Welcome to CS1315. Click on the python to add comments. Looking for the book? They have it at the Engineer's Bookstore at 748 Marietta St NW. Here is there website: http://www.engrbookstore.com/ - Monica
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Summer 2005 - Exam 2 Review Questions

1. 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!
2. We will try to always point out if an answer is wrong. We won't always point out when the answer is right.
3. We are glad to work with you toward the right answer. We can give hints, and we're glad to respond to partial guesses.

What is the tickertape doing? Which way does the text move? How many frames are created? How do the frame names look?

def tickertape(directory, string):
  for frame in range(0, 100):
    canvas = makePicture(getMediaPath("640x480.jpg"))
    addText(canvas, (600 - (frame * 10)) % 640, 100, string)
    framestr = str(frame)
    if frame < 10:
      writePictureTo(canvas, directory + "//frame0" + framestr + ".jpg")
    if frame >= 10:
      writePictureTo(canvas, directory + "//frame" + framestr + ".jpg")
#tickertape(r"C:\Documents and Settings\Mark Guzdial\My Documents\mediasources\tickertape",
#"Welcome to CS1315!")

Remember this part of the movie generation code? What does it do? Why is it needed?

def writeFrame(num, directory, framepict):
    # Have to deal with single digit vs. double digit frame numbers differently
    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 gets printed?

def testme(p, q, r):
  if q > 50:
    print r
  value = 10
  for i in range(1, p):
    print "Everybody"
    value = value - 1
  print value
  print r

Compute pay rates

Tracing the printing

def newFunction(a, b, c):
    print a
    list1 = range(1, 5)
    value = 0
    for x in list1:
        print b
        value = value + 1
    print c
    print value

newFunction("I", "you", "walrus")

Compute the grade

Tracing the String Programs

def string4():
  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 string5():
  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 Essay

What's the underlying representation?

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

The Cover-Up

import os
...

for file in os.listdir(directory):
  if file.endswith(".txt")
    ... perform operations on the current text file

myfile = open(fileNameAndLocation, "rt") #open file for reading
myfile = open(fileNameAndLocation, "wt") #open file for writing, clearing the contents of the file

Address book functions

Charlie Brown:1919 Peanuts Lane:Atlanta, GA:404-992-9292
Peppermint Patty:2020 Cashew Street:Atlanta, GA:404-299-2929
Calvin:101 Tiger Lane:Decatur, GA:770-899-8989

• The first is called lookup that will accept a string as input that will be some part of a name to look up. You should print out the complete line of name, address, and phone-number for the matching person–if the person is found. If the person is not found, you should print "Not found."
• The second is called phone that will take the same input, but will print out JUST THE PHONE NUMBER and "Not found" if the input name is not found.

def phonebook():
  return """
Mary:893-0234:Realtor:
Fred:897-2033:Boulder crusher:
Barney:234-2342:Professional bowler:"""

def phones():
  phones = phonebook()
  phonelist = phones.split('\n')
  newphonelist = []
  for list in phonelist:
    newphonelist = newphonelist + [list.split(":")]
  return newphonelist

def findPhone(person):
  for people in phones():
    if people[0] == person:
      print "Phone number for", person, "is", people[1]

def findTemperature():
  weatherFile = getMediaPath("AtlantaWeather1.html")
  file = open(weatherFile, "rt")
  weather = file.read()
  file.close()
  # Find the Temperature
  humloc = weather.find("Humidity")
  if humloc != -1:
    # Now, find the "," where the temp starts
    temploc = weather.rfind(",", 0, humloc)
    endline = weather.find("<", temploc)
    print "Current temperature:", weather[temploc + 1 : endline]
  if humloc == -1:
    print "They must have changed the page format -- can't find the temp"

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?

Teh Intarweb!

• HTML
• HTTP
• FTP
• URL
• DNS
• IP
• TCP/IP
• Server
• Client

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