CSC111 Homework 10 2011

--D. Thiebaut 12:41, 29 November 2011 (EST)

---

This is an A/E type of homework. You have several problems to solve. You either get an A or an E on each one. What is important here is Python, not documentation or robustness (this is an exception to the rule!--pun intended!). You have to solve different problems and make your program output the correct answer. Correct answers get A, incorrect ones get E. I will not read the code closely and take point for lack of documentation, and I will not try to make your program crash to test its robustness.
The main goal for this particular assignment is for you to use classes and objects and make them work.
This assignment is due Tuesday evening, Dec. 6, at midnight.

Problem 1

• Modify the car class we saw in class (some code available on the class Web page), and make the class contain
  • a rectangle for the body,
  • a rectangle for the cab part,
  • a rectangle (or rectangles) for the window (or windows),
  • a Text caption in the middle of the body (s.a. "Taxi" ),
  • and a move() method, so that we can make the car move out of the screen with this loop:

     for i in range( 500 ):
          car.move( 2, 0 );

(we assume that car is an object instantiated from the class Car.)

• Make your program implement this loop so that we can see the car move out of the graphic window.

Submission

• Store your program in a file called hw10a.py and submit it this way:

    rsubmit hw10 hw10a.py         

if you are working on beowulf or use the http://cs.smith.edu/~111a/submit10.htm submit form.

Problem 2

• Play with the program below:

from graphics import *

class Ball:
    def __init__(self, c, r ):
        self.c = Circle( c, r )
        self.dx = 0
        self.dy = 0

    def draw( self, win ):
        self.c.draw( win )

    def setFill( self, col ):
        self.c.setFill( col )

    def setDirection( self, dx, dy ):
        self.dx = dx
        self.dy = dy

    def move( self ):
        self.c.move( self.dx, self.dy )


def main():
    width  = 800
    height = 600
    win = GraphWin( "111a-xx HW10", width, height )
    b1 = Ball( Point( width/4, height/2 ), 10 )
    b1.setFill( "blue" )
    b1.setDirection( 1, 2 )
    b1.draw( win )
    
    b2 = Ball( Point( width/4, height/2 ), 10 )
    b2.setFill( "green" )
    b2.setDirection( 2, 1 )
    b2.draw( win )

    while True:
        b1.move()
        b2.move()
        if win.checkMouse() != None:
            break

    win.close()

main()

• This code is not documented, and for this homework documentation is not required.
• Note how each ball remembers its direction of movement in the two member variables self.dx and self.dy.

Assignment

• Add a new method to the Ball class called changeDirIfHittingWall(). This method changes the sign of self.dx or of self.dy when the ball hits a vertical or horizontal wall (the boundaries of the window). For example, when the ball hits a vertical wall, then the method will change self.dx to be -self.dx.
• If your method is written correctly, the main function below will see the balls bouncing off all the windows borders in a natural fashion, in a way similar to what we have done many times before.

def main():
    width  = 800
    height = 600
    win = GraphWin( "111a-xx HW10", width, height )
    b1 = Ball( Point( width/4, height/2 ), 10 )
    b1.setFill( "blue" )
    b1.setDirection( 1, 2 )
    b1.draw( win )
    
    b2 = Ball( Point( width/4, height/2 ), 10 )
    b2.setFill( "green" )
    b2.setDirection( 2, 1 )
    b2.draw( win )

    while True:
        b1.move()
        b2.move()
        if win.checkMouse() != None:
            break
        b1.changeDirIfHittingWall( width, height )
        b2.changeDirIfHittingWall( width, height )
        
    win.close()

Additional Information

• the balls must bounce off all four borders of the window.
• the balls do not have to bounce off each other.

Submission

• Call your program hw10b.py and submit it as indicated in Problem 1 above.

Problem 3

• And you thought we were done with the presidents!...
• Play with the code below:

presidents = \
"""Presidency ,President ,Wikipedia Entry,Took office ,Left office ,Party ,Portrait,Thumbnail,Home State
1,George Washington,http://en.wikipedia.org/wiki/George_Washington,30/04/1789,4/03/1797,Independent ,GeorgeWashington.jpg,thmb_GeorgeWashington.jpg,Virginia
2,John Adams,http://en.wikipedia.org/wiki/John_Adams,4/03/1797,4/03/1801,Federalist ,JohnAdams.jpg,thmb_JohnAdams.jpg,Massachusetts
3,Thomas Jefferson,http://en.wikipedia.org/wiki/Thomas_Jefferson,4/03/1801,4/03/1809,Democratic-Republican ,Thomasjefferson.gif,thmb_Thomasjefferson.gif,Virginia
4,James Madison,http://en.wikipedia.org/wiki/James_Madison,4/03/1809,4/03/1817,Democratic-Republican ,JamesMadison.gif,thmb_JamesMadison.gif,Virginia
5,James Monroe,http://en.wikipedia.org/wiki/James_Monroe,4/03/1817,4/03/1825,Democratic-Republican ,JamesMonroe.gif,thmb_JamesMonroe.gif,Virginia
6,John Quincy Adams,http://en.wikipedia.org/wiki/John_Quincy_Adams,4/03/1825,4/03/1829,Democratic-Republican/National Republican ,JohnQuincyAdams.gif,thmb_JohnQuincyAdams.gif,Massachusetts
7,Andrew Jackson,http://en.wikipedia.org/wiki/Andrew_Jackson,4/03/1829,4/03/1837,Democratic ,Andrew_jackson_head.gif,thmb_Andrew_jackson_head.gif,Tennessee
8,Martin Van Buren,http://en.wikipedia.org/wiki/Martin_Van_Buren,4/03/1837,4/03/1841,Democratic ,MartinVanBuren.gif,thmb_MartinVanBuren.gif,New York
9,William Henry Harrison,http://en.wikipedia.org/wiki/William_Henry_Harrison,4/03/1841,4/04/1841,Whig,WilliamHenryHarrison.gif,thmb_WilliamHenryHarrison.gif,Ohio
10,John Tyler,http://en.wikipedia.org/wiki/John_Tyler,4/04/1841,4/03/1845,Whig,JohnTyler.jpg,thmb_JohnTyler.jpg,Virginia
11,James K. Polk,http://en.wikipedia.org/wiki/James_K._Polk,4/03/1845,4/03/1849,Democratic ,JamesKPolk.gif,thmb_JamesKPolk.gif,Tennessee
12,Zachary Taylor,http://en.wikipedia.org/wiki/Zachary_Taylor,4/03/1849,9/07/1850,Whig,ZacharyTaylor.jpg,thmb_ZacharyTaylor.jpg,Louisiana
13,Millard Fillmore,http://en.wikipedia.org/wiki/Millard_Fillmore,9/07/1850,4/03/1853,Whig,MillardFillmore.png,thmb_MillardFillmore.png,New York
14,Franklin Pierce,http://en.wikipedia.org/wiki/Franklin_Pierce,4/03/1853,4/03/1857,Democratic ,FranklinPierce.gif,thmb_FranklinPierce.gif,New Hampshire
15,James Buchanan,http://en.wikipedia.org/wiki/James_Buchanan,4/03/1857,4/03/1861,Democratic ,JamesBuchanan.gif,thmb_JamesBuchanan.gif,Pennsylvania
16,Abraham Lincoln,http://en.wikipedia.org/wiki/Abraham_Lincoln,4/03/1861,15/04/1865,Republican/National Union,AbrahamLincoln.jpg,thmb_AbrahamLincoln.jpg,Illinois
17,Andrew Johnson,http://en.wikipedia.org/wiki/Andrew_Johnson,15/04/1865,4/03/1869,Democratic/National Union,AndrewJohnson.gif,thmb_AndrewJohnson.gif,Tennessee
18,Ulysses S. Grant,http://en.wikipedia.org/wiki/Ulysses_S._Grant,4/03/1869,4/03/1877,Republican ,UlyssesSGrant.gif,thmb_UlyssesSGrant.gif,Ohio
19,Rutherford B. Hayes,http://en.wikipedia.org/wiki/Rutherford_B._Hayes,4/03/1877,4/03/1881,Republican ,RutherfordBHayes.png,thmb_RutherfordBHayes.png,Ohio
20,James A. Garfield,http://en.wikipedia.org/wiki/James_A._Garfield,4/03/1881,19/09/1881,Republican ,James_Garfield.jpg,thmb_James_Garfield.jpg,Ohio
21,Chester A. Arthur,http://en.wikipedia.org/wiki/Chester_A._Arthur,19/09/1881,4/03/1885,Republican ,ChesterAArthur.gif,thmb_ChesterAArthur.gif,New York
22,Grover Cleveland,http://en.wikipedia.org/wiki/Grover_Cleveland,4/03/1885,4/03/1889,Democratic ,Grover_Cleveland_2.jpg,thmb_Grover_Cleveland_2.jpg,New York
23,Benjamin Harrison,http://en.wikipedia.org/wiki/Benjamin_Harrison,4/03/1889,4/03/1893,Republican ,BenjaminHarrison.gif,thmb_BenjaminHarrison.gif,Indiana
24,Grover Cleveland,http://en.wikipedia.org/wiki/Grover_Cleveland,4/03/1893,4/03/1897,Democratic ,Grover_Cleveland.jpg,thmb_Grover_Cleveland.jpg,New York
25,William McKinley,http://en.wikipedia.org/wiki/William_McKinley,4/03/1897,14/9/1901,Republican ,WilliamMcKinley.gif,thmb_WilliamMcKinley.gif,Ohio
26,Theodore Roosevelt,http://en.wikipedia.org/wiki/Theodore_Roosevelt,14/9/1901,4/3/1909,Republican ,TheodoreRoosevelt.jpg,thmb_TheodoreRoosevelt.jpg,New York
27,William Howard Taft,http://en.wikipedia.org/wiki/William_Howard_Taft,4/3/1909,4/03/1913,Republican ,WilliamHowardTaft.jpg,thmb_WilliamHowardTaft.jpg,Ohio
28,Woodrow Wilson,http://en.wikipedia.org/wiki/Woodrow_Wilson,4/03/1913,4/03/1921,Democratic ,WoodrowWilson.gif,thmb_WoodrowWilson.gif,New Jersey
29,Warren G. Harding,http://en.wikipedia.org/wiki/Warren_G._Harding,4/03/1921,2/8/1923,Republican ,WarrenGHarding.gif,thmb_WarrenGHarding.gif,Ohio
30,Calvin Coolidge,http://en.wikipedia.org/wiki/Calvin_Coolidge,2/8/1923,4/03/1929,Republican ,CoolidgeWHPortrait.gif,thmb_CoolidgeWHPortrait.gif,Massachusetts
31,Herbert Hoover,http://en.wikipedia.org/wiki/Herbert_Hoover,4/03/1929,4/03/1933,Republican ,HerbertHover.gif,thmb_HerbertHover.gif,Iowa
32,Franklin D. Roosevelt,http://en.wikipedia.org/wiki/Franklin_D._Roosevelt,4/03/1933,12/4/1945,Democratic,FranklinDRoosevelt.gif,thmb_FranklinDRoosevelt.gif,New York
33,Harry S. Truman,http://en.wikipedia.org/wiki/Harry_S._Truman,12/4/1945,20/01/1953,Democratic,HarryTruman.jpg,thmb_HarryTruman.jpg,Missouri
34,Dwight D. Eisenhower,http://en.wikipedia.org/wiki/Dwight_D._Eisenhower,20/01/1953,20/01/1961,Republican ,Dwight_D_Eisenhower.jpg,thmb_Dwight_D_Eisenhower.jpg,Texas
35,John F. Kennedy,http://en.wikipedia.org/wiki/John_F._Kennedy,20/01/1961,22/11/1963,Democratic,John_F_Kennedy.jpg,thmb_John_F_Kennedy.jpg,Massachusetts
36,Lyndon B. Johnson,http://en.wikipedia.org/wiki/Lyndon_B._Johnson,22/11/1963,20/1/1969,Democratic,Lyndon_B_Johnson.gif,thmb_Lyndon_B_Johnson.gif,Texas
37,Richard Nixon,http://en.wikipedia.org/wiki/Richard_Nixon,20/1/1969,9/8/1974,Republican,RichardNixon.gif,thmb_RichardNixon.gif,California
38,Gerald Ford,http://en.wikipedia.org/wiki/Gerald_Ford,9/8/1974,20/01/1977,Republican,Gerald_R_Ford.jpg,thmb_Gerald_R_Ford.jpg,Michigan
39,Jimmy Carter,http://en.wikipedia.org/wiki/Jimmy_Carter,20/01/1977,20/01/1981,Democratic ,James_E_Carter.gif,thmb_James_E_Carter.gif,Georgia
40,Ronald Reagan,http://en.wikipedia.org/wiki/Ronald_Reagan,20/01/1981,20/01/1989,Republican ,ReaganWH.jpg,thmb_ReaganWH.jpg,California
41,George H. W. Bush,http://en.wikipedia.org/wiki/George_H._W._Bush,20/01/1989,20/01/1993,Republican ,George_H_W_Bush.gif,thmb_George_H_W_Bush.gif,Texas
42,Bill Clinton,http://en.wikipedia.org/wiki/Bill_Clinton,20/01/1993,20/01/2001,Democratic ,Clinton.jpg,thmb_Clinton.jpg,Arkansas
43,George W. Bush,http://en.wikipedia.org/wiki/George_W._Bush,20/01/2001,20/01/2009,Republican ,George_W_Bush.jpg,thmb_George_W_Bush.jpg,Texas
44,Barack Obama, http://en.wikipedia.org/wiki/Barack_Obama,20/01/2009,Incumbent ,  Democratic   ,Barack_Obama.jpg,thmb_Barack_Obama.jpg,Illinois"""

class President:
    """ A class for one president.  Holds all the info relative to a president as strings"""
    
    def __init__( self, n, name, url, dateIn, dateOut, party, pic, thumb, state ):
        self.n       = n 
        self.name    = name
        self.url     = url
        self.dateIn  = dateIn
        self.dateOut = dateOut
        self.party   = party
        self.pic     = pic
        self.thumb   = thumb
        self.state   = state

    def isDemocrat( self ):
        return self.party.lower().find( "democ" ) != -1

    def isRepublican( self ):
        return self.party.lower().find( "republi" ) != -1

    def is3rdParty( self ):
        return not self.isDemocrat() and not self.isRepublican()


    def toString( self ):
        party = ""
        if self.isDemocrat():   party = "D"
        if self.isRepublican(): party += "R"
        if self.is3rdParty():   party = "Other"
        
        return "%s: %30s(%s) %s-%s from %s" % \
               ( self.n, self.name, party, self.dateIn, self.dateOut, self.state )

def createListOfPres( text ):
    """parses the text containing the CSV list of presidents and returns a list of 
    president objects, or an empty list if nothing could be read"""

    try:
        lines = text.split( '\n' )[1:]
    except (IndexError ):
        return []
    
    prez = []
    for line in lines:
        try:
            n, name, url, dateIn, dateOut, party, pic, thumb, state = line.split( ',' )
        except (ValueError,NameError):
            continue
        # create president object and add it to the list prez
        prez.append( President( n, name, url, dateIn, dateOut, party, pic, thumb, state ) )

    # return the list of president objects
    return prez


def main(): 
    # get a list of objects, each one a president
    prez = createListOfPres( presidents )

    # print each president without url or image info.
    for p in prez:
        print( p.toString() )

main()

Your assignment

Part 1

• For this part you cannot modify the President class.
• Make the main program output the number of democratic presidents, the number of republican presidents, and the number of "other" party presidents.
• You can only modify the main() function.
• Whatever you do, you cannot use the string presidents again, once it has been processed by createListOfPres().

Part 2

• For this part you can add new methods to the President class.
• You cannot use the string presidents once createListOfPres() has parsed it.
• Make your program prompt the user for a year, and output the president or presidents who was/were on active duty that year.
• It is fine (no penalty) if your program does not output Obama for 2011, but it is nice if it does!

Submission

• Store your program in a file called hw10c.py and submit it as illustrated in Problem 1 above.

Problem 4

Your assignment

• My cat ate my program! Yes, she did! I had a nicely written (though not documented) program, was ready to show it to you, but my cat ate part of it.
• The good part is: I kept a copy of the program's output when it was still in its complete state:

                       Cheetah       70.0 mph
            Pronghorn Antelope       61.0 mph
                    Wildebeest       50.0 mph
                          Lion       50.0 mph
             Thomson's Gazelle       50.0 mph
                 Quarter Horse       47.5 mph
                           Elk       45.0 mph
              Cape Hunting Dog       45.0 mph
                        Coyote       43.0 mph
                      Gray Fox       42.0 mph
                         Hyena       40.0 mph
                         Zebra       40.0 mph
            Mongolian Wild Ass       40.0 mph
                     Greyhound       39.4 mph
                       Whippet       35.5 mph
             Rabbit (domestic)       35.0 mph
                     Mule Deer       35.0 mph
                        Jackal       35.0 mph
                      Reindeer       32.0 mph
                       Giraffe       32.0 mph
             White-Tailed Deer       30.0 mph
                       Warthog       30.0 mph
                  Grizzly Bear       30.0 mph
                Cat (domestic)       30.0 mph
                         Human       27.9 mph
                      Elephant       25.0 mph
             Black Mamba Snake       20.0 mph
          Six-Lined Racerunner       18.0 mph
                   Wild Turkey       15.0 mph
                      Squirrel       12.0 mph
                Pig (domestic)       11.0 mph
                       Chicken        9.0 mph
     Spider (Tegenaria atrica)        1.2 mph
                Giant Tortoise        0.2 mph
              Three-Toed Sloth        0.1 mph
                  Garden Snail        0.0 mph
Fastest animal:  Cheetah
Slowest animal:  Garden Snail
Closest to 0  miles/hour: Garden Snail 0.03 mph
Closest to 3  miles/hour: Spider (Tegenaria atrica) 1.17 mph
Closest to 6  miles/hour: Chicken 9 mph
Closest to 9  miles/hour: Chicken 9 mph
Closest to 12  miles/hour: Squirrel 12 mph
Closest to 15  miles/hour: Wild Turkey 15 mph
Closest to 18  miles/hour: Six-Lined Racerunner 18 mph
Closest to 21  miles/hour: Black Mamba Snake 20 mph
Closest to 24  miles/hour: Elephant 25 mph
Closest to 27  miles/hour: Human 27.89 mph
Closest to 30  miles/hour: Cat (domestic) 30 mph
Closest to 33  miles/hour: Giraffe 32 mph
Closest to 36  miles/hour: Whippet 35.5 mph
Closest to 39  miles/hour: Greyhound 39.35 mph
Closest to 42  miles/hour: Gray Fox 42 mph
Closest to 45  miles/hour: Cape Hunting Dog 45 mph
Closest to 48  miles/hour: Quarter Horse 47.5 mph

• Unfortunately all I can reassemble from the pieces of paper I could get back from the tiger's claws is this:

animalSpeed = """Cheetah	70
Pronghorn Antelope	61
Wildebeest	50
Lion	50
Thomson's Gazelle	50

Spider (Tegenaria atrica)	1.17
Giant Tortoise	0.17
Three-Toed Sloth	0.15
Garden Snail	0.03"""

class AnimalList:
    def __init__( self ):
        self.List = []

    def append( self, animal, speed):
        self.List.append( [                         ] )

    def get( self, index ):
        if 0 <= index < len( self.List ):
            speed, animal = self.List[ index ]
            return animal, speed
        return None, None

    def size( self ):
        return len( self.List )
    
    def sort( self ):
        ...

    def reverse( self ):
        self.List.reverse()

    def getFastest( self ):
        self.sort()
        if len( self.List )> 0:
            speed, animal = self.List[ -1 ] 
            return animal, speed
        return None, None

    def topN( self, n ):
        return self.List[-n: ]

    def closestInSpeedTo( self, targetSpeed ):
        if len( self.List )==0:
            return None, None
        closestSpeed, closestAnimal = self.List[0]
        for speed, animal in self.List:
            if abs( targetSpeed - closestSpeed ) > abs( targetSpeed - speed ):
                closestSpeed  = speed
                closestAnimal = animal
        return closestAnimal, closestSpeed

def main():
    animals = AnimalList()
    
    for line in animalSpeed.split( '\n' ):
        words = line.split()
        speed = 
        animal = 
        animals.append( animal, speed )

    for i in range( animals.size() ):
        animal, speed = animals.get( i )
        print( "%30s %10.1f mph" % (animal, speed ) )

    
    animal, speed = animals.getSlowest()
    print( "Slowest animal: ", animal )

    for target in range( 0, 50, 3 ):
        animal, speed = animals.closestInSpeedTo( target )
        print( "Closest to", target," miles/hour:", animal, speed, "mph" )
        
    

main()

• Figure out what code is missing so that the output of your program matches exactly the output shown above.

Submission

• call your program hw10d.py and submit it as illustrated in Problem 1 above.

...