Launching refreshed version of LLM Engineering weeks 1-4 - see README

guides/06_python_foundations.ipynb

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+    "# Foundations of Python and fixing NameErrors\n",
+    "\n",
+    "## First, for a complete beginner\n",
+    "\n",
+    "This introductory tutorial gets you started with the basics.\n",
+    "\n",
+    "https://chatgpt.com/share/68063082-c2d8-8012-8d45-fa674aa1c1ed\n"
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+    "## Next: a comprehensive briefing on Python\n",
+    "\n",
+    "I'm going to defer to an AI friend for this, because these explanations are so well written with great examples. Copy and paste the code examples into a new cell to give them a try. Pick whichever section(s) you'd like to brush up on.\n",
+    "\n",
+    "**Python imports:**  \n",
+    "https://chatgpt.com/share/672f9f31-8114-8012-be09-29ef0d0140fb\n",
+    "\n",
+    "**Python functions** including default arguments:  \n",
+    "https://chatgpt.com/share/672f9f99-7060-8012-bfec-46d4cf77d672\n",
+    "\n",
+    "**Python strings**, including slicing, split/join, replace and literals:  \n",
+    "https://chatgpt.com/share/672fb526-0aa0-8012-9e00-ad1687c04518\n",
+    "\n",
+    "**Python f-strings** including number and date formatting:  \n",
+    "https://chatgpt.com/share/672fa125-0de0-8012-8e35-27918cbb481c\n",
+    "\n",
+    "**Python lists, dicts and sets**, including the `get()` method:  \n",
+    "https://chatgpt.com/share/672fa225-3f04-8012-91af-f9c95287da8d\n",
+    "\n",
+    "**Python files** including modes, encoding, context managers, Path, glob.glob:  \n",
+    "https://chatgpt.com/share/673b53b2-6d5c-8012-a344-221056c2f960\n",
+    "\n",
+    "**Python classes:**  \n",
+    "https://chatgpt.com/share/672fa07a-1014-8012-b2ea-6dc679552715\n",
+    "\n",
+    "**Pickling Python objects and converting to JSON:**  \n",
+    "https://chatgpt.com/share/673b553e-9d0c-8012-9919-f3bb5aa23e31"
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+   "source": [
+    "## With this in mind - understanding NameErrors in Python\n",
+    "\n",
+    "It's quite common to hit a NameError in python. With foundational knowledge, you should always feel equipped to debug a NameError and get to the bottom of it.\n",
+    "\n",
+    "The most common reason if you're working in a Notebook is that you haven't executed all the cells in order, so the Kernel does not have something defined.\n",
+    "\n",
+    "If you're unsure how to fix a NameError, please see this [initial guide](https://chatgpt.com/share/67958312-ada0-8012-a1d3-62b3a5fcbbfc) and this [second guide with exercises](https://chatgpt.com/share/67a57e0b-0194-8012-bb50-8ea76c5995b8), and work through them both until you have high confidence.\n",
+    "\n",
+    "There's some repetition here, so feel free to skip it if you're already confident.\n",
+    "\n",
+    "After this, a NameError should never give you problems again!"
+   ]
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