Python Assignment-3.ipynb

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 "cells": [
  {
   "cell_type": "markdown",
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   "source": [
    "# Q.Program in Python for Opening a File and Writing \" I Love LetsUpgrade\" And close it, and read it back again, and then append some data to it and close it."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "file = open('Myfile.txt','w')\n",
    "file.write(\"I Love LetsUpgrade.\")\n",
    "file.close()\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "file = open('Myfile.txt','r')\n",
    "read_the_file= file.read()\n",
    "file.close()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'I Love LetsUpgrade.'"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "read_the_file"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "file = open('Myfile.txt','a')\n",
    "file.write('Letsupgrade is the best platform for developers')\n",
    "file.close()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Q.Function which can return a Factorial of any numbers as INT, given in the argument."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "def factorial(num):\n",
    "    if(num==1):\n",
    "        return 1\n",
    "    s= num*factorial(num-1)\n",
    "    return s;"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "120"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "factorial(5)"
   ]
  }
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