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   "cell_type": "markdown",
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   "metadata": {},
   "source": [
    "# Lesson 06 in-class demo: functions\n",
    "\n",
    "## 1. Functions intro\n",
    "\n",
    "### 1.1. Defining functions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "de9ac96d-1a69-40b5-8819-553e89435bde",
   "metadata": {},
   "outputs": [],
   "source": [
    "def greeting():\n",
    "    print('Hello world!')"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "6739d17e-6de6-4970-8261-d92823b6ce5a",
   "metadata": {},
   "source": [
    "## 1.2. Calling functions"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "8bc74ba9-b554-4435-9ff1-c24c9527c64d",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello world!\n"
     ]
    }
   ],
   "source": [
    "greeting()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "fcad18a7-7e87-45c9-9f11-c8793a41c807",
   "metadata": {},
   "source": [
    "## 2. Function arguments\n",
    "\n",
    "### 1.1. Single positional argument"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "6d7f423d-be16-4102-90d8-4bc0da88fb86",
   "metadata": {},
   "outputs": [],
   "source": [
    "def greet_person(name):\n",
    "    print(f'Hello {name}')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "1c827839-0ca1-46eb-95f0-4ba39d06b5e5",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello Alice\n"
     ]
    }
   ],
   "source": [
    "greet_person('Alice')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "afe93239-f93b-4d1e-a5d4-4007a37c8322",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello Bob\n"
     ]
    }
   ],
   "source": [
    "greet_person('Bob')"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "432e319a-1f63-4826-ace4-3772d62d0a4f",
   "metadata": {},
   "source": [
    "### 1.2. Multiple positional arguments"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "id": "9eb80a8a-0403-471b-b773-222165298be0",
   "metadata": {},
   "outputs": [],
   "source": [
    "def introduce(name, age):\n",
    "    print(f'My name is {name} and I am {age} years old')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "id": "63ee11ca-cd8f-4073-b199-130be5408ef7",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "My name is Laura and I am 37 years old\n"
     ]
    }
   ],
   "source": [
    "introduce('Laura', 37)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e647ae28-24e5-4874-ab67-5fe90318abbb",
   "metadata": {},
   "source": [
    "### 1.3. Keyword arguments\n",
    "\n",
    "- **Positional args** defined by order\n",
    "- **Keyword args** defined by name"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "id": "f1824c88-1b90-4c62-adec-799cca75bacd",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "My name is Carol and I am 30 years old\n"
     ]
    }
   ],
   "source": [
    "introduce(age=30, name='Carol')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "id": "e4da32a5-14b9-4148-aebe-c69a5f81f97c",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "My name is Carol and I am 30 years old\n"
     ]
    }
   ],
   "source": [
    "introduce(name='Carol', age=30)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "6f750f6f-2df5-41ac-b214-940b139ef426",
   "metadata": {},
   "source": [
    "## 2.3. Arbitrary arguments"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "id": "f37f28c4-9a34-424f-9cf0-c72f430be72e",
   "metadata": {},
   "outputs": [],
   "source": [
    "def add_numbers(*args):\n",
    "    \n",
    "    total = 0\n",
    "    \n",
    "    for num in args:\n",
    "        total += num\n",
    "    \n",
    "    return total"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "id": "eecba6b8-2c03-4410-8cd8-5855d53d664a",
   "metadata": {},
   "outputs": [],
   "source": [
    "result = add_numbers(1,2,3,4,5,6)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "id": "6c67fdfd-7892-4014-9742-6bf36fb08e66",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "21\n"
     ]
    }
   ],
   "source": [
    "print(result)"
   ]
  }
 ],
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