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   "source": [
    "#### Functions Examples\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Example 1: Temperature Conversion"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "77.0\n",
      "25.0\n"
     ]
    }
   ],
   "source": [
    "def convert_temperature(temp,unit):\n",
    "    \"\"\"This function converts temperature between Celsius and Fahrenheit\"\"\"\n",
    "    if unit=='C':\n",
    "        return temp * 9/5 + 32  ## Celsius To Fahrenheit\n",
    "    elif unit==\"F\":\n",
    "        return (temp-32)*5/9 ## Fahrenheit to celsius\n",
    "    else:\n",
    "        return None\n",
    "\n",
    "print(convert_temperature(25,'C'))\n",
    "print(convert_temperature(77,'F'))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "##### Example 2: Password Strength Checker"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "False\n",
      "True\n"
     ]
    }
   ],
   "source": [
    "def is_strong_password(password):\n",
    "    \"\"\"This function checks if the password is strong or not\"\"\"\n",
    "    if len(password)<8:\n",
    "        return False\n",
    "    if not any(char.isdigit() for char in password):\n",
    "        return False\n",
    "    if not any(char.islower() for char in password):\n",
    "        return False\n",
    "    if not any(char.isupper() for char in password):\n",
    "        return False\n",
    "    if not any(char in '!@#$%^&*()_+' for char in password):\n",
    "        return False\n",
    "    return True\n",
    "\n",
    "## calling the function\n",
    "print(is_strong_password(\"WeakPwd\"))\n",
    "print(is_strong_password(\"Str0ngPwd!\"))\n",
    "    \n",
    "    "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "##### Example 3: Calculate the Total Cost Of Items In a Shopping Cart"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "5.8999999999999995\n"
     ]
    }
   ],
   "source": [
    "def calculate_total_cost(cart):\n",
    "    total_cost=0\n",
    "    for item in cart:\n",
    "        total_cost+=item['price']* item['quantity']\n",
    "\n",
    "    return total_cost\n",
    "\n",
    "\n",
    "## Example cart data\n",
    "\n",
    "cart=[\n",
    "    {'name':'Apple','price':0.5,'quantity':4},\n",
    "    {'name':'Banana','price':0.3,'quantity':6},\n",
    "    {'name':'Orange','price':0.7,'quantity':3}\n",
    "\n",
    "]\n",
    "\n",
    "## calling the function\n",
    "total_cost=calculate_total_cost(cart)\n",
    "print(total_cost)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "##### Example 4: Check IF a String Is Palindrome"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n",
      "False\n"
     ]
    }
   ],
   "source": [
    "def is_palindrome(s):\n",
    "    s=s.lower().replace(\" \",\"\")\n",
    "    return s==s[::-1]\n",
    "\n",
    "print(is_palindrome(\"A man a plan a canal Panama\"))\n",
    "print(is_palindrome(\"Hello\"))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "##### Example 5: Calculate the factorials of a number using recursion"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "720\n"
     ]
    }
   ],
   "source": [
    "def factorial(n):\n",
    "    if n==0:\n",
    "        return 1\n",
    "    else:\n",
    "        return n * factorial(n-1)\n",
    "    \n",
    "print(factorial(6))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "##### Example 6: A Function To Read A File and count the frequency of each word"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'hello': 1, 'world': 1, 'how': 1, 'are': 1, 'you': 1, 'my': 1, 'name': 1, 'is': 1, 'krish': 2}\n"
     ]
    }
   ],
   "source": [
    "def count_word_frequency(file_path):\n",
    "    word_count={}\n",
    "    with open(file_path,'r') as file:\n",
    "        for line in file:\n",
    "            words=line.split()\n",
    "            for word in words:\n",
    "                word=word.lower().strip('.,!?;:\"\\'')\n",
    "                word_count[word]=word_count.get(word,0)+1\n",
    "    \n",
    "    return word_count\n",
    "\n",
    "filepath='sample.txt'\n",
    "word_frequency=count_word_frequency(filepath)\n",
    "print(word_frequency)\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "##### Example 7: Validate Email Address"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n",
      "False\n"
     ]
    }
   ],
   "source": [
    "import re\n",
    "\n",
    "# Email validation function\n",
    "def is_valid_email(email):\n",
    "    \"\"\"This function checks if the email is valid.\"\"\"\n",
    "    pattern = r'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\\.[a-zA-Z0-9-.]+$'\n",
    "    return re.match(pattern, email) is not None\n",
    "\n",
    "# Calling the function\n",
    "print(is_valid_email(\"test@example.com\"))  # Output: True\n",
    "print(is_valid_email(\"invalid-email\"))  # Output: False\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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