Question

1. Write a function printTwoLargest() that inputs an arbitrary number of positive numbers from the user. The input of numbers stops when the first negative or zero value is entered by the user. The function then prints the two largest values entered by the user. If no positive numbers are entered a message to that effect is printed instead of printing any numbers. If only one number is inputted, only the largest is printed out (see 2^nd example below). Sample output:

>>> printTwoLargest()

Please enter a number: 12

Please enter a number: 99.9

Please enter a number: 4.5

Please enter a number: 77

Please enter a number: 0

The largest is 99.9

The second largest is 77

>>> printTwoLargest()

Please enter a number: 23.2

Please enter a number: -99

The largest is 23.2

>>> printTwoLargest()

Please enter a number: -9

No positive numbers were entered

>>>

1. Test your code by downloading the file lab1TEST.py in the same working folder and add the following code to the bottom of your lab1.py module. Run and fix errors before you submit.

if __name__=='__main__':
    import doctest
    print( doctest.testfile( 'lab1TEST.py' ))

use puthon 3.7

Answer 1

If you need any corrections/clarifications kindly comment.

Please give a Thumps Up if you like the answer.

Program

def printTwoLargest(list1):
    largest = list1[0]
    largest2 = None
  
    for item in list1[1:]:    
        if item > largest:
            largest2 = largest
            largest = item
        elif largest2 == None or largest2 < item:
            largest2 = item
      
            
    print("The largest is:", largest)
    print("The second largest is:", largest2)



# Driver Code
numList = []
num = 0

while True:
        num = float(input('Please enter a number: '))
        if num >0:
            numList.append(num)
        else:
            break
if len(numList)==0:
    print("No positive numbers were entered")
elif len(numList)==1:
    print("The largest is",numList[0])
else:
    printTwoLargest(numList)

Output

>>>
=============== RESTART: /home/user/PythonPrograms/largest.py ===============
Please enter a number: 12
Please enter a number: 99.9
Please enter a number: 4.5
Please enter a number: 77
Please enter a number: 0
The largest is: 99.9
The second largest is: 77.0
>>>
=============== RESTART: /home/user/PythonPrograms/largest.py ===============
Please enter a number: 23.2
Please enter a number: -99
The largest is 23.2
>>>
=============== RESTART: /home/user/PythonPrograms/largest.py ===============
Please enter a number: -9
No positive numbers were entered
>>>

Screenshot

def printTwoLargest(listi): largest = listi[0] largest2 = None for item in list1[1:]: if item > largest: largest2 = largest largest = item elif largest2 == None or largest2 < item: largest2 = item print("The largest is:", largest) print("The second largest is:", largest2) # Driver Code numList = [] num = 0 while True: num = float(input('Please enter a number: ')) if num >: numList.append(num) else: break if len(numList)==0: print("No positive numbers were entered") elif len(numList)==1: print("The largest is", numList[0]) else: printTwoLargest(numList)