Add initial version of chapter 08's summary

08_mfr/05_summary.ipynb

@@ -0,0 +1,75 @@
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+    "# Chapter 8: Map, Filter, & Reduce (TL;DR)"
+   ]
+  },
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+   "cell_type": "markdown",
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+   "source": [
+    "The operations we do with sequential data commonly follow the **map-filter-reduce paradigm**: We apply the same transformation to all elements, filter some of them out, and calculate summary statistics from the remaining ones.\n",
+    "\n",
+    "An essential idea in this chapter is that, in many situations, we need *not* have all the data **materialized** in memory. Instead, **iterators** allow us to process sequential data on a one-by-one basis.\n",
+    "\n",
+    "Examples for iterators are the `map`, `filter`, and `generator` types."
+   ]
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CONTENTS.md

@@ -227,3 +227,4 @@ If this is not possible,
       [<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/08_mfr/04_content.ipynb)
       (Iterators vs. Iterables;
        Example: `sorted()` vs. `reversed()`)
+    - [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/08_mfr/05_summary.ipynb)