Add initial version of chapter 02's summary

README.md

@@ -67,6 +67,7 @@ Alternatively, the content can be viewed in a web browser
       (Standard Library: `math` & `random` Modules;
        Third-party Packages: `numpy` Library;
        Writing one's own Modules)
+    - [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/chapter_02_functions/03_summary.ipynb)
 
 
 #### Videos

chapter_02_functions/03_summary.ipynb

@@ -0,0 +1,101 @@
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+    "# Chapter 2: Functions & Modularization"
+   ]
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+   "source": [
+    "## TL;DR"
+   ]
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+    "A user-defined **function** is a **named sequence** of statements that perform a computation.\n",
+    "\n",
+    "Functions provide benefits as they\n",
+    "\n",
+    "- make programs easier to comprehend and debug for humans as they give names to the smaller parts of a larger program (i.e., they **modularize** a code base), and\n",
+    "- eliminate redundancies by allowing **reuse of code**.\n",
+    "\n",
+    "Functions are **defined** once with the `def` statement. Then, they may be **called** many times with the call operator `()`.\n",
+    "\n",
+    "They may process **parameterized** inputs, **passed** in as **arguments**, and output a **return value**.\n",
+    "\n",
+    "Arguments may be passed in by **position** or **keyword**. Some functions may even require **keyword-only** arguments.\n",
+    "\n",
+    "**Lambda expressions** create anonymous functions.\n",
+    "\n",
+    "Functions are a special kind of **callables**. Any object that may be **called** with the call operator `()` is a callable. Built-in functions and **constructors** are other kinds of callables.\n",
+    "\n",
+    "Core Python can be extended with code from either the **standard library** or **third-party** libraries.\n",
+    "\n",
+    "Outside Jupyter notebooks, Python code is put into **modules** that are grouped in **packages**."
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