Difference between revisions of "CSC111 Homework"

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==Your Assignment==
 
==Your Assignment==
−
* Your assignment is to use the program below as a starting point.  You will call it hw7.py.
+
* What I have done is taken the code of the program above and rewritten it using functions.  I have basically moved statements from the main program into functions, so that the work performed by the second program is ''identical'' to the work performed by the first program.
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* You cannot change any of the code below, except add statements inside the different functions.
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* I am giving you the code of the second program, except that I have removed the bodies of all the functions except '''main()'''.
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* You can figure out what the functions do because the main() function is complete, and is given to you in its entirety.
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* Your job is to reconstruct all the functions (except '''main()''', of course, which is complete).
−
* The only statements for you to add are '''inside''' the functions '''removeHeader( )''', '''presName()''', '''reworkDate()''', '''printPresidency()''', and '''printAll()'''.
+
* The output of your program, with the functions, should be ''exactly'' the same as the output of the first program.
 
* You cannot modify '''main()'''.  It is complete and works fine.
 
* You cannot modify '''main()'''.  It is complete and works fine.
 
* You have to figure out what the functions do, and what they return.
 
* You have to figure out what the functions do, and what they return.
−
* The two programs, the one above, and yours, must perform the same work, and output the same information.
+
* Make sure you document your code well.  Your program should have
−
 
+
** a header, with a description of what it does
 +
** headers for each function.  This can be a short 1-liner for simple functions.  Use triple-double-quotes for function headers.
 +
** comments inside the code as needed to explain what goes on with the computation.
 
<br />
 
<br />
 
<br />
 
<br />
Line 215: Line 217:
 
     ...
 
     ...
  
 +
 +
def main():
 +
    # get a list of individual lines, one president per line
 +
    lines = presidents.split( '\n' )
 +
 +
    # remove the header
 +
    lines = removeHeader( lines )
 +
   
 +
    # treat each president, one at a time
 +
    for line in lines:
 +
        # get the different fields
 +
        presidency ,president ,wikipediaEntry, tookOffice ,leftOffice ,party ,portrait, thumbnail, homeState = line.split( ',' )
 +
 +
        # rework the president's name
 +
        name = presName( president )
 +
 +
        # replace number month by 3-letter month, and return year separately.
 +
        tookOffice, year1 = reworkDate( tookOffice )
 +
   
 +
        # same work with leftOffice, if date is "Incumbent" no processing done
 +
        leftOffice, year2 = reworkDate( leftOffice )
 +
           
 +
        printAll( presidency, name, tookOffice, leftOffice, year1, year2 )
 +
 +
       
 +
main()
 +
 +
</source>
 +
 +
<br />
 +
 +
==Submission==
 +
 +
* Submit your program from beowulf using the command
 +
 +
  rsubmit hw7 hw7.py
 +
 +
 +
:or using the http://cs.smith.edu/~111a/submit7.htm form.
 +
<br />
 +
<br />
 +
<br />
 +
<br />
 +
<br />
 +
<br />
 +
<br />
 +
[[Category:CSC111]][[Category:Python]][[Category:Homework]]
 +
<onlydft>
 +
<source lang="python">
 +
 +
 +
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"""
 +
 +
monthsTable = [ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" ]
 +
 +
 +
def removeHeader( lines ):
 +
    header = lines[0]
 +
    lines = lines[1:]
 +
    return lines
 +
 +
def presName( president ):
 +
        presidentWords = president.split( )
 +
        name = presidentWords[-1] + ', ' + ' '.join( presidentWords[0:-1] )
 +
        return name
 +
 +
def reworkDate( date ):
 +
        # replace numeric month by 3-letter month
 +
        day, month, year1 = date.split( '/' )
 +
        # remove leading 0 from month
 +
        if month[0] == '0':
 +
              month = month[1]
 +
        # transform it into an integer to use it as an index in monthsTable
 +
        month = eval( month )
 +
 +
        # if month is 1, get monthsTable[0], which is "Jan".  Same for 2, get "Feb", etc.
 +
        month = monthsTable[ month -1 ]
 +
 +
        # put back together tookOffice date
 +
        date = " ".join( [ day, month, year1 ] )
 +
        return date, year1
 +
 +
def printPresidency( presidency ):
 +
        print( "%2s" % presidency, end="" )
 +
        if presidency in ['1', '21', '31', '41']:
 +
            print( "st President: ", end="" )
 +
        elif presidency in ['2', '22', '32', '42']:
 +
            print( "nd President: ", end="" )
 +
        elif presidency in ['3', '23', '33', '43']:
 +
            print( "rd President: ", end="" )
 +
        else:
 +
            print( "th President: ", end="" )
 +
 +
def printAll( presidency, name, tookOffice, leftOffice, year1, year2 ):
 +
        # display selected information, nicely formatted
 +
        printPresidency( presidency )
 +
 +
        # president's name
 +
        print( "%-30s" % (name+','), end="" )
 +
 +
        # took office...
 +
        print( " took office on %11s" % tookOffice, sep="", end="" )
 +
 +
        # left office...
 +
        if leftOffice.strip() == "Incumbent":
 +
            print( ", incumbent" )
 +
        else:
 +
            print( ", left office on %11s" % leftOffice, ": ", eval( year2 )-eval( year1 ), "-year presidency.", sep="" )
 +
        print()
  
 
def main():
 
def main():
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main()
 
main()
−
 
 
</source>
 
</source>
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+
</onlydft>
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<br />
 
−
<br />
 
−
<br />
 
−
[[Category:CSC111]][[Category:Python]][[Category:Homework]]
 

Latest revision as of 23:11, 1 November 2011

--D. Thiebaut 22:30, 1 November 2011 (EDT)

This assignment is due on the evening of Nov. 8, at midnight.



Functions

  • Take the code below and make it a program. Run it and observe its output. 


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"""

monthsTable = [ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" ]

def main():
    # get a list of individual lines, one president per line
    lines = presidents.split( '\n' )

    # remove the header
    header = lines[0]
    lines = lines[1:]

    # treat each president, one at a time
    for line in lines:
        # get the different fields
        presidency ,president ,wikipediaEntry, tookOffice ,leftOffice ,party ,portrait, thumbnail, homeState = line.split( ',' )

        # rework the president's name
        presidentWords = president.split( )
        name = presidentWords[-1] + ', ' + ' '.join( presidentWords[0:-1] )

        # replace numeric month by 3-letter month
        day, month, year1 = tookOffice.split( '/' )
        # remove leading 0 from month
        if month[0] == '0': 
              month = month[1]
        # transform it into an integer to use it as an index in monthsTable
        month = eval( month )

        # if month is 1, get monthsTable[0], which is "Jan".  Same for 2, get "Feb", etc.
        month = monthsTable[ month -1 ]

        # put back together tookOffice date
        tookOffice = " ".join( [ day, month, year1 ] )

        # same work with leftOffice, if not "Incumbent" 
        if leftOffice.strip() != "Incumbent":
            day, month, year2 = leftOffice.split( '/' )
            # remove leading 0 from month
            if month[0] == '0': month = month[1]
            # transform to a number that can be used as index in monthsTable
            month = eval( month )
            # if month is 1, get monthsTable[0], which is "Jan".  Same for 2, get "Feb", etc.
            month = monthsTable[ month -1 ]
            leftOffice = " ".join( [ day , month, year2 ] )

        
        # display selected information, nicely formatted
        print( "%2s" % presidency, end="" )
        if presidency in ['1', '21', '31', '41']:
            print( "st President: ", end="" )
        elif presidency in ['2', '22', '32', '42']:
            print( "nd President: ", end="" )
        elif presidency in ['3', '23', '33', '43']:
            print( "rd President: ", end="" )
        else:
            print( "th President: ", end="" )

        # president's name
        print( "%-30s" % (name+','), end="" )

        # took office...
        print( " took office on %11s" % tookOffice, sep="", end="" )

        # left office...
        if leftOffice.strip() == "Incumbent":
            print( ", incumbent" )
            continue

        print( ", left office on %11s" % leftOffice, ": ", eval( year2 )-eval( year1 ), "-year presidency.", sep="" )
        print()

        
main()


Your Assignment

  • What I have done is taken the code of the program above and rewritten it using functions. I have basically moved statements from the main program into functions, so that the work performed by the second program is identical to the work performed by the first program.
  • I am giving you the code of the second program, except that I have removed the bodies of all the functions except main().
  • Your job is to reconstruct all the functions (except main(), of course, which is complete).
  • The output of your program, with the functions, should be exactly the same as the output of the first program.
  • You cannot modify main(). It is complete and works fine.
  • You have to figure out what the functions do, and what they return.
  • Make sure you document your code well. Your program should have
    • a header, with a description of what it does
    • headers for each function. This can be a short 1-liner for simple functions. Use triple-double-quotes for function headers.
    • comments inside the code as needed to explain what goes on with the computation.



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"""

monthsTable = [ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" ]


def removeHeader( lines ):
    ...

def presName( president ):
    ...

def reworkDate( date ):
    ...

def printPresidency( presidency ):
    ...

def printAll( presidency, name, tookOffice, leftOffice, year1, year2 ):
    ...


def main():
    # get a list of individual lines, one president per line
    lines = presidents.split( '\n' )

    # remove the header
    lines = removeHeader( lines )
    
    # treat each president, one at a time
    for line in lines:
        # get the different fields
        presidency ,president ,wikipediaEntry, tookOffice ,leftOffice ,party ,portrait, thumbnail, homeState = line.split( ',' )

        # rework the president's name
        name = presName( president )

        # replace number month by 3-letter month, and return year separately.
        tookOffice, year1 = reworkDate( tookOffice )
    
        # same work with leftOffice, if date is "Incumbent" no processing done
        leftOffice, year2 = reworkDate( leftOffice )
            
        printAll( presidency, name, tookOffice, leftOffice, year1, year2 )

        
main()


Submission

  • Submit your program from beowulf using the command
 rsubmit hw7 hw7.py


or using the http://cs.smith.edu/~111a/submit7.htm form.









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