functions (22_06_2019).ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#function (a piece of code) is just like a robot which performs a particular task and none other. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "#defining a function\n",
    "\n",
    "def abc(): #where abc is the name of the function (robot)\n",
    "    x = 5 + 6\n",
    "    print(x)\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "11\n"
     ]
    }
   ],
   "source": [
    "#calling a funtion\n",
    "\n",
    "abc()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "def abc():\n",
    "    x = 5 + 6\n",
    "    print(x)\n",
    "    print('function executed')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "11\n",
      "function executed end\n"
     ]
    }
   ],
   "source": [
    "abc()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "def p_abc(a): #where a is the perimeter defined within the round braces of the function\n",
    "    print(a)\n",
    "    \n",
    "#number of perimeters (while defining the function) and arguments (while calling the function) should be same"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "5\n"
     ]
    }
   ],
   "source": [
    "p_abc(5) #where '5' is the argument\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [],
   "source": [
    "def summ(num1 , num2):\n",
    "    final_value = num2 + num2\n",
    "    print(final_value)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "20\n"
     ]
    }
   ],
   "source": [
    "summ(8, 10)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Please enter first number: 1\n",
      "Please enter second number: 2\n"
     ]
    }
   ],
   "source": [
    "def summ(number1 = input('Please enter first number: ') , number2 = input('Please enter second number: ') ):\n",
    "    total = number1 + number2\n",
    "    print(total)\n",
    "\n",
    "#not the right function\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2143\n"
     ]
    }
   ],
   "source": [
    "summ(number1 , number2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "metadata": {},
   "outputs": [],
   "source": [
    "def calc(num1 , num2 , opt):\n",
    "    if opt == '+':\n",
    "        print(num1 + num2)\n",
    "    elif opt == '-':\n",
    "        print(num1 - num2)\n",
    "    elif opt == '*':\n",
    "        print(num1 * num2)\n",
    "    elif opt == '/':\n",
    "        print(num1 / num2)\n",
    "    else:\n",
    "        print('invalid number')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "13\n"
     ]
    }
   ],
   "source": [
    "calc(5 , 8 , '+')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "20\n"
     ]
    }
   ],
   "source": [
    "calc(10 , 2 , '*')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "metadata": {},
   "outputs": [],
   "source": [
    "def friends_list(friends):\n",
    "    for friend in friends:\n",
    "        print(friend)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Ibrahim\n",
      "Junaid\n",
      "Ali\n"
     ]
    }
   ],
   "source": [
    "my_friends = ['Ibrahim' , 'Junaid' , 'Ali']\n",
    "friends_list(my_friends)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "P\n",
      "a\n",
      "k\n",
      "i\n",
      "s\n",
      "t\n",
      "a\n",
      "n\n",
      " \n",
      "Z\n",
      "i\n",
      "n\n",
      "d\n",
      "a\n",
      "b\n",
      "a\n",
      "d\n"
     ]
    }
   ],
   "source": [
    "x = 'Pakistan Zindabad'\n",
    "friends_list(x)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Task no 2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 60,
   "metadata": {},
   "outputs": [],
   "source": [
    "def members_list(members , empty):\n",
    "    for member in members:\n",
    "        empty.append = members.pop()\n",
    "    print(empty_list)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 62,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "ename": "AttributeError",
     "evalue": "'list' object attribute 'append' is read-only",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mAttributeError\u001b[0m                            Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-62-814940cc6c26>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[0mtotalmembers_list\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;34m'Ali'\u001b[0m \u001b[1;33m,\u001b[0m \u001b[1;34m'Ahmed'\u001b[0m \u001b[1;33m,\u001b[0m \u001b[1;34m'Abdullah'\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      2\u001b[0m \u001b[0mempty\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[0mmembers_list\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mtotalmembers_list\u001b[0m \u001b[1;33m,\u001b[0m \u001b[0mempty\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;32m<ipython-input-60-1cc6e2a6e663>\u001b[0m in \u001b[0;36mmembers_list\u001b[1;34m(members, empty)\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mmembers_list\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mmembers\u001b[0m \u001b[1;33m,\u001b[0m \u001b[0mempty\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      2\u001b[0m     \u001b[1;32mfor\u001b[0m \u001b[0mmember\u001b[0m \u001b[1;32min\u001b[0m \u001b[0mmembers\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m         \u001b[0mempty\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mappend\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mmembers\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mpop\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      4\u001b[0m     \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mempty_list\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mAttributeError\u001b[0m: 'list' object attribute 'append' is read-only"
     ]
    }
   ],
   "source": [
    "totalmembers_list = ['Ali' , 'Ahmed' , 'Abdullah']\n",
    "empty = []\n",
    "members_list(totalmembers_list , empty)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 63,
   "metadata": {},
   "outputs": [],
   "source": [
    "def append_list(list_1 , list_2):\n",
    "    for l in list_1:\n",
    "        list_2.append(l)\n",
    "    for l_2 in list_2:\n",
    "        print(l_2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 65,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1\n",
      "2\n",
      "3\n",
      "4\n"
     ]
    }
   ],
   "source": [
    "append_list([1 , 2 , 3, 4] , [])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 66,
   "metadata": {},
   "outputs": [],
   "source": [
    "def my_name(firstname , lastname):\n",
    "    print(firstname + ' ' + lastname)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 67,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Taimur Shahzad\n"
     ]
    }
   ],
   "source": [
    "my_name('Taimur' , 'Shahzad')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 68,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Shahzad Taimur\n"
     ]
    }
   ],
   "source": [
    "my_name('Shahzad' , 'Taimur') #logical error"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 73,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Taimur Shahzad\n"
     ]
    }
   ],
   "source": [
    "my_name(lastname = 'Shahzad', firstname = 'Taimur') #keyword  argument"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 74,
   "metadata": {},
   "outputs": [],
   "source": [
    "def me_and_father(myname , fathername):\n",
    "    print('My name is ' + myname)\n",
    "    print(\"My father's name is \" + fathername)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 75,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "My name is Taimur\n",
      "My father's name is Shahzad\n"
     ]
    }
   ],
   "source": [
    "me_and_father(fathername = 'Shahzad' , myname = 'Taimur')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 77,
   "metadata": {},
   "outputs": [],
   "source": [
    "def make_juice(a , b , c):\n",
    "    print(a)\n",
    "    print(b)\n",
    "    print(c)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 78,
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "positional argument follows keyword argument (<ipython-input-78-a48e29461208>, line 1)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-78-a48e29461208>\"\u001b[1;36m, line \u001b[1;32m1\u001b[0m\n\u001b[1;33m    make_juice(c = 'sugar' , 10 , 'banana')\u001b[0m\n\u001b[1;37m                            ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m positional argument follows keyword argument\n"
     ]
    }
   ],
   "source": [
    "make_juice(c = 'sugar' , 10 , 'banana')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 79,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "10\n",
      "banana\n",
      "sugar\n"
     ]
    }
   ],
   "source": [
    "#all positional arguments should be defined before keyword arguuments\n",
    "make_juice(10 , 'banana' , c = 'sugar')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 80,
   "metadata": {},
   "outputs": [],
   "source": [
    "#order of keyword arguments doesnt matter , b can be defined before c\n",
    "def make_juice(a, b, c, d):\n",
    "    print(a)\n",
    "    print(b)\n",
    "    print(c)\n",
    "    print(d)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 81,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "10\n",
      "banana\n",
      "sugar\n",
      "flavor\n"
     ]
    }
   ],
   "source": [
    "make_juice(10, 'banana' , d='flavor' , c='sugar')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 82,
   "metadata": {},
   "outputs": [],
   "source": [
    "def my_full_name(firstname , midname , lastname):\n",
    "    print(firstname + ' ' + midname + ' ' + lastname)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 83,
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "my_full_name() missing 1 required positional argument: 'lastname'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-83-d116d23d091d>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mmy_full_name\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'Taimur'\u001b[0m \u001b[1;33m,\u001b[0m \u001b[1;34m'Shahzad'\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: my_full_name() missing 1 required positional argument: 'lastname'"
     ]
    }
   ],
   "source": [
    "my_full_name('Taimur' , 'Shahzad')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 84,
   "metadata": {},
   "outputs": [],
   "source": [
    "def my_full_name(firstname , lastname , midname = ' '):\n",
    "    if midname != ' ':\n",
    "        print(firstname + ' ' + midname + ' ' + lastname)\n",
    "    else:\n",
    "        print(firstname + ' ' + lastname)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 85,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Taimur Shahzad Gill\n"
     ]
    }
   ],
   "source": [
    "my_full_name('Taimur' , 'Gill' , midname = 'Shahzad')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 86,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Taimur Gill\n"
     ]
    }
   ],
   "source": [
    "my_full_name('Taimur', 'Gill')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Enter the table number2\n",
      "2 * 1 = 2\n",
      "2 * 2 = 4\n",
      "2 * 3 = 6\n",
      "2 * 4 = 8\n",
      "2 * 5 = 10\n",
      "2 * 6 = 12\n",
      "2 * 7 = 14\n",
      "2 * 8 = 16\n",
      "2 * 9 = 18\n",
      "2 * 10 = 20\n"
     ]
    }
   ],
   "source": [
    "tableNo = int(input(\"Enter the table number\"))\n",
    "\n",
    "for num in range(1,11):\n",
    "    print(f\"{tableNo} * {num} = {tableNo*num}\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 87,
   "metadata": {},
   "outputs": [],
   "source": [
    "def dis_calc(val):\n",
    "    if val > 100:\n",
    "        dis_val = val - 5\n",
    "        print(dis_val)\n",
    "    else :\n",
    "        print(val)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 88,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "100\n"
     ]
    }
   ],
   "source": [
    "dis_calc(105)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 91,
   "metadata": {},
   "outputs": [],
   "source": [
    "#using value generated in a function \n",
    "def f_ret(a):\n",
    "    return a + 10\n",
    "    print('hello return') #no other task can be performed after return statement in the body of the function"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 93,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "53\n"
     ]
    }
   ],
   "source": [
    "x = f_ret(43)\n",
    "print(x)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 94,
   "metadata": {},
   "outputs": [],
   "source": [
    "def dis_calc(val):\n",
    "    if val > 100:\n",
    "        dis_val = val - 5\n",
    "        return dis_val\n",
    "    else:\n",
    "        return val #only one return statement runs at a time"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 98,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Your bill is 107\n"
     ]
    }
   ],
   "source": [
    "bill = dis_calc(112)\n",
    "print('Your bill is' , bill)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Task no. 3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "def fullnames_list(firstnames_list , lastname):\n",
    "    fullname = firstnames.pop() + 'Khan'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<function __main__.fullnames_list(firstnames_list, lastname)>"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fullnames_list"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "def firstname(firstname):\n",
    "    for khan in firstname:\n",
    "        print(khan + ' Khan')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "'list' object is not callable",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-7-ace52739ac72>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[0mfirstname\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m\u001b[1;34m'Ibrahim'\u001b[0m \u001b[1;33m,\u001b[0m \u001b[1;34m'Junaid'\u001b[0m \u001b[1;33m,\u001b[0m \u001b[1;34m'Ali'\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[0mfirstname\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mfirstname\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: 'list' object is not callable"
     ]
    }
   ],
   "source": [
    "firstname = ['Ibrahim' , 'Junaid' , 'Ali']\n",
    "firstname(firstname)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.7.3"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}