What are Functions .ipynb

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   "cell_type": "code",
   "execution_count": 1,
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     "text": [
      "this is outside the function\n"
     ]
    }
   ],
   "source": [
    "# af function is a collection of intructions\n",
    "# a collection of code \n",
    "# a comment always start with a pound symbol #\n",
    "def function1():\n",
    "    print (\"ahhhhh\")\n",
    "    print (\"ahhhh2\")\n",
    "    print(\"life is good\")\n",
    "print (\"this is outside the function\")\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "ahhhhh\n",
      "ahhhh2\n",
      "life is good\n"
     ]
    }
   ],
   "source": [
    "function1()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "ahhhhh\n",
      "ahhhh2\n",
      "life is good\n",
      "ahhhhh\n",
      "ahhhh2\n",
      "life is good\n",
      "ahhhhh\n",
      "ahhhh2\n",
      "life is good\n"
     ]
    }
   ],
   "source": [
    "function1()\n",
    "function1()\n",
    "function1()\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "6\n"
     ]
    }
   ],
   "source": [
    "# a mapping\n",
    "#input or an argument\n",
    "def function(y):\n",
    "    return 2*y\n",
    "a=function(3)\n",
    "#return value or output\n",
    "print(a)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "b=function(4)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "8\n"
     ]
    }
   ],
   "source": [
    "print(b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "10\n"
     ]
    }
   ],
   "source": [
    "c=function(5)\n",
    "print(c)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [],
   "source": [
    "d=function(0)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0\n"
     ]
    }
   ],
   "source": [
    "print(d)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3\n"
     ]
    }
   ],
   "source": [
    "def function2(x,y):\n",
    "    return x+y\n",
    "e=function2(1,2)\n",
    "print(e)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "4\n",
      "still in this function\n",
      "all is practices and experience\n",
      "12\n"
     ]
    }
   ],
   "source": [
    "def function3(x):\n",
    "    print(x)\n",
    "    print(\"still in this function\")\n",
    "    print(\"all is practices and experience\")\n",
    "    return 3*x\n",
    "f=function3(4)\n",
    "print(f)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [],
   "source": [
    "def function5(some_argument):\n",
    "    print(some_argument)\n",
    "    print(\"weeee\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "4\n",
      "weeee\n"
     ]
    }
   ],
   "source": [
    "function5(4)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "4\n",
      "weeee\n"
     ]
    }
   ],
   "source": [
    "m=function5(4)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "7\n",
      "weeee\n"
     ]
    }
   ],
   "source": [
    "function5(7)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3\n"
     ]
    }
   ],
   "source": [
    "print(e)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "None\n"
     ]
    }
   ],
   "source": [
    "print(m)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [],
   "source": [
    "#BMI calculation\n",
    "name1=\"YK\"\n",
    "height_m1=2\n",
    "weight_kg1=90\n",
    "\n",
    "name2=\"YK's sister\"\n",
    "height_m2=1.8\n",
    "weight_kg2=70\n",
    "\n",
    "name3=\"YK's brother\"\n",
    "height_m3=2.5\n",
    "weight_kg3=160"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "metadata": {},
   "outputs": [],
   "source": [
    "def bmi_calculator(name,height_m,weight_kg):\n",
    "    bmi=weight_kg/(height_m**2)\n",
    "    print(\"bmi: \")\n",
    "    print(bmi)\n",
    "    if bmi < 25:\n",
    "        return name + \" is not overweight\"\n",
    "    else:\n",
    "        return name + \" is overweight\"\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "bmi: \n",
      "22.5\n",
      "bmi: \n",
      "21.604938271604937\n",
      "bmi: \n",
      "25.6\n"
     ]
    }
   ],
   "source": [
    "result1 = bmi_calculator (name1,height_m1,weight_kg1)\n",
    "result2 = bmi_calculator (name2,height_m2,weight_kg2)\n",
    "result3 = bmi_calculator (name3,height_m3,weight_kg3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "YKis not overweight\n",
      "YK's sisteris not overweight\n",
      "YK's brotheris overweight\n"
     ]
    }
   ],
   "source": [
    "print(result1)\n",
    "print(result2)\n",
    "print(result3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "metadata": {},
   "outputs": [],
   "source": [
    "def convert (miles):\n",
    "    return 1.6*miles\n",
    "km=convert(10)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "16.0\n"
     ]
    }
   ],
   "source": [
    "print(km)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3.2\n"
     ]
    }
   ],
   "source": [
    "km=convert(2)\n",
    "print (km)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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