Session-2-variables.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "027cd46a",
   "metadata": {},
   "outputs": [],
   "source": [
    "import os   # packag name : os\n",
    "# shift+enter at a time"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "6a4cbbad",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'C:\\\\Users\\\\omkar\\\\OneDrive\\\\Documents\\\\Data science\\\\Naresh IT\\\\Data science\\\\Batch2\\\\python_session'"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "os.getcwd()   # getcwd: get current working directory"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "3f43c88f",
   "metadata": {},
   "source": [
    "$Variables$   "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "5a8d8148",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "20"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# we can write the story : markdown mode\n",
    "# we can run the code : code mode\n",
    "a=20\n",
    "a"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "d0321358",
   "metadata": {},
   "outputs": [],
   "source": [
    "What is meant by variables?\n",
    "\n",
    "variables ======== > vary\n",
    "\n",
    "30 value in a:   a is a variable\n",
    "    \n",
    "50  in  b   :   b is a variable\n",
    "    \n",
    "100 in b    :  what is the b value : 100"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "0325ee72",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "100"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "number =100\n",
    "# here number is variable \n",
    "# the value of number is : 100\n",
    "number"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "724cb999",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "200"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "NUMBER=200\n",
    "# valid or not?\n",
    "NUMBER"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "e2804609",
   "metadata": {},
   "outputs": [],
   "source": [
    "number and NUMBER \n",
    "# variables are case sensitive"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "378b5512",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "300"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "NUMber=300\n",
    "NUMber"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "9d5ec991",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "500"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "NUMBER123=500\n",
    "NUMBER123"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "1793091a",
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "invalid decimal literal (722460016.py, line 1)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  Cell \u001b[1;32mIn [9], line 1\u001b[1;36m\u001b[0m\n\u001b[1;33m    123Number=600\u001b[0m\n\u001b[1;37m      ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid decimal literal\n"
     ]
    }
   ],
   "source": [
    "123Number=600\n",
    "123Number"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "9d6e3fd0",
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "invalid syntax (1617142845.py, line 1)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  Cell \u001b[1;32mIn [10], line 1\u001b[1;36m\u001b[0m\n\u001b[1;33m    num$er=600\u001b[0m\n\u001b[1;37m       ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
     ]
    }
   ],
   "source": [
    "num$er=600\n",
    "num$er"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "615cbf00",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "700"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "number_123=700\n",
    "number_123"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "83a75206",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "800"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "num_er=800\n",
    "num_er"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "16fa6aec",
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "cannot assign to expression here. Maybe you meant '==' instead of '='? (708406976.py, line 1)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  Cell \u001b[1;32mIn [13], line 1\u001b[1;36m\u001b[0m\n\u001b[1;33m    num@er=900\u001b[0m\n\u001b[1;37m    ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m cannot assign to expression here. Maybe you meant '==' instead of '='?\n"
     ]
    }
   ],
   "source": [
    "num@er=900\n",
    "num@er"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "2db8a964",
   "metadata": {},
   "source": [
    "- capital letters allowed\n",
    "\n",
    "- small letters are allowed\n",
    "\n",
    "- combination of capital letters and small letters are allowed\n",
    "\n",
    "- letter with numbers as suffix (lettrs+numbers)(cash123) is allowed\n",
    "\n",
    "- number with letters (123cash) is not allowed\n",
    "\n",
    "- spl characters are not allowed except underscore"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "49fb8a43",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "500"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "_=500\n",
    "_"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "id": "979dd566",
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "invalid syntax (433902655.py, line 1)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  Cell \u001b[1;32mIn [15], line 1\u001b[1;36m\u001b[0m\n\u001b[1;33m    if =1000\u001b[0m\n\u001b[1;37m       ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
     ]
    }
   ],
   "source": [
    "if =1000\n",
    "if"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "d337e48f",
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "invalid syntax (1641130174.py, line 1)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  Cell \u001b[1;32mIn [16], line 1\u001b[1;36m\u001b[0m\n\u001b[1;33m    for = 2000\u001b[0m\n\u001b[1;37m        ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
     ]
    }
   ],
   "source": [
    "for = 2000\n",
    "for"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "77a44541",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "5000"
      ]
     },
     "execution_count": 17,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "sum = 5000\n",
    "sum"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "b66d7c23",
   "metadata": {},
   "outputs": [],
   "source": [
    "# green colour  keywords\n",
    "if  for while else "
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8ba9fab5",
   "metadata": {},
   "source": [
    "- capital letters allowed\n",
    "\n",
    "- small letters are allowed\n",
    "\n",
    "- combination of capital letters and small letters are allowed\n",
    "\n",
    "- letter with numbers as suffix (lettrs+numbers)(cash123) is allowed\n",
    "\n",
    "- number with letters (123cash) is not allowed\n",
    "\n",
    "- spl characters are not allowed except underscore\n",
    "\n",
    "- keywords are not allowed"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "64c7b7e1",
   "metadata": {},
   "outputs": [],
   "source": [
    "# To know how many keywords are there in python\n",
    "# package_name: keyword"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "19ff3a03",
   "metadata": {},
   "outputs": [],
   "source": [
    "abhilash sumation of two numbers\n",
    "name: addition\n",
    "    \n",
    "addition ============ python organization\n",
    "\n",
    "anyone install your python : my addition also install\n",
    "    \n",
    "addition: package\n",
    "    \n",
    "he created a sub tasks inside\n",
    "\n",
    "1. addition\n",
    "\n",
    "2. mutiplication\n",
    "\n",
    "3. subtraction"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "id": "2fc09f78",
   "metadata": {},
   "outputs": [],
   "source": [
    "#package name: os\n",
    "\n",
    "import os"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "id": "fee55603",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['DirEntry',\n",
       " 'F_OK',\n",
       " 'GenericAlias',\n",
       " 'Mapping',\n",
       " 'MutableMapping',\n",
       " 'O_APPEND',\n",
       " 'O_BINARY',\n",
       " 'O_CREAT',\n",
       " 'O_EXCL',\n",
       " 'O_NOINHERIT',\n",
       " 'O_RANDOM',\n",
       " 'O_RDONLY',\n",
       " 'O_RDWR',\n",
       " 'O_SEQUENTIAL',\n",
       " 'O_SHORT_LIVED',\n",
       " 'O_TEMPORARY',\n",
       " 'O_TEXT',\n",
       " 'O_TRUNC',\n",
       " 'O_WRONLY',\n",
       " 'P_DETACH',\n",
       " 'P_NOWAIT',\n",
       " 'P_NOWAITO',\n",
       " 'P_OVERLAY',\n",
       " 'P_WAIT',\n",
       " 'PathLike',\n",
       " 'R_OK',\n",
       " 'SEEK_CUR',\n",
       " 'SEEK_END',\n",
       " 'SEEK_SET',\n",
       " 'TMP_MAX',\n",
       " 'W_OK',\n",
       " 'X_OK',\n",
       " '_AddedDllDirectory',\n",
       " '_Environ',\n",
       " '__all__',\n",
       " '__builtins__',\n",
       " '__cached__',\n",
       " '__doc__',\n",
       " '__file__',\n",
       " '__loader__',\n",
       " '__name__',\n",
       " '__package__',\n",
       " '__spec__',\n",
       " '_check_methods',\n",
       " '_execvpe',\n",
       " '_exists',\n",
       " '_exit',\n",
       " '_fspath',\n",
       " '_get_exports_list',\n",
       " '_walk',\n",
       " '_wrap_close',\n",
       " 'abc',\n",
       " 'abort',\n",
       " 'access',\n",
       " 'add_dll_directory',\n",
       " 'altsep',\n",
       " 'chdir',\n",
       " 'chmod',\n",
       " 'close',\n",
       " 'closerange',\n",
       " 'cpu_count',\n",
       " 'curdir',\n",
       " 'defpath',\n",
       " 'device_encoding',\n",
       " 'devnull',\n",
       " 'dup',\n",
       " 'dup2',\n",
       " 'environ',\n",
       " 'error',\n",
       " 'execl',\n",
       " 'execle',\n",
       " 'execlp',\n",
       " 'execlpe',\n",
       " 'execv',\n",
       " 'execve',\n",
       " 'execvp',\n",
       " 'execvpe',\n",
       " 'extsep',\n",
       " 'fdopen',\n",
       " 'fsdecode',\n",
       " 'fsencode',\n",
       " 'fspath',\n",
       " 'fstat',\n",
       " 'fsync',\n",
       " 'ftruncate',\n",
       " 'get_exec_path',\n",
       " 'get_handle_inheritable',\n",
       " 'get_inheritable',\n",
       " 'get_terminal_size',\n",
       " 'getcwd',\n",
       " 'getcwdb',\n",
       " 'getenv',\n",
       " 'getlogin',\n",
       " 'getpid',\n",
       " 'getppid',\n",
       " 'isatty',\n",
       " 'kill',\n",
       " 'linesep',\n",
       " 'link',\n",
       " 'listdir',\n",
       " 'lseek',\n",
       " 'lstat',\n",
       " 'makedirs',\n",
       " 'mkdir',\n",
       " 'name',\n",
       " 'open',\n",
       " 'pardir',\n",
       " 'path',\n",
       " 'pathsep',\n",
       " 'pipe',\n",
       " 'popen',\n",
       " 'putenv',\n",
       " 'read',\n",
       " 'readlink',\n",
       " 'remove',\n",
       " 'removedirs',\n",
       " 'rename',\n",
       " 'renames',\n",
       " 'replace',\n",
       " 'rmdir',\n",
       " 'scandir',\n",
       " 'sep',\n",
       " 'set_handle_inheritable',\n",
       " 'set_inheritable',\n",
       " 'spawnl',\n",
       " 'spawnle',\n",
       " 'spawnv',\n",
       " 'spawnve',\n",
       " 'st',\n",
       " 'startfile',\n",
       " 'stat',\n",
       " 'stat_result',\n",
       " 'statvfs_result',\n",
       " 'strerror',\n",
       " 'supports_bytes_environ',\n",
       " 'supports_dir_fd',\n",
       " 'supports_effective_ids',\n",
       " 'supports_fd',\n",
       " 'supports_follow_symlinks',\n",
       " 'symlink',\n",
       " 'sys',\n",
       " 'system',\n",
       " 'terminal_size',\n",
       " 'times',\n",
       " 'times_result',\n",
       " 'truncate',\n",
       " 'umask',\n",
       " 'uname_result',\n",
       " 'unlink',\n",
       " 'unsetenv',\n",
       " 'urandom',\n",
       " 'utime',\n",
       " 'waitpid',\n",
       " 'waitstatus_to_exitcode',\n",
       " 'walk',\n",
       " 'write']"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dir(os)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "id": "a138d5bf",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'C:\\\\Users\\\\omkar\\\\OneDrive\\\\Documents\\\\Data science\\\\Naresh IT\\\\Data science\\\\Batch2\\\\python_session'"
      ]
     },
     "execution_count": 20,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "os.getcwd()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "id": "f41a6b78",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on built-in function getcwd in module nt:\n",
      "\n",
      "getcwd()\n",
      "    Return a unicode string representing the current working directory.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "# step-1: import the pcakage\n",
    "import os\n",
    "# step-2: what are the methods/functions this package have\n",
    "dir(os)\n",
    "\n",
    "# step-3: you choose one method (getcwd)\n",
    "help(os.getcwd)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "id": "73bebdfc",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'C:\\\\Users\\\\omkar\\\\OneDrive\\\\Documents\\\\Data science\\\\Naresh IT\\\\Data science\\\\Batch2\\\\python_session'"
      ]
     },
     "execution_count": 22,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "os.getcwd()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "fdfe4275",
   "metadata": {},
   "outputs": [],
   "source": [
    "import os\n",
    "dir(os)\n",
    "help(os.getcwd)\n",
    "os.getcwd()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "id": "a0c78d21",
   "metadata": {},
   "outputs": [],
   "source": [
    "# now i want to get a random integer number between 1 to 20\n",
    "# package name: random\n",
    "import random"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "id": "b8578cc4",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['BPF',\n",
       " 'LOG4',\n",
       " 'NV_MAGICCONST',\n",
       " 'RECIP_BPF',\n",
       " 'Random',\n",
       " 'SG_MAGICCONST',\n",
       " 'SystemRandom',\n",
       " 'TWOPI',\n",
       " '_ONE',\n",
       " '_Sequence',\n",
       " '_Set',\n",
       " '__all__',\n",
       " '__builtins__',\n",
       " '__cached__',\n",
       " '__doc__',\n",
       " '__file__',\n",
       " '__loader__',\n",
       " '__name__',\n",
       " '__package__',\n",
       " '__spec__',\n",
       " '_accumulate',\n",
       " '_acos',\n",
       " '_bisect',\n",
       " '_ceil',\n",
       " '_cos',\n",
       " '_e',\n",
       " '_exp',\n",
       " '_floor',\n",
       " '_index',\n",
       " '_inst',\n",
       " '_isfinite',\n",
       " '_log',\n",
       " '_os',\n",
       " '_pi',\n",
       " '_random',\n",
       " '_repeat',\n",
       " '_sha512',\n",
       " '_sin',\n",
       " '_sqrt',\n",
       " '_test',\n",
       " '_test_generator',\n",
       " '_urandom',\n",
       " '_warn',\n",
       " 'betavariate',\n",
       " 'choice',\n",
       " 'choices',\n",
       " 'expovariate',\n",
       " 'gammavariate',\n",
       " 'gauss',\n",
       " 'getrandbits',\n",
       " 'getstate',\n",
       " 'lognormvariate',\n",
       " 'normalvariate',\n",
       " 'paretovariate',\n",
       " 'randbytes',\n",
       " 'randint',\n",
       " 'random',\n",
       " 'randrange',\n",
       " 'sample',\n",
       " 'seed',\n",
       " 'setstate',\n",
       " 'shuffle',\n",
       " 'triangular',\n",
       " 'uniform',\n",
       " 'vonmisesvariate',\n",
       " 'weibullvariate']"
      ]
     },
     "execution_count": 24,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dir(random)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "id": "226cbf6f",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on method randint in module random:\n",
      "\n",
      "randint(a, b) method of random.Random instance\n",
      "    Return random integer in range [a, b], including both end points.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(random.randint)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "id": "346afcb1",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "10"
      ]
     },
     "execution_count": 29,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "random.randint(1,20)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ec09215f",
   "metadata": {},
   "outputs": [],
   "source": [
    "import random\n",
    "dir(random)\n",
    "help(random.randint)\n",
    "random.randint(1,20)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "adbf3ca3",
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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