added map and reduce

Author: profLewis

notebooks/017_Functions.ipynb

@@ -36,6 +36,8 @@
     "\n",
     "In this session, we will learn about Functions in Python. In essence, a function allows us to write better, more compact and re-usable code. This is a concept we will use a lot in later sessions, so make sure you fully familiarise yourself with the material.\n",
     "\n",
+    "We will also briefly cover some special types of function: `map()`, `reduce()` and `lambda` functions.\n",
+    "\n",
     "\n",
     "### Prerequisites\n",
     "\n",