Question

23.2 PROJECT 2 : Data Visualization using LOOPS (python)

This program will display a set of authors and the number of novels written by each author in both a table and a histogram. You will ask the user for all of the information. Using what you learned about incremental development, use the following approach to create your program:

1. Prompt the user for the information about the table. First, ask for the title of this data set by prompting the user for a title for data. Output the title.
   
   Ex:

Enter a title for the data:
Number of Novels Authored
You entered: Number of Novels Authored

2. The table will have two columns; one for the authors and one for the number of novels. Prompt the user for the headers of two columns of the table. Output the column headers.
   
   Ex:

Enter the column 1 header:
Author name
You entered: Author name

Enter the column 2 header:
Number of novels
You entered: Number of novels

3. Prompt the user for data points. Data points must be in this format: string, int, representing the author and the number of novels written by the author. Store the information before the comma into a string variable and the information after the comma into an integer. The user will enter -1 when they have finished entering data points. Output the data points. Store the string components of the data points in a list of strings. Store the integer components of the data points in a list of integers.
   
   Ex:

Enter a data point (-1 to stop input):
Jane Austen, 6
Author: Jane Austen
Number of Novel(s): 6

4. Perform error checking for the data point entries as follows:

• If entry has no comma and is not -1
• Output: Error: No comma in string.

If the error occurs, output the appropriate error message and prompt again for a valid data point. You can assume that if a comma is present, then the data point is entered correctly.
Ex:

Enter a data point (-1 to stop input):
Ernest Hemingway 9
Error: No comma in string.

Enter a data point (-1 to stop input):
Ernest Hemingway, 9
Author: Ernest Hemingway
Number of Novel(s): 9

5. Output the information in a formatted table. The title is right justified with a minimum field width value of 33. Column 1 has a minimum field width value of 20. Column 2 has a minimum field width value of 23.
   
   Ex:

        Number of Novels Authored
Author name         |       Number of novels
--------------------------------------------
Jane Austen         |                      6
Charles Dickens     |                     20
Ernest Hemingway    |                      9
Jack Kerouac        |                     22
F. Scott Fitzgerald |                      8
Mary Shelley        |                      7
Charlotte Bronte    |                      5
Mark Twain          |                     11
Agatha Christie     |                     73
Ian Flemming        |                     14
J.K. Rowling        |                     14
Stephen King        |                     54
Oscar Wilde         |                      1

6. Output the information as a formatted histogram. Each name is right justified with a minimum field width value of 20.
   
   Ex:

         Jane Austen ******
     Charles Dickens ********************
    Ernest Hemingway *********
        Jack Kerouac **********************
 F. Scott Fitzgerald ********
        Mary Shelley *******
    Charlotte Bronte *****
          Mark Twain ***********
     Agatha Christie *************************************************************************
        Ian Flemming **************
        J.K. Rowling **************
        Stephen King ******************************************************
         Oscar Wilde *

For this project, you can assume that the user will not enter duplicate author names.

Answer 1

PYTHON CODE:

# getting title from the user
title = input('Enter a title for the data:\n')
print('You entered: %s' % title)

# getting header1
header1 = input('\nEnter the column1 header:\n')
print('You entered: %s' % header1)

# getting header2
header2 = input('\nEnter the column2 header:\n')
print('You entered: %s' % header2)

# list to store the authors and number of novels
authors=[]
novels=[]

# infinite looping
while True:

    # getting input from the user
    data = input('\nEnter a data point(-1 to stop input):\n')

    # checking for valid input
    if not ',' in data and data != '-1':
        print('\nOutput: Error. No comma in string.\n')
        continue

    # breaking from the loop
    if data == '-1':
        break

    # printing the user input
    print(data)
    t=data.split(',')
    print('Author: %s' % t[0])
    print('Number of Novel(s): %s' % t[1])

    # adding the details to the list
    authors.append(t[0])
    novels.append(int(t[1]))

# printing the table headers
print("{0:>33s}".format(title))
print('{0:<20s}|{1:>23s}'.format(header1,header2))

# printing the table
for author,novel in zip(authors,novels):
    print('{0:<20s}|{1:>23d}'.format(author,novel))

print('\n')

# printing the histogram
for author,novel in zip(authors,novels):
    print('{0:>20s} '.format(author),end='')

    for i in range(novel):
        print('*',end='')
    print()
  

SCREENSHOT FOR CODING:

SCREENSHOT FOR OUTPUT: