 * 1</code>. The function uses the fact that if n > 0, <code>n! = n * (n - 1)!</code>. This is an example of a _recursive_ function, a function that calls itself.</div></div>\n",
+    "\n",
+    "The code below calls the function \"factorial\" with the number 4 as input. The factorial of 4 is <code>4 * 3 * 2 * 1</code>, which is 24, but the code below prints 262144. Find and fix the semantic error in this function."
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "262144"
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "def factorial(x):\n",
     "    \"returns the factorial of x\"\n",
@@ -138,7 +151,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "base",
    "language": "python",
    "name": "python3"
   },
@@ -152,7 +165,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.0"
+   "version": "3.12.7"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,
@@ -171,11 +184,6 @@
    "latex_user_defs": false,
    "report_style_numbering": false,
    "user_envs_cfg": false
-  },
-  "vscode": {
-   "interpreter": {
-    "hash": "1fe2f2b718b1108b9c4176932db8a0ead471245140baaa21ea96a4066683e6b2"
-   }
   }
  },
  "nbformat": 4,

book/exercise_notebooks/exercise_notebook_7_files.ipynb

@@ -14,19 +14,7 @@
     "  <IMG SRC=\"https://raw.githubusercontent.com/mbakker7/exploratory_computing_with_python/master/tudelft_logo.png\" WIDTH=250 ALIGN=\"right\">\n",
     "</figure>\n",
     "\n",
-    "# Exercise Notebook 6 - Python files"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "This week, please hand in your exercise as `.py` files, not notebooks.\n",
-    "See the course material for how to work with .py files. You should submit three .py files in Brightspace.\n",
-    "\n",
-    "Name your files according to this template:\n",
-    "\n",
-    "`Notebook7_Group_<N>_<exericse number>.py`"
+    "# Exercise Notebook 7 - Python files"
    ]
   },
   {