update HW0

HW0.ipynb

@@ -11,6 +11,10 @@
           "source": [
             "# Homework 0\n", 
             "\n", 
+            "### Due Tuesday, September 10 (but no submission is required)\n", 
+            "\n", 
+            "---\n", 
+            "\n", 
             "Welcome to CS109 / STAT121 / AC209 / E-109 (http://cs109.org/).  In this class, we will be using a variety of tools that will require some initial configuration. To ensure everything goes smoothly moving forward, we will setup the majority of those tools in this homework. While some of this will likely be dull, doing it now will enable us to do more exciting work in the weeks that follow without getting bogged down in further software configuration. This homework will not be graded, however it is essential that you complete it timely since it will enable us to set up your accounts. You do not have to hand anything in, with the exception of filling out the online survey. \n", 
             "\n", 
             "## Class Survey, Piazza, and Introduction\n", 
@@ -38,6 +42,8 @@
             "* How to learn new libraries by reading documentation.\n", 
             "* Asking questions on StackOverflow or Piazza.\n", 
             "\n", 
+            "There are many online tutorials to introduce you to scientific python programming. [Here is one](https://github.com/jrjohansson/scientific-python-lectures) that is very nice. Lectures 1-4 are most relevant to this class.\n", 
+            "\n", 
             "## Getting Python\n", 
             "\n", 
             "You will be using Python throughout the course, including many popular 3rd party Python libraries for scientific computing. [Anaconda](http://continuum.io/downloads) is an easy-to-install bundle of Python and most of these libraries. We recommend that you use Anaconda for this course.\n",