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    "# Introduction to Python\n",
    "\n",
    "Welcome to the course notebook.\n",
    "\n",
    "In this lesson you will learn:\n",
    "\n",
    "- Variables\n",
    "- Loops\n",
    "- Functions\n",
    "- Basic problem solving\n",
    "\n",
    "Run each code cell and experiment with the examples."
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    "name = \"Alice\"\n",
    "age = 21\n",
    "\n",
    "print(f\"Hello {name}, you are {age} years old.\")"
   ]
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   "cell_type": "markdown",
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   "source": [
    "## Loops\n",
    "\n",
    "Loops allow us to repeat actions."
   ]
  },
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   "source": [
    "for i in range(5):\n",
    "    print(f\"Iteration {i}\")"
   ]
  },
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    "## Functions\n",
    "\n",
    "Functions help organize code into reusable blocks."
   ]
  },
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   "source": [
    "def square(x):\n",
    "    return x * x\n",
    "\n",
    "square(5)"
   ]
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    "## Exercise\n",
    "\n",
    "Create a function called `cube(x)` that returns the cube of a number.\n",
    "\n",
    "Test it with:\n",
    "\n",
    "```python\n",
    "cube(3)\n",
    "```\n",
    "\n",
    "Expected result:\n",
    "27"
   ]
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   "id": "06d41b40-c13c-483d-b12e-403fde15d1c8",
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   "source": [
    "def cube(x):\n",
    "    return x ** 3\n",
    "\n",
    "cube(3)"
   ]
  }
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