Answer to Question #239777 in Python for prosper2000

Question

1. Copy the countdown function from Section 5.8 of your textbook.

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.
Output for the following input: a positive number, a negative number, and zero.
An explanation of your choice for what to call for input of zero.
2. Write your own unique Python program that has a runtime error.

Answer 1

def countdown(num):
    if num <= 0:
 
        print('Blastoff!')
 
    else:
 
        print(num)
 
        countdown(num-1)
 


def countup(num):
    if num >=0:
        print('Blastoff!')
    else:
 
        print(num)
 
        countup(num+1)
 


n=int(input())


if n>0:
    print(countdown(n))


elif n<0:
    print(countup(n))


elif n==0:
    print(countup(n))