update with literals info

README.md

@@ -587,6 +587,7 @@ Vector pickled in data/vector.pkl!
 - [Dataclasses](https://realpython.com/python-data-classes/#basic-data-classes): a concise syntax for classes containing mainly data, similar to structures in C. The library [Pydantic](https://docs.pydantic.dev/latest/) implements automatic type checking when initializing a dataclass.
 - [Pre-commits](https://pre-commit.com/): pre-commit hooks allow us to do certain actions before commiting changes with git. For example, we can lint our code with Ruff and fix it with Black whenever we make a commit. 
 - [Logging](https://realpython.com/python-logging/): keep a record of what is happening in your program.
+- [Literals, keywords and builtins](http://python-history.blogspot.com/2013/11/story-of-none-true-false.html)
 
 
 ## Online resources

examples/work in progress/10-pytho-internals.ipynb

@@ -273,12 +273,31 @@
     "\"a\" = 3"
    ]
   },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "One cannot overrride keywords (reserved words)"
+   ]
+  },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {},
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "ename": "SyntaxError",
+     "evalue": "invalid syntax (4048098288.py, line 1)",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;36m  Cell \u001b[0;32mIn[1], line 1\u001b[0;36m\u001b[0m\n\u001b[0;31m    if = 2\u001b[0m\n\u001b[0m       ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m invalid syntax\n"
+     ]
+    }
+   ],
+   "source": [
+    "if = 2"
+   ]
   }
  ],
  "metadata": {