First up: discuss the homework due today.
My sample answers are in code/homework/oct4 :
Please take these examples of mine as "good coding practice" and where you can follow this format for everything else you do this semester: docstrings, doctests (where appropriate, they aren't always), and short, clearly defined functions with clean arguments (inputs) and return value (outputs).
Any questions about anything?
Here's the schedule I have in mind the rest of the term :
Then in our last month we should just about time to finish the text :
I will post assignment due next Thursday within the next few days - start by please reading chapter 7 this week.
I'll either just show examples or use the textbook's slides to walk through the topics in chapter 7 .
Which is biggest?
First try: "if x1 >= x2 >= x3" ... Hmmm. Valid in python but not in most code. Also, (5,2,4) gives False; doesn't identify x1 as biggest.
Second try : "if x1 >= x2 and x1 >= x3" ... better i. More about "and" in the next chapter.
if x1 >= x2 and x1 >= x3: maxval = x1 elif x2 >= x1 and x2 >= x3: maxval = x2 else: maxval = x3
or how about this instead
if x1 >= x2: if x1 >= x3: maxvval = x1 else: maxval = x3 else: if x2 >= x3: maxval = x2 else: maxval = x3
Draw that as a flowchart and trace through some examples.
Or we could just test each in turn ...
maxval = x1 if x2 > maxval: maxval = x2 if x3 > maxval: maxval = x3
This approach scales nicely to bigger collections.
In this case python has a built-in ...
max(x1, x2, x3). :)