variables.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Variables"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Variables are containers or memory locations used to store value. Variables values can be changed. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World!\n"
     ]
    }
   ],
   "source": [
    "print(\"Hello World!\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello World!\n"
     ]
    }
   ],
   "source": [
    "welcome_msg = \"Hello World!\"\n",
    "print(welcome_msg)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Welcome! Asad Raza\n"
     ]
    }
   ],
   "source": [
    "msg = \"Welcome!\"\n",
    "name = \"Asad Raza\"\n",
    "print(msg+\" \"+name)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "John age is 20\n"
     ]
    }
   ],
   "source": [
    "age = 20\n",
    "print(\"John age is \"+str(age))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Price of Pize: 5.75\n"
     ]
    }
   ],
   "source": [
    "price = 5.75\n",
    "print(\"Price of Pize: \"+str(price))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "1.\tVariables can only start with alphabet or underscore\n",
    "2.  Variables names can contain alphabet(a-z) and numbers(0-9)\n",
    "2.\tVariables name can not contain any space\n",
    "3.\tKeywords cannot be declared as variables\n",
    "4.\tVariables names can not contain any special character except underscore"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Correct declared variables"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "metadata": {},
   "outputs": [],
   "source": [
    "name = \"John\"\n",
    "weight = 60\n",
    "name1 = \"John\"\n",
    "last_name = \"davy\"\n",
    "_last_name = \"davy\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Wrong declared variables"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "1name = \"John\"\n",
    "weight* = 60\n",
    "last-name = \"davy\""
   ]
  }
 ],
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   "file_extension": ".py",
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