Question

This program (in python) 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 program, you can assume that the user will not enter duplicate author names

Answer 1

author_name = ""

author_novels = ""

list_author_names = []

list_author_novels = []

title = input("Enter a title for the data:")

print("You entered: " + title)

column_author_name = input("Enter the column 1 header:")

print("You entered: " + column_author_name)

column_author_novles = input("Enter the column 2 header:")

print("You entered: " + column_author_novles)

def getDataPoints() :

    data_point = '0'

    try :

        while data_point != '-1' :

            valid_data_point = []

            data_point = input("Enter a data point (-1 to stop input):")

            print("You entered: " + data_point)

            if len(data_point) <= 2 and int(data_point) == -1:

                break

            

            valid_data_point = data_point.split(",")

            if len(valid_data_point) < 2 :

                print("Error: No comma in string.")

                pass

            elif len(valid_data_point) == 2:

                author_name = valid_data_point[0]

                list_author_names.append(author_name.strip())

                author_novels = valid_data_point[1]

                list_author_novels.append(author_novels.strip())

            elif len(valid_data_point) > 2 :

                pass            

    except:

        print("There is an exception")

def showAuthorInformationTable() :

    print("{0:^33}".format(title))

    print("{0:^20} | {1:^23}".format(column_author_name, column_author_novles))

    print("---------------------------------------------------------------------")

    for i in range(len(list_author_names)) :

        print("{0:^20} | {1:^23}".format(list_author_names[i], list_author_novels[i]))

def showAuthorInformationHistogram() :

    for i in range(len(list_author_names)) :

        print("{0:>30}    {1:<10}".format(list_author_names[i],int(list_author_novels[i])*"*"))

#Get Data Points from user

getDataPoints()

#Display Author information in a tabular format

showAuthorInformationTable()

#Display Author information in a histogram format

showAuthorInformationHistogram()