Summer 2005 - Final Exam Review


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Summer 2005 - Final Exam Review

This review is harder than the final

Anything denoted with a "hmm" is significantly harder. If you can solve those, then you know you're in good shape.

Conceptual Questions about Jython You Really Ought to Know

What does def LITERALLY do?
Why is return so much more special than print?
How does the string "1" differ from a numerical 1?
What are objects?

If you forget everything else we taught you, you should at least know...

Why do we write programs?
When wouldn't you write a program
Did a bunch of crazy CS TA's get together and invent Python merely for the purpose of torturing 1315 Students?
Did a bunch of crazy CS TA's get together and invent JES merely for the purpose of torturing 1315 Students?

Questions on Basic Concepts

Pixel iterating

Write a function that takes in a picture and does something to each pixel. That's right, CS is creative. Do anything you want to the pixel.
(Hmm) Now take your function from the previous part and modify it so that it only modifies everything that's at least 20 pixels away from the edges (Hint: use ranges)
(Hmm, hmm) Now take that function and modify it so that it only modifies the pixels that are within 100 pixels of the top-left corner (Hint: use the distance formula and an if statement)

Questions on Pixel Iterating

Flipping

Write a function that takes in a picture and flips the whole thing horizontally
Write a function that takes in a picture and flips the whole thing vertically (Don't write a new function, just modify your code from the previous problem)
(Hmm) Write a function that takes in a picture and flips the top half of the picture vertically and the bottom half horizontally.

Questions on Mirroring/Flipping Pictures

Movies

Write a function that takes in a directory and outputs 100 frames to that directory called "frame00.jpg", "frame01.jpg", ..., "frame99.jpg". The movie is just a 50 pixel by 50 pixel picture that steadily fades from black to lime green over the course of the 100 frames.
(Hmm) Write a function (100 frames, takes in a directory, you know the routine now), and makes a movie. The frames are 100 pixels by 100 pixels with a black background with a single white pixel that travels from the bottom left corner to the top right corner over the course of the 100 frames. (Hint: think of drawing a pixel as drawing a rectangle with width and height of 1. This is also very much like the tickertape problem.)

Questions on Movies

HTML

How many errors are on this?

<html>

<head>
<h1>My webpage</h1>
</head>

<body>
<title>Welcome</title>

<image src=me.jpg>

<p>This is my first paragraph
<p>This is my second paragraph

Thank you for visiting

<a href="helpMe@html.com">Send me comments!</a>

</html>

How would you fix this?

Questions on HTML

import os Magic

Write a function that takes in a directory. The function will print out the following information:
- How many pictures (.gif, .jpg, .png, .bmp) are in the directory.
- How many text documents (.txt, .rtf, .doc) are in the directory.
- How many python files(.py) are in the directory.

>>> yeehaw(r"C:\documents and settings\Blake O'Hare\Desktop")
Pictures: 2
Text Documents: 9375390
Python Files: 20035

Extra cool points: Write a function called avgFileSize that takes in a directory and returns the average file size in terms of Megabytes. (Yes, we've taught you everything you need to know to be able to do this.)

Questions on import os

Phone Book++

Consider the following phone book stored in a file called "talkybanana.txt" in your JES folder:

Blake O'Hare/404-314-1592
NASA/713-483-3111
White House/202-456-1414
Pope/011-39-6-6982
Kremlin/0107-095-295-9051

Write a function called getEntry that takes in a name and returns the phone number
Write a function called addEntry that takes in a name and a phone number and adds it to the file
(Hmm) Write a function called deleteEntry that takes in a name and deletes it from the file.

Questions on the Phone Book

Website Snatching

<html>

<head>
<title>The News</title>
</head>

<body>

<h1>Today's Headlines</h2>

<ul>
<li>Scientists link donuts with obesity.</li>
<li>GT students are the happiest according to Princeton Review.</li>
<li>Microsoft goes open source.</li>
</ul>

</body>
</html>

Suppose this page could be found at http://www.blake.com/news.html. Write a function that goes to this page and returns a list of all the headlines.

Questions on Website Parsing

Manipulating a Sound

Write a function called flipLeft that takes in a sound and reverses the first half only.
Write a function called fadeAway that takes in a 22kHz sound and fades the last second to silence. You can assume that the sound passed in will be more than 1 second in length.

Questions on Sound

Recursion

Using recursion, write a function that...

reverses a string
finds the length of a string
converts a string to uppercase
sums the numbers in a list
decreases the red in a picture (Remember: getPixels gives you a list of pixels)

Questions on Recursion

The Internet

Briefly discuss the following...

HTTP
FTP
HTML
TCP/IP
DNS
IP

What is a...

Server
Client

Questions on the Internet

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