intro-to-python/09_mappings/06_summary.ipynb

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    "# Chapter 9: Mappings & Sets (TL;DR)"
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    "`dict` objects are **mutable** one-to-one **mappings** from a set of **key** objects to a set of **value** objects. The association between a key-value pair is also called **item**.\n",
    "\n",
    "The items contained in a `dict` object have **no order** that is *predictable*.\n",
    "\n",
    "The underlying **data structure** of the `dict` type are **hash tables**. They make key look-ups *extremely* fast by converting the items' keys into *deterministic* hash values specifiying *precisely* one of a fixed number of equally \"wide\" buckets in which an item's references are stored. A limitation is that objects used as keys must be *immutable* (for technical reasons) and *unique* (for practical reasons).\n",
    "\n",
    "A `set` object is a **mutable** and **unordered collection** of **immutable** objects. The `set` type mimics sets we know from math."
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