Updating the notebooks

Author: AllenDowney

chapters/chap00.ipynb

@@ -171,9 +171,9 @@
  "\n",
  "If you are teaching with this book, here are some resources you might find useful.\n",
  "\n",
- "* You can find notebooks with solutions to the exercises from <https://allendowney.github.io/ThinkPython>, along with links to the additional resources below.\n",
+ "* You can find notebooks with solutions to the exercises at <https://allendowney.github.io/ThinkPython>, along with links to the additional resources below.\n",
  "\n",
- "* Quizzes for each chapter, and a summative quiz for the whole book, are available from [COMING SOON]\n",
+ "* Quizzes for each chapter, and a summative quiz for the whole book, are available on request.\n",
  "\n",
  "* *Teaching and Learning with Jupyter* is an online book with suggestions for using Jupyter effectively in the classroom. You can read the book at <https://jupyter4edu.github.io/jupyter-edu-book>\n",
  "\n",

chapters/chap10.ipynb

@@ -611,18 +611,6 @@
  "The time it takes to find a key in a dictionary is almost constant -- regardless of the number of items."
  ]
  },
- {
- "cell_type": "code",
- "execution_count": 63,
- "id": "aa079ed3",
- "metadata": {},
- "outputs": [],
- "source": [
- "d = {'a': 1, 'b': 2}\n",
- "d['a'] = 3\n",
- "d"
- ]
- },
  {
  "cell_type": "markdown",
  "id": "b3bfa8a5",