What are functions.ipynb

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      "aaahh\n",
      "aaahhhh 2\n",
      "outside function None\n"
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   "source": [
    "# a collection of instructions\n",
    "# a collection of code\n",
    "def function1():\n",
    "    print(\"aaahh\")\n",
    "    print(\"aaahhhh 2\")\n",
    "print(\"outside function\")\n"
   ]
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      "aaahh\n",
      "aaahhhh 2\n"
     ]
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   "source": [
    "function1()"
   ]
  },
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   "source": [
    "# a mapping\n",
    "def function2(x):\n",
    "    return 2*x"
   ]
  },
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   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
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     "text": [
      "6\n"
     ]
    }
   ],
   "source": [
    "a = function2(3)\n",
    "print(a)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
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     "text": [
      "8\n"
     ]
    }
   ],
   "source": [
    "b = function2(4)\n",
    "print(b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "10\n"
     ]
    }
   ],
   "source": [
    "c = function2(5)\n",
    "print(c)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "function2() missing 1 required positional argument: 'x'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-13-7ee9f5eb1f74>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0ma\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mfunction2\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m: function2() missing 1 required positional argument: 'x'"
     ]
    }
   ],
   "source": [
    "a = function2()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [],
   "source": [
    "def function3(x, y):\n",
    "    return x + y"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3\n"
     ]
    }
   ],
   "source": [
    "e = function3(1,2)\n",
    "print(e)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "16.0\n"
     ]
    }
   ],
   "source": [
    "def convert(miles):\n",
    "    return miles * 1.6\n",
    "km = convert(10)\n",
    "print(km)"
   ]
  }
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