Add initial version of chapter 07's summary

07_sequences/06_summary.ipynb

@@ -0,0 +1,85 @@
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+    "# Chapter 7: Sequential Data (TL;DR)"
+   ]
+  },
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+    "**Sequences** are an *abstract* concept that summarizes *four* behaviors an object may or may not exhibit. Sequences are\n",
+    "- **finite** and\n",
+    "- **ordered**\n",
+    "- **containers** that we may\n",
+    "- **loop over**.\n",
+    "\n",
+    "Examples are the `list`, `tuple`, but also the `str` types.\n",
+    "\n",
+    "Objects that exhibit all behaviors *except* being ordered are referred to as **collections**.\n",
+    "\n",
+    "The objects inside a sequence are called its **elements** and may be labeled with a unique **index**, an `int` object in the range $0 \\leq \\text{index} < \\lvert \\text{sequence} \\rvert$.\n",
+    "\n",
+    "`list` objects are **mutable**. That means we can change the references to the other objects it contains, and, in particular, re-assign them.\n",
+    "\n",
+    "On the contrary, `tuple` objects are like **immutable** lists: We can use them in place of any `list` object as long as we do *not* need to mutate it. Often, `tuple` objects are also used to model **records** of related **fields**."
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CONTENTS.md

@@ -186,4 +186,5 @@ If this is not possible,
       (Packing & Unpacking with Functions)
     - [appendix <img height="12" style="display: inline-block" src="static/link/to_nb.png">](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/develop/07_sequences/05_appendix.ipynb)
       [<img height="12" style="display: inline-block" src="static/link/to_mb.png">](https://mybinder.org/v2/gh/webartifex/intro-to-python/develop?urlpath=lab/tree/07_sequences/05_appendix.ipynb)
-      (`namedtuple` Type)
+      (`namedtuple` Type)
+    - [summary <img height="12" style="display: inline-block" src="static/link/to_nb.png">](https://nbviewer.jupyter.org/github/webartifex/intro-to-python/blob/develop/07_sequences/06_summary.ipynb)