mylist code

[imran akhtar]

i have to Write a program which outputs the alternating sum of all elements of a list taken in as a parameter. For example if myList contains 4, 7, 9, 23, 45, 12, the function should output the results of 4 + 7, 9 – 23, 45 + 12,


i dont understand how i would start this, if any one can give me help, how to start this that will be great.

[Curtis Rutland]

Please check my reply in your other thread.

MODERATOR

[imran akhtar]

my code list

ok understand, wht you have siad, below i have givin it a go, can you direct me from here.

def listtotal ():
    total=0
    mylist=[4,7,9,23,45,12]
    for x in range (len(mylist)):

temp=input("plese enter a number")
        if temp in mylist:
            print "number in list"
        else:
            print "numbers not in list"
            
        total=total+temp
        return total

[bvdet]

i have to Write a program which outputs the alternating sum of all elements of a list taken in as a parameter. For example if myList contains 4, 7, 9, 23, 45, 12, the function should output the results of 4 + 7, 9 – 23, 45 + 12,


i dont understand how i would start this, if any one can give me help, how to start this that will be great.

According to the desired output, the result should be a list (the result of 3 calculations). You can iterate on mylist with the range function using a step of 2. Example:

mylist = [4,7,12,45,19,6]
factor = 1
results = []
for i in range(0, len(mylist), 2):
    results.append(mylist[i] + mylist[i+1]*factor)
    factor *= -1