Homework 12: Population Density

Objective: To write a program to select population density data from a text file

Write a program that reads this text file of population data on all the countries of the world with over 1 million people (sorted by population) (copied from Wikipedia (data from 2018)). Your program should output a file in the same format as this one, but showing only the countries with population density higher than the amount entered by the user. For example:

[cpersiko@fog cs110a]$ python3 popDensity.py.txt
This program saves a file containing data on all the countries with population density above a specified number.
Please enter population density in people / square kilometer: 300
The file 'HighDensity.csv' has been saved with the list of all countries with population density above 300.0

[cpersiko@fog cs110a]$ cat HighDensity.csv 
Country,Population,Area,Density
 India,1354051854,3287240,364
 Bangladesh,164994076,147570,1118
 Japan,127387000,377873,337
 South Korea,48456369,99538,487
 Taiwan(China),23069345,35980,639
 Sri Lanka,20238000,65610,308
 Netherlands,17310000,41526,417
 Belgium,10827519,30528,355
 Haiti,10033000,27750,362
 Rwanda,9998000,26338,380
 Israel,7697600,20770,371
 Hong Kong (China),7347000,1104,6349
 Singapore,5612300,719.9,7796
 Lebanon,4224000,10452,404
 Palestinian Authority (disputed),4100000,6020,681
 Puerto Rico (US),3982000,8875,449
 Mauritius,1288000,2040,631
 Bahrain,1234596,750,1646
 
[cpersiko@fog cs110a]$ python3 popDensity.py.txt
This program saves a file containing data on all the countries with population density above a specified number.
Please enter population density in people / square kilometer: 500
The file 'HighDensity.csv' has been saved with the list of all countries with population density above 500.0

[cpersiko@fog cs110a]$ cat HighDensity.csv 
Country,Population,Area,Density
 Bangladesh,164994076,147570,1118
 Taiwan(China),23069345,35980,639
 Hong Kong (China),7347000,1104,6349
 Singapore,5612300,719.9,7796
 Palestinian Authority (disputed),4100000,6020,681
 Mauritius,1288000,2040,631
 Bahrain,1234596,750,1646
[cpersiko@fog cs110a]$ 

Hints and Rules

• Notice that the first line of this particular file is a header line, with descriptive information about each piece of data. Make sure your program handles this line separately from the rest (as it has no numbers in it), and include it in the file you output.
• To split a comma-separated line of text (a string) into an array, use the string.split(",") function. The parameter indicates which character splits the string into elements.
• Your program should have at least 2 functions, including a main() function (no global variables or global code other than a call to main within an if-statement)
• Every function (except main) needs to have a comment in a triple-quoted string at the beginning, briefly explaining what it does.
• As with every assignment, you must write all the code yourself. Do not copy any code other people have written. If you use any Python features we haven't covered in class then the graders will search the internet for that code, to make sure you didn't copy it from a web site.
• Make sure to put a comment at the top of your program with your name, the name of this assignment and class (110A Homework 12), and a brief description of what the program does.
• Make sure to submit your homework using Canvas.