CSC111 Homework 10 2011

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

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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 (this is an exception to the rule). 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 will not take point for lack of documentation. The goal here is for you to use classes and objects and make them work.
This assignment is due Dec. 6 evening, 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 window.
• 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()

• It's not documented, but 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 (or more if that makes your code simpler) to the Ball class called changeDirIfHittingWall(). This method changes the sign self.dx or self.dy when the ball hits a vertical or horizontal wall (the boundaries of the window).
• 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

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

• You cannot modify the President class.
• You can only modify the main() function.
• Make the main program output the number of democratic presidents, the number of republican presidents, and the number of "other" party presidents.

Submission

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

Problem 4

TBA