labs/Lab-2/Lab-2-Solution/01_Python_Basics_Solution.ipynb

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    "# Module 2 — Lab 1: Python Fundamentals for Security Analysis\n",
    "\n",
    "**Topics:** variables, data types, strings, type casting, operators\n",
    "\n",
    "\n",
    "> **Solution version:** This notebook contains the complete solution. Run the cells in order and compare the results with your Lab notebook.\n"
   ]
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   "source": [
    "## Learning objectives\n",
    "\n",
    "After completing this lab, you will be able to:\n",
    "\n",
    "- store security information in variables and select suitable data types;\n",
    "- normalize log strings using string methods;\n",
    "- cast values read from logs to the required data types;\n",
    "- combine comparison and logical operators to flag suspicious activity.\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "5338112e",
   "metadata": {},
   "outputs": [],
   "source": [
    "print(\"Hello, Cyber World!\")\n",
    "\n",
    "ip_address = \"198.51.100.14\"\n",
    "port_number = 443\n",
    "failed_logins = 7\n",
    "response_time = 0.125\n",
    "is_admin = False\n",
    "\n",
    "print(f\"IP: {ip_address} | Port: {port_number}\")\n",
    "print(type(ip_address), type(port_number), type(response_time), type(is_admin))\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0094841a",
   "metadata": {},
   "source": [
    "## 1. Strings in security logs\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "b5ed12a4",
   "metadata": {},
   "outputs": [],
   "source": [
    "log_message = \"  FAILED login for Admin from 198.51.100.14  \"\n",
    "url = \"https://example.com/login\"\n",
    "\n",
    "print(log_message.strip())\n",
    "print(log_message.lower())\n",
    "print(log_message.replace(\"FAILED\", \"DENIED\"))\n",
    "print(url[0:5])\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c484946c",
   "metadata": {
    "tags": [
     "exercise"
    ]
   },
   "source": [
    "## 2. Normalize a username and extract the protocol\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "c62e36d5",
   "metadata": {
    "tags": [
     "solution"
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   },
   "outputs": [],
   "source": [
    "raw_username = \"  AdMin \"\n",
    "normalized_username = raw_username.strip().lower()\n",
    "\n",
    "url = \"https://example.com/login\"\n",
    "protocol = url[0:5]\n",
    "\n",
    "print(normalized_username)\n",
    "print(protocol)\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "9f02318b",
   "metadata": {
    "tags": [
     "exercise"
    ]
   },
   "source": [
    "## 3. Type casting and operators\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "61827b28",
   "metadata": {
    "tags": [
     "solution"
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   "outputs": [],
   "source": [
    "port_text = \"8080\"\n",
    "port_number = int(port_text)\n",
    "next_port = port_number + 1\n",
    "\n",
    "login_attempts = 7\n",
    "user_ip = \"198.51.100.14\"\n",
    "is_suspicious = login_attempts > 5 and user_ip != \"127.0.0.1\"\n",
    "\n",
    "print(f\"Next port: {next_port}\")\n",
    "print(f\"Suspicious: {is_suspicious}\")\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0613c68c",
   "metadata": {
    "tags": [
     "exercise"
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   },
   "source": [
    "## 4. Calculate a basic risk score\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "fa8d9c4d",
   "metadata": {
    "tags": [
     "solution"
    ]
   },
   "outputs": [],
   "source": [
    "failed_logins = 7\n",
    "is_admin = False\n",
    "is_off_hours = True\n",
    "\n",
    "risk_score = failed_logins * 10 + int(is_admin) * 25 + int(is_off_hours) * 15\n",
    "requires_review = risk_score >= 60\n",
    "\n",
    "print(f\"Risk score: {risk_score}\")\n",
    "print(f\"Requires review: {requires_review}\")\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "285b59c6",
   "metadata": {},
   "source": [
    "## Self-check\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "3a59fbe2",
   "metadata": {},
   "outputs": [],
   "source": [
    "assert normalized_username == \"admin\"\n",
    "assert protocol == \"https\"\n",
    "assert next_port == 8081\n",
    "assert is_suspicious is True\n",
    "assert risk_score == 85\n",
    "assert requires_review is True\n",
    "print(\"✓ Lab 1 completed\")\n"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "92257020",
   "metadata": {},
   "source": [
    "## Reflection questions\n",
    "\n",
    "1. Why does `port_text + 1` fail while `int(port_text) + 1` works?\n",
    "2. What changes if you replace `and` with `or` in the `is_suspicious` condition?\n"
   ]
  }
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