Difference between revisions of "CSC111 Homework 5"

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(Created page with '<bluebox> This homework assignment is due on 3/4/10 at midnight. You are encouraged to work work on this assignment in pairs. </bluebox> ==Problem #1== * Create a new program …')
 
(→‎Style)
 
(20 intermediate revisions by the same user not shown)
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<bluebox>
 
<bluebox>
−
This homework assignment is due on 3/4/10 at midnight.  You are encouraged to work work on this assignment in pairs.
+
This homework assignment is due on 3/4/10 at midnight.  You are encouraged to work on this assignment in pairs.
 
</bluebox>
 
</bluebox>
 +
 +
<br />
 +
__TOC__
 +
<br />
  
 
==Problem #1==
 
==Problem #1==
 +
[[Image:stateOfTheInternet.jpg | right | link=http://mashable.com/2010/02/26/state-of-internet/ ]]
 +
* Login to beowulf, then  get a copy of the startup program that I have created for this homework assignment:
  
−
* Create a new program in your account with the code below:
+
      getcopy hw5a.py
  
 +
* Look at the program with emacs.  You will see a very loooooonnnnng program:
 +
<br />
 +
<br />
 
<source lang="python">
 
<source lang="python">
 
.
 
.
Line 187: Line 196:
 
.
 
.
 
</source>
 
</source>
 +
<br />
 +
<br />
  
 
* Run the program, and observe its output:
 
* Run the program, and observe its output:
Line 200: Line 211:
 
...
 
...
 
</pre></code>
 
</pre></code>
−
:This data is taken from http://www.clickz.com/ and represents statistics about the world population of Internet users, and the number of Internet Service Providers dating from a few years back.
+
:This data is taken from http://www.clickz.com/ and represents statistics about the world population of Internet users, and the number of Internet Service Providers dating from a few years back.  For a fun movie made very recently with interesting statistics about the Internet, go to http://mashable.com/2010/02/26/state-of-internet/
 +
 
 +
: The original data used "NA" to indicate when data was ''Not Available'', but I have replaced the NAs with -1 to simplify sorting.
  
−
* Study the program and make sure you understand how the data is coded, and how the code works.  '''There are no new Python constructs in this code.  We have seen all the Python constructs used in this program in class or in a lab before!'''
+
* Study the program and make sure you understand how the data is coded, and how the program works.  '''There are no new Python constructs in this code.  We have seen all the Python constructs used in this program in class or in a lab before!'''
  
 
===Your assignment===
 
===Your assignment===
Line 208: Line 221:
  
 
;Question 1
 
;Question 1
−
: Add a new function that will received the ''statistics'' list as parameter and that will print the 10 top countries in the world by order of their population.  This function should be called from the '''main()''' function and should use the same format as the one shown above, i.e. with the country name listed first, then the population, then the Active users, then the users, then the ISPs.
+
: Add a new function that will receive the ''statistics'' list as parameter and that will print the top 10 countries in the world by order of their population.  This function should be called from the '''main()''' function and should use the same format as the one shown above, i.e. with the country name listed first, then the population, then the Active users, then the users, then the ISPs, but it should output a ranking on the left side, with 1 listed in the left margin of the first country, 2 listed in the left margin of the second country, until the 10th country.  Note that the number 10 has 2 digits, while 1 to 9 have only one digits.  However, the countries names and the various quantities should be listed one above the other without a jump to the right on the 10th line.
 +
 
 +
:Make sure your program does not output the complete list of the 225 countries!  This would use up too much paper when your program is graded.  All that we are interested in this assignment is a collection of short lists of "the most" countries, for various quantities.
 +
 
 +
:Make sure your program prints a title before the list of the top 10 populated countries.  Something like "Top 10 Countries ranked by population" is fine.
 +
 
 +
:Make sure you are ''efficient'' and that if you do not replicate identical code in different functions.  The purpose of a function is to encapsulate code that can be used many times in different areas.
 +
 
 +
;Question 2
 +
: Add a new function that will receive the ''statistics'' list as parameter and that will print the top 10 countries in terms of users and active users (i.e. add the number of users and the number of active users, and list the 10 countries with the largest such sums).
 +
 
 +
: As with Question 1, make sure you print at title before the liste.
 +
 
 +
; Question 3
 +
: Add a new function that will receive the ''statistics'' list as a parameter and that will print the top 10 countries in terms of the ratio of active Internet Users to population.  The first country listed should be the one with the highest percentage of active users to the total population.
 +
 
 +
: Use the same print format as explained in Question 2, including a title before the list.
 +
 
 +
;Question 4
 +
: Add a function to your program that will receive ''statistics'' as a parameter and that will print out some global statistics.
 +
:* The total world population as recorded in the list ''statistics''
 +
:* The total number of Internet users (don't worry about the -1 values.  They contribute a very tiny error in the whole computation)
 +
:* The total number of active Internet users.
 +
:* The total number of ISPs.
 +
:* The percentage of active users relative to Internet users, for the whole world.
 +
:* The percentage of Internet users relative to the wold population.
 +
 
 +
: The percentages should be printed with 2 decimal digits, and with the % sign.  For example:
 +
 
 +
        Active Internet users world-wide:  12.30%
 +
 
 +
:(Note, the % sign is a string operator.  When it appears in a string, Python thinks it is going to be used as a substitution operator.  To print a regular %-sign, just write two of them next to each other and Python will understand!)
 +
 
 +
==Style (Section added on 2/28/10)==
 +
 
 +
I will start paying more and more attention to style in this assignment as well as future ones.  Remember how the graphics.py library that we looked at in class recently was nicely organized, and easy to scan visually.
 +
 
 +
Here are some recommendations I would like you to pay close attention to.
 +
* Make sure your header is accurate and that it contains all the information required to understand what your program does.  It is a challenge to make the header short and informative, but you need to pay attention to it.  The header is the first thing somebody looking at your program will see.  '''A program is written once and read many times.'''  The header should have enough information for somebody looking for a software solution to decide if your program will be a good candidate.
 +
* Avoid using long lines, as they will wrap when the program is listed, and the wrapped lines break the structure of the program.  I have created a utility to list your program the same way the printer will, so make use of it before submitting programs and break long lines to avoid spoiling the visual understanding block structure of your program.
 +
 
 +
    listmyprogram hw5a.py
 +
 
 +
 
 +
The command above will list your program and wrap long lines. So, for example, if you see this output from '''listmyprogram'''
 +
 
 +
        #Prompt the  user to input both the grades for the midterm exam and for
 +
the final exam.
 +
        print "Please enter the grades for the midterm, followed by the final, also on
 +
e per line."
 +
 
 +
:change it to:
 +
 
 +
      # Prompt the  user to input both the grades for the midterm
 +
      # exam and for the final exam.
 +
      print "Please enter the grades for the midterm,",
 +
      print "followed by the final, also one per line."
 +
 
 +
:or to
 +
 
 +
      # Prompt the  user to input both the grades for the midterm
 +
      # exam and for the final exam.
 +
      print "Please enter the grades for the midterm," + \
 +
            "followed by the final, also one per line."
 +
 
 +
==Submission==
 +
 
 +
* Store your program in a file called hw5a.py and submit it as follows:
 +
 
 +
      submit hw5 hw5a.py
 +
 
 +
==Typical Output==
 +
Here is an example of what you should try to emulate.  This is a partial listing of the output of the solution program.  Not all the various quantities are shown, but this should give you a better idea of the output format:
 +
 
 +
<code><pre>
 +
----------------------------- Most Populated Countries -----------------------------
 +
                                                                  Active         
 +
Country                                  Population      Users      Users      ISPs
 +
China                                    1280000000  99800000        -1          3
 +
India                                    1040000000  36970000        -1        43
 +
United_States                            290340000  185550000  139520000      7000
 +
[...]
 +
Japan                                    127210000  78050000  36580000        73
 +
 
 +
 
 +
 
 +
---------------------------- Countries with most users -----------------------------
 +
                                                                  Active         
 +
Country                                  Population      Users      Users      ISPs
 +
[...]
 +
Brazil                                    182030000  22320000  10860000        50
 +
South_Korea                                42760000  31670000        -1        11
 +
 
 +
 
 +
 
 +
------------------- Countries with highest ratio of active users -------------------
 +
                                                                  Active         
 +
Country                                  Population      Users      Users      ISPs
 +
Sweden                                      8870000    6120000    4640000        29
 +
[...]
 +
Canada                                    32200000  20450000    8800000        760
 +
 
 +
---------------------------------------------------
 +
Total world population:                6264524513
 +
[...]
 +
Percentage active vs regular users          38.03%
 +
[...]
 +
</pre></code>
 +
 
 +
==Optional and Extra-Credit==
 +
 
 +
You will notice that in the typical output section above, the first three sections are printed very similarly, with the same format:
 +
* A title with dashes around it
 +
* A list of column headers
 +
* The columns of data, on 10 rows
 +
 
 +
Write your program so that each section is printed by the same function, which will receive 2 parameters:
 +
* a title (without the dashes)
 +
* a list of records (a record contains all country and numbers)
 +
 
 +
Example:
 +
 
 +
    printNice10( "Countries with highest ratio of active users", statistics )
 +
 
 +
and its output is:
 +
 
 +
<code><pre>
 +
------------------- Countries with highest ratio of active users -------------------
 +
                                                                  Active         
 +
Country                                  Population      Users      Users      ISPs
 +
Sweden                                      8870000    6120000    4640000        29
 +
[...]
 +
Canada                                    32200000  20450000    8800000        760
 +
 
 +
</pre></code>
 +
<br />
 +
<br />
 +
<br />
 +
<br />
 +
<br />
 +
<br />
 +
<br />
 +
<br />
 +
[[Category:CSC111]][[Category:Python]][[Category:Homework]]

Latest revision as of 11:54, 28 February 2010

This homework assignment is due on 3/4/10 at midnight. You are encouraged to work on this assignment in pairs.



Problem #1

StateOfTheInternet.jpg
  • Login to beowulf, then get a copy of the startup program that I have created for this homework assignment:
     getcopy hw5a.py
  • Look at the program with emacs. You will see a very loooooonnnnng program:



.

# hw5a.py
# your name 
#

statistics = [['Afghanistan', 28710000, -1, -1, 1], ['Albania', 3580000,
12000, -1, 10], ['Algeria', 32810000, 180000, -1, 2],
['Andorra', 69150, 24500, -1, 1], ['Angola', 10760000,
60000, -1, 1], ['Anguilla', 12738, 919, -1, 16],
['Antigua_and_Barbuda', 67897, 5000, -1, 16], ['Argentina',
38740000, 4650000, -1, 33], ['Armenia', 3320000, 30000, -1,
9], ['Aruba', 70844, 24000, -1, -1], ['Australia', 19730000,
13010000, 9020000, 571], ['Austria', 8180000, 4650000,
1300000, 37], ['Azerbaijan', 7830000, 25000, -1, 2],
['Bahrain', 667238, 140200, -1, 1], ['Bangladesh',
138440000, 150000, -1, 10], ['Barbados', 277264, 6000, -1,
19], ['Belarus', 10330000, 422000, -1, 23], ['Belgium',
10280000, 4870000, 1600000, 61], ['Belize', 266440, 18000,
-1, 2], ['Benin', 7040000, 25000, -1, 4], ['Bhutan',
2130000, 2500, -1, -1], ['Bolivia', 8580000, 78000, -1, 9],
['Bosnia_and_Herzegovian', 3980000, 45000, -1, 3],
['Botswana', 1570000, 33000, -1, 11], ['Brazil', 182030000,
22320000, 10860000, 50], ['Brunei', 358098, 35000, -1, 2],
['Bulgaria', 7530000, 1610000, -1, 200], ['Burkina_Faso',
13220000, 25000, -1, 1], ['Burma', 42510000, 10000, -1, 1],
['Burundi', 6090000, 6000, -1, 1], ['Cambodia', 13120000,
10000, -1, 2], ['Cameroon', 15740000, 45000, -1, 1],
['Canada', 32200000, 20450000, 8800000, 760], ['Cape_Verde',
412137, 12000, -1, 1], ['Cayman_Islands', 41934, -1, -1,
16], ['Central_African_Republic', 3680000, 2000, -1, 1],
['Chad', 9250000, 4000, -1, 1], ['Chile', 15660000, 5040000,
-1, 7], ['China', 1280000000, 99800000, -1, 3], ['Colombia',
41660000, 1870000, -1, 18], ['Comoros', 632948, 2500, -1,
1], ['Republic_of_the_Congo_Democratic', 56620000, 6000, -1,
1], ['Congo_Republic', 2950000, 500, -1, 1],
['Cook_Islands', 21008, -1, -1, 3], ['Costa_Rica', 3890000,
384000, -1, 3], ['Cote_d_Ivoire', 16960000, 70000, -1, 5],
['Croatia', 4420000, 480000, -1, 9], ['Cuba', 11260000,
120000, -1, 5], ['Cyprus', 771657, 150000, -1, 6],
['Czech_Republic', 10240000, 3530000, -1, 300], ['Denmark',
5380000, 3720000, -1, 13], ['Djibouti', 457130, 3300, -1,
1], ['Dominica', 69655, 2000, -1, 16],
['Dominican_Republic', 8710000, 186000, -1, 24],
['East_Timor', 977853, -1, -1, -1], ['Ecuador', 13710000,
328000, -1, 31], ['Egypt', 74710000, 2420000, -1, 50],
['El_Salvador', 6470000, 40000, -1, 4],
['Equatorial_Guinea', 510473, 900, -1, 1], ['Eritrea',
4360000, 10000, -1, 5], ['Estonia', 1400000, 620000, -1,
38], ['Ethiopia', 66550000, 20000, -1, 1], ['Faroe_Islands',
46345, 3000, -1, 2], ['Fiji', 856300, 15000, -1, 2],
['Finland', 5190000, 3270000, -1, 3], ['France', 60180000,
25470000, 15530000, 62], ['French_Guiana', 182917, 2000, -1,
2], ['French_Polynesia', 262125, 16000, -1, 2], ['Gabon',
1320000, 18000, -1, 1], ['Gambia', 1500000, 5000, -1, 2],
['Georgia', 4930000, 25000, -1, 6], ['Germany', 82390000,
41880000, 29520000, 200], ['Ghana', 20460000, 200000, -1,
12], ['Gilbraltar', 27776, -1, -1, 2], ['Greece', 10660000,
2710000, -1, 27], ['Greenland', 56385, 20000, -1, 1],
['Grenada', 89258, 5200, -1, 14], ['Guadeloupe', 440189,
4000, -1, 3], ['Guam', 163941, 5000, -1, 20], ['Guatemala',
13900000, 200000, -1, 5], ['Guernsey', 64818, -1, -1, -1],
['Guinea', 9030000, 15000, -1, 4], ['Guinea-Bissau',
1360000, 4000, -1, 2], ['Guyana', 702100, 95000, -1, 3],
['Haiti', 7520000, 30000, -1, 3], ['Honduras', 6660000,
40000, -1, 8], ['Hong_Kong', 7390000, 4580000, 2630000, 17],
['Hungary', 10040000, 2940000, -1, 16], ['Iceland', 200000,
198000, -1, 20], ['India', 1040000000, 36970000, -1, 43],
['Indonesia', 234890000, 12860000, -1, 24], ['Iran',
68270000, 420000, -1, 8], ['Iraq', 24680000, 12500, -1, 1],
['Ireland', 3920000, 1810000, -1, 22],
['Islas_Malvinas_(Falkland_Islands)', 2967, -1, -1, 2],
['Isle_of_Man', 74261, -1, -1, -1], ['Israel', 6110000,
3130000, 976000, 21], ['Italy', 57990000, 25530000,
15700000, 93], ['Jamaica', 2690000, 100000, -1, 21],
['Japan', 127210000, 78050000, 36580000, 73], ['Jersey',
90156, -1, -1, -1], ['Jordan', 5460000, 212000, -1, 5],
['Kazakhstan', 16760000, 100000, -1, 10], ['Kenya',
31630000, 500000, -1, 65], ['Kiribati', 98549, 1000, -1, 1],
['Kuwait', 2180000, 200000, -1, 3], ['Kyrgyzstan', 4890000,
51600, -1, -1], ['Laos', 5920000, 10000, -1, 1], ['Latvia',
2340000, 455000, -1, 41], ['Lebanon', 3720000, 300000, -1,
22], ['Lesotho', 1860000, 5000, -1, 1], ['Liberia', 3310000,
500, -1, 2], ['Libya', 5490000, 20000, -1, 1],
['Liechtenstein', 3314, -1, -1, -1], ['Lithuania', 3590000,
480000, -1, 32], ['Luxembourg', 454157, 100000, -1, 8],
['Macau', 469903, 101000, -1, 1], ['Macedonia', 2060000,
100000, -1, 6], ['Madagascar', 16970000, 35000, -1, 2],
['Malawi', 11650000, 35000, -1, 7], ['Malaysia', 23090000,
10040000, -1, 7], ['Maldives', 329684, 6000, -1, 1],
['Mali', 11620000, 30000, -1, 13], ['Malta', 400420, 59000,
-1, 6], ['Marshall_Islands', 56429, 900, -1, 1],
['Martinique', 425966, 5000, -1, 2], ['Mauritania', 2910000,
7500, -1, 5], ['Mauritius', 1210000, 158000, -1, 2],
['Mexico', 104900000, 13880000, -1, 51], ['Micronesia',
108143, 2000, -1, 1], ['Moldova', 4430000, 15000, -1, 2],
['Monaco', 32130, -1, -1, 2], ['Mongolia', 2710000, 40000,
-1, 5], ['Montserrat', 8995, -1, -1, 17], ['Morocco',
31680000, 400000, -1, 8], ['Mozambique', 17470000, 22500,
-1, 11], ['Namibia', 1920000, 45000, -1, 2], ['Nauru',
12570, -1, -1, 1], ['Nepal', 26460000, 60000, -1, 6],
['Netherlands_Antilles', 216226, 2000, -1, 6],
['New_Caledonia', 210798, 24000, -1, 1], ['New_Zealand',
3950000, 2340000, -1, 36], ['Nicaragua', 5120000, 20000, -1,
3], ['Niger', 10050000, 12000, -1, 1], ['Nigeria',
133880000, 100000, -1, 11], ['Niue', 2145, -1, -1, 1],
['Norfolk_Island', 1853, -1, -1, 2], ['North_Korea',
22460000, -1, -1, 1], ['Northern_Mariana_Islar', 80006, -1,
-1, 1], ['Norway', 4540000, 3030000, -1, 13], ['Oman',
2800000, 120000, -1, 1], ['Pakistan', 150690000, 1200000,
-1, 30], ['Palau', 19717, -1, -1, 1], ['Panama', 2960000,
45000, -1, 6], ['Papua_New_Guinea', 5290000, 135000, -1, 3],
['Paraguay', 6030000, 20000, -1, 4], ['Peru', 28400000,
4570000, -1, 10], ['Philippines', 84610000, 5960000, -1,
33], ['Pitcairn_Islands', 47, -1, -1, -1], ['Poland',
38620000, 10400000, -1, 19], ['Portugal', 10100000, 6090000,
-1, 16], ['Puerto_Rico', 3880000, 600000, -1, 76], ['Qatar',
817052, 75000, -1, 1], ['Reunion', 755171, 10000, -1, 1],
['Romania', 22270000, 4940000, -1, 38], ['Russia',
144520000, 21230000, -1, 35], ['Rwanda', 7810000, 20000, -1,
2], ['Samoa', 178173, 3000, -1, 2], ['San_Marino', 28119,
-1, -1, 2], ['Sao_Tome_and_Principe', 175883, 9000, -1, 2],
['Saudi_Arabia', 24290000, 2540000, -1, 42], ['Senegal',
10580000, 100000, -1, 1], ['Seychelles', 80469, 9000, -1,
1], ['Sierra_Leone', 5730000, 20000, -1, 1], ['Singapore',
4600000, 2750000, 956000, 9], ['Slovakia', 5430000, 1610000,
-1, 6], ['Slovenia', 1930000, 930000, -1, 11],
['Solomon_Islands', 509190, 8400, -1, 1], ['Somalia',
8020000, 200, -1, 3], ['South_Africa', 43600000, 4780000,
-1, 150], ['South_Korea', 42760000, 31670000, -1, 11],
['Spain', 40210000, 13440000, 8210000, 56], ['Sri_Lanka',
19740000, 121500, -1, 5], ['St._Kitts_and_Nevis', 38763,
2000, -1, 16], ['St._Lucia', 162157, 3000, -1, 15],
['St._Vincent_and_the_Grenadines', 116812, 3500, -1, 15],
['Sudan', 38110000, 56000, -1, 2], ['Suriname', 435449,
14500, -1, 2], ['Svalbard', 2811, -1, -1, -1], ['Swaziland',
1160000, 14000, -1, 6], ['Sweden', 8870000, 6120000,
4640000, 29], ['Switzerland', 7310000, 4600000, 3310000,
44], ['Syria', 17580000, 60000, -1, 1], ['Taiwan', 22600000,
9520000, 5000000, 8], ['Tajilistan', 6860000, 5000, -1, 4],
['Tanzania', 35920000, 300000, -1, 6], ['Thailand',
64260000, 7570000, -1, 15], ['The_Bahamas', 297477, 16900,
-1, 19], ['The_Netherlands', 16149999, 9790000, 7780000,
52], ['Togo', 5420000, 50000, -1, 3], ['Tokelau', 1418, -1,
-1, 1], ['Tonga', 108141, 1000, -1, 2],
['Trinidad_and_Tobago', 1100000, 120000, -1, 17],
['Tunisia', 9920000, 400000, -1, 1], ['Turkey', 68100000,
7270000, -1, 50], ['Turkmenistan', 4770000, 2000, -1, -1],
['Turks_and_Caicos', 19350, -1, -1, 14], ['Tuvalu', 11305,
-1, -1, 1], ['Uganda', 25630000, 60000, -1, 2], ['Ukraine',
48050000, 5278100, -1, 260], ['United_Arab_Emirates',
2480000, 900000, -1, 1], ['United_Kingdom', 60090000,
33110000, 22550000, 400], ['United_States', 290340000,
185550000, 139520000, 7000], ['Uruguay', 3410000, 600000,
-1, 14], ['Uzbekistan', 25980000, 100000, -1, 42],
['Vanuatu', 199414, 3000, -1, 1], ['Venezuela', 24650000,
2310000, -1, 16], ['Vietnam', 81620000, 400000, -1, 5],
['Virgin_Islands', 124778, 12000, -1, 50],
['Wallis_and_Futuna', 15734, -1, -1, 1], ['Western_Sahara',
261794, -1, -1, 1], ['Yemen', 19340000, 17000, -1, 1],
['Zambia', 10300000, 25000, -1, 5], ['Zimbabwe', 12570000,
100000, -1, 6]]

def prettyPrint( stats ):
    print "%-40s %10s %10s %10s %10s" % ( " ",       " ",          " ",     "Active", " " )
    print "%-40s %10s %10s %10s %10s" % ( "Country", "Population", "Users", "Users",  "ISPs" )
    for item in stats:
        ( country, population, internetUsers, activeUsers, ISPs ) = item
        print "%-40s %10d %10d %10d %10d" % ( country, population, internetUsers, activeUsers, ISPs )


def main():
    prettyPrint( statistics )


main()

.



  • Run the program, and observe its output:
                                                                   Active           
Country                                  Population      Users      Users       ISPs
Afghanistan                                28710000         -1         -1          1
Albania                                     3580000      12000         -1         10
Algeria                                    32810000     180000         -1          2
Andorra                                       69150      24500         -1          1
Angola                                     10760000      60000         -1          1
...
This data is taken from http://www.clickz.com/ and represents statistics about the world population of Internet users, and the number of Internet Service Providers dating from a few years back. For a fun movie made very recently with interesting statistics about the Internet, go to http://mashable.com/2010/02/26/state-of-internet/
The original data used "NA" to indicate when data was Not Available, but I have replaced the NAs with -1 to simplify sorting.
  • Study the program and make sure you understand how the data is coded, and how the program works. There are no new Python constructs in this code. We have seen all the Python constructs used in this program in class or in a lab before!

Your assignment

Your assignment is to add new functions to this program so that we get a finer quantitative view of the world in terms of its usage of the Internet.

Question 1
Add a new function that will receive the statistics list as parameter and that will print the top 10 countries in the world by order of their population. This function should be called from the main() function and should use the same format as the one shown above, i.e. with the country name listed first, then the population, then the Active users, then the users, then the ISPs, but it should output a ranking on the left side, with 1 listed in the left margin of the first country, 2 listed in the left margin of the second country, until the 10th country. Note that the number 10 has 2 digits, while 1 to 9 have only one digits. However, the countries names and the various quantities should be listed one above the other without a jump to the right on the 10th line.
Make sure your program does not output the complete list of the 225 countries! This would use up too much paper when your program is graded. All that we are interested in this assignment is a collection of short lists of "the most" countries, for various quantities.
Make sure your program prints a title before the list of the top 10 populated countries. Something like "Top 10 Countries ranked by population" is fine.
Make sure you are efficient and that if you do not replicate identical code in different functions. The purpose of a function is to encapsulate code that can be used many times in different areas.
Question 2
Add a new function that will receive the statistics list as parameter and that will print the top 10 countries in terms of users and active users (i.e. add the number of users and the number of active users, and list the 10 countries with the largest such sums).
As with Question 1, make sure you print at title before the liste.
Question 3
Add a new function that will receive the statistics list as a parameter and that will print the top 10 countries in terms of the ratio of active Internet Users to population. The first country listed should be the one with the highest percentage of active users to the total population.
Use the same print format as explained in Question 2, including a title before the list.
Question 4
Add a function to your program that will receive statistics as a parameter and that will print out some global statistics.
  • The total world population as recorded in the list statistics
  • The total number of Internet users (don't worry about the -1 values. They contribute a very tiny error in the whole computation)
  • The total number of active Internet users.
  • The total number of ISPs.
  • The percentage of active users relative to Internet users, for the whole world.
  • The percentage of Internet users relative to the wold population.
The percentages should be printed with 2 decimal digits, and with the % sign. For example:
       Active Internet users world-wide:  12.30%
(Note, the % sign is a string operator. When it appears in a string, Python thinks it is going to be used as a substitution operator. To print a regular %-sign, just write two of them next to each other and Python will understand!)

Style (Section added on 2/28/10)

I will start paying more and more attention to style in this assignment as well as future ones. Remember how the graphics.py library that we looked at in class recently was nicely organized, and easy to scan visually.

Here are some recommendations I would like you to pay close attention to.

  • Make sure your header is accurate and that it contains all the information required to understand what your program does. It is a challenge to make the header short and informative, but you need to pay attention to it. The header is the first thing somebody looking at your program will see. A program is written once and read many times. The header should have enough information for somebody looking for a software solution to decide if your program will be a good candidate.
  • Avoid using long lines, as they will wrap when the program is listed, and the wrapped lines break the structure of the program. I have created a utility to list your program the same way the printer will, so make use of it before submitting programs and break long lines to avoid spoiling the visual understanding block structure of your program.
    listmyprogram hw5a.py


The command above will list your program and wrap long lines. So, for example, if you see this output from listmyprogram 

       #Prompt the  user to input both the grades for the midterm exam and for 
the final exam.
       print "Please enter the grades for the midterm, followed by the final, also on
e per line."
change it to:
      # Prompt the  user to input both the grades for the midterm 
      # exam and for the final exam.
      print "Please enter the grades for the midterm,",
      print "followed by the final, also one per line."
or to
      # Prompt the  user to input both the grades for the midterm 
      # exam and for the final exam.
      print "Please enter the grades for the midterm," + \
            "followed by the final, also one per line."

Submission

  • Store your program in a file called hw5a.py and submit it as follows:
     submit hw5 hw5a.py

Typical Output

Here is an example of what you should try to emulate. This is a partial listing of the output of the solution program. Not all the various quantities are shown, but this should give you a better idea of the output format: 

----------------------------- Most Populated Countries -----------------------------
                                                                   Active           
Country                                  Population      Users      Users       ISPs
China                                    1280000000   99800000         -1          3
India                                    1040000000   36970000         -1         43
United_States                             290340000  185550000  139520000       7000
[...]
Japan                                     127210000   78050000   36580000         73



---------------------------- Countries with most users -----------------------------
                                                                   Active           
Country                                  Population      Users      Users       ISPs
[...]
Brazil                                    182030000   22320000   10860000         50
South_Korea                                42760000   31670000         -1         11



------------------- Countries with highest ratio of active users -------------------
                                                                   Active           
Country                                  Population      Users      Users       ISPs
Sweden                                      8870000    6120000    4640000         29
[...]
Canada                                     32200000   20450000    8800000        760

---------------------------------------------------
Total world population:                 6264524513
[...]
Percentage active vs regular users           38.03%
[...]

Optional and Extra-Credit

You will notice that in the typical output section above, the first three sections are printed very similarly, with the same format:

  • A title with dashes around it
  • A list of column headers
  • The columns of data, on 10 rows

Write your program so that each section is printed by the same function, which will receive 2 parameters:

  • a title (without the dashes)
  • a list of records (a record contains all country and numbers)

Example: 

    printNice10( "Countries with highest ratio of active users", statistics )

and its output is: 

------------------- Countries with highest ratio of active users -------------------
                                                                   Active           
Country                                  Population      Users      Users       ISPs
Sweden                                      8870000    6120000    4640000         29
[...]
Canada                                     32200000   20450000    8800000        760









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