Questions on anything?
We'll spend the first part of class going over the homework due today : practice with strings, lists, and files. I've posted my example code answers and will go over them in class.
Upcoming schedule: no class Thursday ... so the next homework, on functions, will be due Thursday next week rather than Tuesday.
point1 = Point(10, 10, 5) # SMELLY : sequential numbered variable names
point2 = Point(20, 20, 5) #
point3 = Point(30, 30, 5) #
point4 = Point(40, 40, 5) #
point1.draw(window)
Instead use a list. Access one of 'em with an index, or loop over all of 'em.
points = [Point(10, 10, 5), # BETTER : define them in a list, or one at a time with .append().
Point(20, 20, 5),
# and so on
]
points[0].setFill('red') # change one of them
for p in points: # loop over all of them
p.draw(window)
This is IMHO some of the most important material of the term.
And I want to add a bit more stuff : doc strings & doc tests.
Topics to discuss :
We'll look at lots of examples in class ... and with the online "visualize python" tool.
# An optional argument with a default value.
def scale(x, multiplier=2):
""" Return x * multiplier """ # <= doc string
return multiplier * x
print("twice 10 is {}".format( scale(10) ))
print("triple 10 is {}".format( scale(10, 3) ))
# Is x modified ?
def double(y):
y = 2*y
return y
x = 10
double_x = double(x)
print("x is ", x)
print("double_x is ", double_x)
# Is numbers modified ?
def double_all(them):
for i in range(len(them)):
them[i] = 2 * them[i]
return them
numbers = [10, 11, 12]
double_numbers = double_all(numbers)
print("numbers is ", numbers)
print("double_numbers is ", double_numbers)
Hmmm. Run these in pythontutor.com to see exactly what's going on ...
In class I showed the attached example.py doctest thingy ...
last modified | size | ||
example.py | Sun Dec 22 2024 09:20 am | 443B |