Python Answers

1. Consider the loop from Section 8.3 of your textbook.

prefixes = 'JKLMNOPQ'

suffix = 'ack'

for letter in prefixes:

   print(letter + suffix)

Put this code into a Python script and run it. Notice that it prints the names "Oack" and "Qack".

Modify the program so that it prints "Ouack" and "Quack" but leaves the other names the same.

Include the modified Python code and the output in your submission.

2. Give at least three examples that show different features of string slices. Describe the feature illustrated by each example. Invent your own examples. Do not copy them for the textbook or any other source.

Armstrong numbers between two intervals

Write a program to print all the Armstrong numbers in the given range A to B(including A and B). An N-digit number is an Armstrong number if the number equals the sum of the Nth power of its digit.

Input

The first line has an integer A.

The second line has an integer B.

Output

Print all Armstrong numbers separated by a space.

If there are no Armstrong numbers in the given range,print -1.

Sample Input 1

1

3

Sample Input 1

1 2 3

Sample Input 2

10

15

Sample Input 2

-1

call this function

def test_sqrt():

a = 1

while a < 26:

print('a =', a,'| my_sqrt(a) =',my_sqrt(a),'| math.sqrt(a) =', math.sqrt(a),'| diff =', abs(math.sqrt(a)-my_sqrt(a)))

a = a + 1

return 0

Student ID Map

you are given a sequence of student names Ni and their ids Di(corresponding to the student at the same index in Ni).

Write a program to print the student name and his ID from Ni and Di in alphabetical order of the name.

Explanation

For Example, if the given student names sequence and IDs sequenceare the following.

Anand,Ramesh,Kiran

ID102, ID101, ID100

Write a function named test_sqrt that prints a table like the following using a while loop, where "diff" is the absolute value of the difference between my_sqrt(a) and math.sqrt(a). 

a = 1 | my_sqrt(a) = 1 | math.sqrt(a) = 1.0 | diff = 0.0

a = 2 | my_sqrt(a) = 1.41421356237 | math.sqrt(a) = 1.41421356237 | diff = 2.22044604925e-16

a = 3 | my_sqrt(a) = 1.73205080757 | math.sqrt(a) = 1.73205080757 | diff = 0.0

a = 4 | my_sqrt(a) = 2.0 | math.sqrt(a) = 2.0 | diff = 0.0

a = 5 | my_sqrt(a) = 2.2360679775 | math.sqrt(a) = 2.2360679775 | diff = 0.0

a = 6 | my_sqrt(a) = 2.44948974278 | math.sqrt(a) = 2.44948974278 | diff = 0.0

a = 7 | my_sqrt(a) = 2.64575131106 | math.sqrt(a) = 2.64575131106 | diff = 0.0

a = 8 | my_sqrt(a) = 2.82842712475 | math.sqrt(a) = 2.82842712475 | diff = 4.4408920985e-16

a = 9 | my_sqrt(a) = 3.0 | math.sqrt(a) = 3.0 | diff = 0.0 

Modify your program so that it outputs lines for a values from 1 to 25 instead of just 1 to 9. 

for i in displayList:
    print(i[0])
    #loop through displayList
    for i in range(0,len(displayList)):
        #Test if the fist item in the current sub-list contains the text "Price Level
        #Tip: Remeber that each sub-list is a (displayList). So you have
        #       to access its items via displayList followed by TWO indexes.
        ......
            #Extract the second item from the currnet sub-list into variable called priceLevel
        priceLevel = ...
        #Test if priceLevel is between previousPrice and currentPrice OR
        #        priceLevel == previousPrice OR
        #        priceLevel == currentPrice
        if....

        :
            #Sound the alarm. Pass in the frequency and duration.
            if self.__currentPrice > self.__previousPrice:
                frequency = 800
                duration = 700
            else:
                frequency = 400
                duration = 700
            winsound.Beep(frequency, duration)

            #Print the text 'Alarm' with a green background color, so that the user
            #can go back and check when the alarm was sounded.
            ...

4. Negative Fusion

As I've said before, there are three types of numbers; the positive, the zero, and the negative ones. Today, we shall pay attention only to the negative ones now. Make a loop that will accept random decimal/float numbers. When the user inputs 0, the loop will terminate and then output the sum of all negative numbers inputted in 3 decimal places.

Let's code this.

Input

Multiple lines containing a decimal.

2. 4434

-1.3433

-2.444

6.432

Output

A line containing a decimal with three decimal places.

-3.787