Merge pull request #15 from PracticumAI/May_updates

May updates

Author: magitz

01.1_getting_started.ipynb

@@ -207,6 +207,7 @@
    },
    "outputs": [],
    "source": [
+    "z = 3\n",
     "z + 0.14"
    ]
   },

01.2_getting_started.ipynb

@@ -46,20 +46,6 @@
     "Fix the codeblock above to print both the Spanish and Arabic greeting text."
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "# One possible solution for instructor version\n",
-    "\n",
-    "spanish_greeting = 'Hola'\n",
-    "print(spanish_greeting)\n",
-    "arabic_greeting = 'Ahlan was sahlan'\n",
-    "print(arabic_greeting)"
-   ]
-  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -150,21 +136,6 @@
     "```"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "#### 1.1.2. `.format()` formatting\n",
-    "\n",
-    "The `.format()` method works by placing replacement fields in the text using curly braces, \"{}\". The values to interpolate are passes in the `.format()` method.\n",
-    "\n",
-    "[This article](https://www.geeksforgeeks.org/python-string-format-method/) provides more information and examples of the `.format()` method.\n",
-    "\n",
-    "```python\n",
-    "print(\"{} fans like {} {}%!\".format(mascot, likes, how_much))\n",
-    "```"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": null,

02.1_libraries.ipynb

@@ -72,43 +72,15 @@
     "help(math)"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "NAME\n",
-    "    math\n",
-    "\n",
-    "MODULE REFERENCE\n",
-    "    http://docs.python.org/3/library/math\n",
-    "\n",
-    "    The following documentation is automatically generated from the Python\n",
-    "    source files.  It may be incomplete, incorrect or include features that\n",
-    "    are considered implementation detail and may vary between Python\n",
-    "    implementations.  When in doubt, consult the module reference at the\n",
-    "    location listed above.\n",
-    "\n",
-    "DESCRIPTION\n",
-    "    This module is always available.  It provides access to the\n",
-    "    mathematical functions defined by the C standard.\n",
-    "\n",
-    "FUNCTIONS\n",
-    "    acos(...)\n",
-    "        acos(x)\n",
-    "\n",
-    "        Return the arc cosine (measured in radians) of x."
-   ]
-  },
   {
    "cell_type": "markdown",
    "metadata": {},
    "source": [
     "## 2. Import specific items from a library module to shorten programs\n",
     "\n",
     "* >Use `from ______ import _____` to load only specific items from a library.\n",
-    "* Then refer to them directly without library name as prefix."
+    "* Then refer to them directly without library name as prefix.\n",
+    "* It is not a good idea to import *everything* from a library this way...e.g. you may see examples that suggest something like `from math import *`. That is likely to create namespace problems and other issues and is not recommended. "
    ]
   },
   {

03.2_conditionals.ipynb

@@ -416,7 +416,12 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "so it is perfectly clear to a reader (and to Python) what you really mean."
+    "so it is perfectly clear to a reader (and to Python) what you really mean.\n",
+    "\n",
+    "\n",
+    "<div style=\"padding: 10px;margin-bottom: 20px;border: thin solid #E5C250;border-left-width: 10px;background-color: #fff\">\n",
+    "    <p><strong>Tip:</strong> Try to keep code simple and easy to read. In the example above, parentheses help, but is still a bit unclear and could use some comments to help a reader understand the logic behind the code.</p>\n",
+    "   </div>"
    ]
   },
   {

03.3_functions.ipynb

@@ -445,7 +445,7 @@
     "rich = \"gold\"\n",
     "poor = \"tin\"\n",
     "print(max(rich, poor))\n",
-    "print(max(len(rich, len(poor)))"
+    "print(max(len(rich, len(poor))))"
    ]
   },
   {

04.2_data_wrangling.ipynb

@@ -171,6 +171,24 @@
     "pd.plotting.scatter_matrix(df)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### 2.2 Saving plots\n",
+    "\n",
+    "We may want to save the output of a plot. This can be done using the  `plt.savefig()` function. By default, the format will be determined from the filename extension you provide."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "plt.savefil('plot.pdf')"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},