python classes adding numbers

Question

I need to write a class, Numbers, with methods addNumbers and currentSum, that prints the current sum. Eg.:

numbers = Numbers()
numbers.addNumber(3)
numbers.addNumber(2)
print numbers.currentSum()

should print 5

I have made a class:

class Numbers:
    def __init__(self, numbers):
    self.numbers=addNumbers
    return numbers.currentSum()
Numbers=Numbers()

A hint, anyone?

If you're using Python 2.x, use `class X(object):` instead. `class X:` is an old style class.. [Here are the differences](http://docs.python.org/reference/datamodel.html#new-style-and-classic-classes). — John Doe, Dec 08 '11 at 16:56

score 3 · Answer 1 · answered Dec 08 '11 at 16:46

3

class Numbers:
    def __init__(self):
       self.__sum=0
    def addNumber(self, number):
       self.__sum += number
    def currentSum(self):
       return self.__sum

answered Dec 08 '11 at 16:46

ILYA Khlopotov

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That's... not a hint. That's doing the entire thing for the OP. – Matt Ball Dec 08 '11 at 16:47

score 2 · Answer 2 · edited May 23 '17 at 12:27

2

Hints:

You need to implement the currentSum() method
You also need to implement the addNumber() method
addNumber() will need to keep track of numbers across method calls. Use a list.

More reading on methods: What is a "method" in Python?

edited May 23 '17 at 12:27

Community

1
1

answered Dec 08 '11 at 16:44

Matt Ball

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score 0 · Answer 3 · answered Dec 08 '11 at 16:47

0

class Numbers(object):
    def __init__(self):
        self.sum = 0

    def addNumber(self, n):
        self.sum += n

    def currentSum(self):
        return self.sum

answered Dec 08 '11 at 16:47

aemdy

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python classes adding numbers

3 Answers3