Question

python3

Design a class named Histogram to display a histogram of data. The Histogram class contains the following

• A number of instance variables/fields to store a histogram of data. You can design them by your own.
• A constructor that creates a histogram with the following
  • a list of data. It may have more than 2 columns.
  • x_width: the width of the 1st column in the horizontal histogram. The default value is 5.
  • y_width: the width of the 2nd column in the horizontal histogram. The default value is 10.
• A __str__ method that returns a nicely formatted string representation of the object.

and draw_vertical_histogram() method in the Histogram class. This method takes 3 parameters:

• x_index: The draw_vertical_histogram() function takes data according to this index to plot the x-axis of the histogram. The default value is 0.
• y_index: The draw_vertical_histogram() function takes data according to this index to plot the y-axis of the histogram.The default value is 1.

For example, consider the following code fragment:

h2 = Histogram([['May', 3], ['Bob', 7], ['Mike', 2]])
print(h2)
h2.draw_vertical_histogram()

produces:

x_width=5 y_width=10, data=[['May', 3], ['Bob', 7], ['Mike', 2]]
     *         
     *         
     *         
     *         
*    *         
*    *    *    
*    *    *    
---------------
May  Bob  Mike 

Note: column width is specified by the value of x_width

For example:

Test	Result
h2 = Histogram([['May', 3], ['Bob', 7], ['Mike', 2]]) print(h2) h2.draw_vertical_histogram()	x_width=5 y_width=10, data=[['May', 3], ['Bob', 7], ['Mike', 2]] * * * * * * * * * * * * --------------- May Bob Mike
h2 = Histogram([['a', 2, 7], ['b', 1, 4], ['c', 8, 3]]) h2.draw_vertical_histogram(y_index=2)	* * * * * * * * * * * * * * --------------- a b c

Answer 1

If you have any doubts, please give me comment...

class Histogram:

    def __init__(self, data, x_width=5, y_width=10):

        self.data = data

        self.x_width = x_width

        self.y_width = y_width

    

    def __str__(self):

        return "x_width="+str(self.x_width)+", y_width="+str(self.y_width)+", data="+str(self.data)

    

    def draw_vertical_histogram(self, x_index=0, y_index=1):

        maximum = 0

        for d in self.data:

            if d[y_index]>maximum:

                maximum = d[y_index]

        for i in range(maximum-1, -1, -1):

            for d in self.data:

                if i<d[y_index]:

                    print('%-*s'%(self.x_width, "*"), end='')

                else:

                    print('%-*s'%(self.x_width, " "), end='')

            print()

        print('-'*(self.x_width*len(self.data)))

        for d in self.data:

            print("%-*s"%(self.x_width, d[x_index]), end='')

        print()

h2 = Histogram([['May', 3], ['Bob', 7], ['Mike', 2]])

print(h2)

h2.draw_vertical_histogram()

h2 = Histogram([['a', 2, 7], ['b', 1, 4], ['c', 8, 3]])

h2.draw_vertical_histogram(y_index=2)