Python Answers

Write a program with loops that prints the square of each number from 20 up to 220.

Output Segment

Square of 20 = 400

Square of 21 = 441

Square of 22 = 484

Square of 23 = 529

Square of 24 = 576

:

:

Square of 220 = 48400

Write a program with loops that compute the sum of all squares between 1 and 100 

(inclusive).

Output

Sum of all squares from 1 to 100 (inclusive) = 338350

Write programs with loops that compute the sum of all even numbers between 2 and 100

(inclusive).

Output

Sum of all even numbers from 2 - 100 = 2550

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Answers><span itemprop="name">Programming &amp; Computer Science</span>>Python

Write a Python program that gets a number using keyboard input. (Remember to use input for Python 3 but raw_input for Python 2.)

If the number is positive, the program should call countdown. If the number is negative, the program should call countup. Choose for yourself which function to call (countdown or countup) for input of zero.

Provide the following.

• An explanation of your choice for what to call for input of zero.

At the school library, there is a need for a new library management system. One of the basic requirements of the system is to keep track of which books are in the library and which ones have been issued / checked-out by students.

Using the above management system, you are required to help the school answer the below questions:

1.   Which three books have been issued the greatest number of times?

2.   Which books do not have any more copies left in the library (all copies have been issued)?

3.   Find out if a particular book is available in the library based on the book id.

4.   Out of the entire set of books in the library, list the books that have never been checked out by students?

5.   Print a list of all the books and available copies.

1. Copy the countdown function from below.

def countdown(n):

   if n <= 0:

     print('Blastoff!')

   else:

     print(n)

     countdown(n-1)

Write a new recursive function countup that expects a negative argument and counts “up” from that number. Output from running the function should look something like this:

>>> countup(-3)

-3

-2

-1

Blastoff!

Write a Python program that gets a number using keyboard input. (Remember to use input for Python 3 but raw_input for Python 2.)

If the number is positive, the program should call countdown. If the number is negative, the program should call countup. Choose for yourself which function to call (countdown or countup) for input of zero.

Provide the following.

• Output for the following input: a positive number, a negative number, and zero.

1. Copy the countdown function from below.

def countdown(n):

   if n <= 0:

     print('Blastoff!')

   else:

     print(n)

     countdown(n-1)

Write a new recursive function countup that expects a negative argument and counts “up” from that number. Output from running the function should look something like this:

>>> countup(-3)

-3

-2

-1

Blastoff!

Write a Python program that gets a number using keyboard input. (Remember to use input for Python 3 but raw_input for Python 2.)

If the number is positive, the program should call countdown. If the number is negative, the program should call countup. Choose for yourself which function to call (countdown or countup) for input of zero.

Provide the following.

• The code of your program.

Given a string, write a program to print a secret message that replaces characters with numbers 'a' with 1, 'b' with 2, ..., 'z' with 26 where characters are separated by '-'.

Note: You need to replace both uppercase and lowercase characters. You can ignore replacing all characters that are not letters.

abcdefghij12345678910

klmnopqr1112131415161718

stuvwxyz1920212223242526

For example, if the given input is "python", "p" should replaced with "16", similarly"y" with "25","t" with "20","h" with "8","o" with "15","n" with "14". So the output should be "16-25-20-8-15-14".

Sample Input 1

python

Sample Output 1

16-25-20-8-15-14

Sample Input 2

Foundations

Sample Output 2

6-15-21-14-4-1-20-9-15-14-19

Sum of Prime Numbers In the Input

Given a list of integers, write a program to print the sum of all prime numbers in the list of integers.

Note: One is neither prime nor composite number.Input

The input will be a single line containing space-separated integers..Output

The output should be a single line containing the sum of all prime numbers from 1 to N.Explanation

For example, if the given list of integers are

2 4 5 6 7 3 8

As 2, 3, 5 and 7 are prime numbers, your code should print the sum of these numbers. So the output should be 17.

Sample Input 1

2 4 5 6 7 3 8

Sample Output 1

17

Sample Input 2

65 87 96 31 32 86 57 69 20 42

Sample Output 2

31