Fix pres function (without unittest)

ipynb/pres030_functions.ipynb

@@ -38,7 +38,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 1,
    "metadata": {},
    "outputs": [
     {
@@ -86,12 +86,10 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [],
    "source": [
-    "import unittest \n",
-    "\n",
     "def add(arg0, arg1):\n",
     "    \"\"\"Print and return the sum of the two arguments (duck typing).\"\"\"\n",
     "    result = arg0 + arg1\n",
@@ -168,12 +166,10 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [],
    "source": [
-    "import unittest\n",
-    "\n",
     "def add_second_twice(arg0, arg1):\n",
     "    \"\"\"Return the sum of the first argument with twice the second one.\n",
     "        Arguments should be of type that support sum and product by \n",
@@ -182,8 +178,7 @@
     "        :param arg1: second argument \n",
     "        :return: arg0 + 2 * arg1\n",
     "    \"\"\"\n",
-    "    pass\n",
-    "\n"
+    "    pass\n"
    ]
   },
   {
@@ -201,7 +196,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 7,
    "metadata": {
     "slideshow": {
      "slide_type": "-"
@@ -221,7 +216,7 @@
        "16"
       ]
      },
-     "execution_count": 5,
+     "execution_count": 7,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -239,32 +234,14 @@
     "    print(f'arg0 + 2*arg1 = {arg0} + 2*{arg1} = {result}')\n",
     "    return result\n",
     "\n",
-    "myfunc(4, 6)"
+    "add_second_twice(4, 6)"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": null,
    "metadata": {},
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "arg0 + 2*arg1 = a + 2*b = abb\n"
-     ]
-    },
-    {
-     "data": {
-      "text/plain": [
-       "'abb'"
-      ]
-     },
-     "execution_count": 6,
-     "metadata": {},
-     "output_type": "execute_result"
-    }
-   ],
+   "outputs": [],
    "source": [
     "myfunc('a', 'b')"
    ]
@@ -306,7 +283,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.5"
+   "version": "3.7.2"
   }
  },
  "nbformat": 4,