Question

5. You have the following list stored in variable myList [ 3, 7, -1, 2, -10, 6, 8) i. Write a program that creates a new list, with the same numbers as mylist, apart from any negative numbers, which should be removed. Although you are using mylist as an example, it should work for any list of numbers. ii. Now adjust your program so that instead of deleting them, any negative numbers are replaced with a zero.

require python

Answer 1

i)

def changeMyList(myList):
    #this function removes all negetives from myList
    modifiedMyList=[]       #resultant modified list of myList
    for item in myList:             #iterate over MyList
        if item>=0:                  #if element is not negetive the append to result
            modifiedMyList.append(item)
    #return result
    return modifiedMyList

#test-1
myList= [1,2,-3,-4,5,-6]

print("before:",myList,'\tAfter:',changeMyList(myList))

#test-2
myList= [0,3,4,5,-6]
print("before:",myList,'\tAfter:',changeMyList(myList))

aabove screenshot is for reference

before: [1, 2, -3, -4, 5, -6] After: [1, 2, 5] before: [0, 3, 4, 5, -6] After: [0, 3, 4, 5] def changeMyList(myList): #this function removes all negetives from myList modifiedMyList=[] #resultant modified list of my List for item in myList: #iterate over MyList if item>=0: #if element is not negetive the append to result modifiedMyList.append(item) #return result return modifiedMyList #test-1 myList= [1, 2, 3, 44,5,-6] print("before",myList,'\tAfter:', changeMyList(myList)) #test-2 myList= [0,3,4,5,-6] print("before",myList,'\tAfter:', changeMyList(myList))

ii).

def changeMyListModified(myList):
    #this function removes all negetives from myList and add zero instead of negetive numbers
    modifiedMyList=[]       #resultant modified list of myList
    for item in myList:             #iterate over MyList
        if item>=0:                  #if element is not negetive the append to result
            modifiedMyList.append(item)
        else:
            modifiedMyList.append(0)    #for negetive append zero to result
    #return result
    return modifiedMyList

#test-1
myList= [3,7,-1,2,-10,6,8]

print("before:",myList,'\tAfter:',changeMyListModified(myList))

#test-2
myList= [0,3,4,5,-6]
print("before:",myList,'\tAfter:',changeMyListModified(myList))

above screen shot is for reference which includes code and ouput(right side)

1 before: (3, 7, -1, 2, -10, 6, 8] After: [3, 7, 0, 2, 0, 6, 8] before: [0, 3, 4, 5, -6] After: [0, 3, 4, 5, 0] 4 2- def changeMyList Modified(myList): 3 #this function removes all negetives from myList and add zero instead of negetive numbers modifiedMyList=[] #resultant modified list of my List 5 for item in myList: #iterate over MyList if item>=0 #if element is not negetive the append to result 7 modifiedMyList.append(item) 8 - else: 9 modifiedMyList.append(0) #for negetive append zero to result 10 #return result 11 return modifiedMy List 12 13 #test-1 14 myList= [3,7,-1,2,- 10,6,8] 15 16 print("before", myList,'\tAfter:', changeMyListModified(myList)) 17 18 #test-2 19 myList= [0,3,4,5,-6] 20 print("before", myList,'\tAfter:', changeMyListModified(myList)) 21

logic used:

create an empty resultant list , iterate over myList and check each element . If element is greater or equal to zero then add to result in problem i , if element is greater than zero then append same number to resultant list else append zero to resultant list (this is in problem 2.)

note: in the programme changeMyListModified and changeMyList function is used to performe specific modification