CODEWITHSUNDEEP
pythonpython-3.x
user2124939
user2124939

Reputation: 13

Having trouble using the sum function

The input (list) would be a list similar to [[1,2],[5,6],[4,6]]. I am trying to add the whole row together to test if it is even or odd.

def evenrow(list):
    for row in list:
        for item in row:
            newNums+=item
            n=sum(newNums)
            print(n)

Upvotes: 1

Views: 117

Answers (3)

AI Generated Response
AI Generated Response

Reputation: 8837

Just an alternate method:

def evenrow(lst):
    return sum(map(sum,lst))%2 == 0 #True if even, False otherwise.

This works this way:

The outer sum adds up all items of the map, which applies sum to each item in lst. In python2, map returns a list object, while in python3, it returns a map object. This is passed to the outer sum function, which adds up all items in your map.

def evenrow(lst):
    return sum(itertools.chain(*a)) % 2 == 0

This expands all the items in a (each of the sublists), and chains them together, as a chain object. It then adds together all the items and determines if the sum is even.

Upvotes: 1

aga
aga

Reputation: 29416

You don't need the following line of code: n=sum(newNums). You already summed up all the items of row in the newNums += item line. Second, you have to declare newNums before using it in your code. So, the fixed version of code will look like this:

def evenrow(list):
    for row in list:
        newNums = 0
        for item in row:
            newNums += item
        print(newNums)

BTW: You should consider accepting answers to some of your previous questions, otherwise nobody will spend their time to answer your new questions.

Upvotes: 0

Artsiom Rudzenka
Artsiom Rudzenka

Reputation: 29093

First of all do not use 'list' as variable name. Second you calling sum for int value not for a list and that's why you getting error. Check your code please.

Not sure but your code can looks like:

def evenrow(list):
    for row in list:
        value = sum(row)
        if values is even: # put your condition here
            # do something
        else:
            print "Value is odd"

Upvotes: 2

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