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Summer 2006 Midterm 2 Review

Note: The idea of this review is not to tell you exactly what is going to be on the test but to demonstrate concepts that may appear on the upcoming exam. Although we try to comprise all topics, there is a possibility that other topics covered in class and not on this review will be included on the exam

• If you don't post, neither will we. We will not be posting official solutions to these problems at all! If one of you gets it right, terrific!
• We will try to always point out if an answer is wrong. We won't always point out when the answer is right.
• We are glad to work with you toward the right answer. We can give hints, and we're glad to respond to partial guesses.
• 80% of the TA's are not robots so it may take a while to get a response. Please be patient. Especially if you post in the wee hours of the morning.
• All questions highlighted in blue are a bit trickier. They aren't all that necessary for the test, but if you can solve them, then you know you're doing well.
• These review questions in general are harder than the test.

Lower or Louder

def sound1():
  snd = makeEmptySound(3)
  value = 0
  for i in range(1,getLength(snd)):
    posn = i % 100
    if posn < 25:
      value = value + 100
    if 25 < posn < 75:
      value = value - 100
    if posn > 75:
      value = value + 100
    setSampleValueAt(snd,i,value)
  play(snd)
  return snd

def sound2():
  snd = makeEmptySound(3)
  value = 0
  for i in range(1,getLength(snd)):
    posn = i % 200
    if posn < 50:
      value = value + 200
    if 50 < posn < 150:
      value = value - 200
    if posn > 150:
      value = value + 200
    setSampleValueAt(snd,i,value)
  play(snd)
  return snd

Sound Timing Questions

Whoooo! Look at that text go!

def tickertape(directory, string):
  for frame in range(100):
    canvas = makePicture(getMediaPath("640x480.jpg"))
    x = frame * getWidth(canvas) / 100
    y = abs(50 - frame) * getHeight(canvas) / 100
    addText(canvas, x, y, string)
    num = str(frame)
    if len(num) == 1:
      num = '0' + num
    writePictureTo(canvas, directory + '//frame' + num  + '.jpg')

Movie Code Fragment

def writeFrame(num, directory, framepict):
    framenum=str(num)
    if num < 10:
        writePictureTo(framepict, directory + "//frame00" + framenum + ".jpg")
    if num >= 10 and num < 100:
        writePictureTo(framepict, directory + "//frame0" + framenum + ".jpg")
    if num >= 100:
        writePictureTo(framepict, directory + "//frame" + framenum + ".jpg")

• What does it do?
• Why is it needed?
• Can you write something shorter?

What this do?

def pharaoh(collardGreens, friedOkra):

    for i in range(1, friedOkra + 1):
        keke = ''
        for banana in range(i):
            keke = keke + collardGreens

        print keke

    for i in range(1, friedOkra):
        keke = ''
        for banana in range(friedOkra - i):
            keke = keke + collardGreens

        print keke

Tracing the printing

def newFunction(a, b, c):
    print a
    list1 = range(1, len(c))
    value = 0
    for x in list1:
        print b
        value = value + 1
    print c
    print value

String Fun

def thingamabob():
  source = "Georgia Institute of Technology"
  vowels = "aeiou"
  source = source.lower()
  for i in vowels:
    loc = source.find(i)
    if loc <> -1:
      source = source[:loc] + source[loc + 1:]
  return source

def thingamajig():
  source = "Georgia Institute of Technology"
  vowels = "aeiou"
  source=source.lower()
  for i in vowels:
    loc = source.find(i)
    while loc <> -1:
      source = source[:loc] + source[loc + 1:]
      loc = source.find(i)
  return source

Short Novel

001110100010110100101001

Encoding and Decoding

>>> letter = "Mr. Mark Guzdial requests the pleasure of your company at..."
>>> print letter.replace('a','!')
Mr. M!rk Guzdi!l requests the ple!sure of your comp!ny !t...
>>> print letter.replace('a','!').replace("e","#")
Mr. M!rk Guzdi!l r#qu#sts th# pl#!sur# of your comp!ny !t...

Count 'em up

>>> for i in "Hello":
...     print i
... 
H
e
l
l
o

Poking at your hard drive

• folder
• files
• file
• foo
• bar

Fun with HTML

1. How does <title> differ from <h1>?
2. What information goes between <html> and </html>?
3. What information goes between <body> and </body>?
4. What information goes between <head> and </head>?
5. What would you find inside the <html> and </html> but not surrounded by <body> or <head> tags?

Link to this Page

• Hotspots #3 last edited on 5 May 2008 at 10:40 am by c-76-17-124-0.hsd1.ga.comcast.net