minor tweaks and typo fixes

Session 3 - Functions/Session 3 - Exercise Solutions.ipynb

@@ -374,7 +374,7 @@
    "source": [
     "* **Note 1:** Call to function `circle_area` defined in Exercise instead of defining the expression `pi * r**2 / 4` again. The concept of functions calling other functions can be used to make modular programs that are easy to follow and maintain. Each function only needs to do a small thing in itself.\n",
     "\n",
-    "* **Note 2:** The input parameter when the function was *defined* was a list called `radii`, but the when the function was *called*, the input list was called `list_of_radii`. Thus, the input parameters passed into a function do not need to have the same name as when the function is defined."
+    "* **Note 2:** The input parameter when the function was *defined* was a list called `radii`, but when the function was *called*, the input list was called `list_of_radii`. Thus, the input parameters passed into a function do not need to have the same name as when the function is defined."
    ]
   },
   {
@@ -814,7 +814,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.1"
+   "version": "3.7.5"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,

Session 3 - Functions/Session 3 - Functions.ipynb

@@ -292,7 +292,7 @@
    },
    "source": [
     "\n",
-    "# 3. - Functions\n",
+    "# 3. Functions\n",
     "A **function** is a block of code that is first defined, and thereafter can be called to run as many times as needed. A function might have arguments, some of which can be optional if a default value is specified.\n",
     "\n",
     "A function is called by parentheses: `function_name()`. Arguments are placed inside the parentehes and comma separated if there are more than one.\n",
@@ -447,10 +447,20 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {
-    "cell_style": "center"
-   },
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "SyntaxError",
+     "evalue": "invalid syntax (<ipython-input-1-febc0acd8c48>, line 3)",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-1-febc0acd8c48>\"\u001b[1;36m, line \u001b[1;32m3\u001b[0m\n\u001b[1;33m    The built-in `enumerate` is useful when you want to loop over an iterable together with the index of each of its elements:\u001b[0m\n\u001b[1;37m            ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
+     ]
+    }
+   ],
    "source": [
+    "## Examples of built-in functions\n",
     "### Using `enumerate` for looping in index/value pairs\n",
     "The built-in `enumerate` is useful when you want to loop over an iterable together with the index of each of its elements:"
    ]
@@ -612,7 +622,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "`zip` stops when the shortest iterable is exhausted. So if if `c` is removed from the first string in the example above, we have iterables of lengths 2, 3 and 3. \n",
+    "`zip` stops when the shortest iterable is exhausted. So if `c` is removed from the first string in the example above, we have iterables of lengths 2, 3 and 3. \n",
     "\n",
     "Thus, only two iterations are performed:"
    ]
@@ -692,7 +702,7 @@
     "    # Your code goes here\n",
     "~~~\n",
     "\n",
-    "Try to call it to see if it works. If you want to access `pi` to avoid typing it out yourself, put the line `from math import pi` at some point before calling the `circle_area` function.\n"
+    "Try to call it to see if it works. If you want to access `pi` to avoid typing it out yourself, put the line `from math import pi` at some point before defining the `circle_area` function.\n"
    ]
   },
   {
@@ -700,7 +710,7 @@
    "metadata": {},
    "source": [
     "# Exercise 2\n",
-    "Write a function that takes a list `radii` as input and returns a list of the corresponding circle areas. Try to set it up from scratch and test it.\n",
+    "Write a function that takes a list `radii` as input and returns a list of the corresponding circle areas. Try to set it up from scratch and test it (note that the build-in `map()` function does the same).\n",
     "\n",
     "You can use the function from the previous exercise if you want."
    ]
@@ -866,7 +876,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.1"
+   "version": "3.7.5-final"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,
@@ -907,4 +917,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 2
-}
+}