intro-to-python/06_text/03_summary.ipynb

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    "# Chapter 6: Text & Bytes (TL;DR)"
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    "Textual data is modeled with the **immutable** `str` type.\n",
    "\n",
    "The `str` type supports *four* orthogonal **abstract concepts** that together constitute the idea of a **sequence**: Every `str` object is an *iterable container* of a *finite* number of *ordered* characters.\n",
    "\n",
    "A single **character** in a `str` object follows the idea of a **Unicode** character. It is mapped to a *unique* **code point** that is encoded into **bytes** with a dedicated character encoding, for example, **UTF-8**."
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