--- Paul McGuire <pt...@austin.rr.com> wrote:

I'm thinking you could actually have a progression
from a 1 line program up to a 50-line program.  The
number 50 is kind of arbitrary, but my gut says that
by a 50-line program, you will have demonstrated
almost every useful concept.

Here's my challenge to whoever wants to take it--write
(or find) a program with 20 or fewer lines that
sufficiently motivates the need for classes, has
decent Python style, and is newbie friendly.

The tutorial has this example, which is useful for
demonstrating the syntax of classes, but it doesn't
actually do anything interesting:

class MyClass:
    "A simple example class"
    i = 12345
    def f(self):
        return 'hello world'

It also has a ComplexNumber class, but I don't want to
scare away mathphobes.

It does have this idiom, which I think is worth
putting somewhere into the progression.

class Employee:
    pass

john = Employee() # Create an empty employee record

# Fill the fields of the record
john.name = 'John Doe'
john.dept = 'computer lab'
john.salary = 1000