How to add the values together in a key

Question

if I have a dictionary

example = {'cat' : 1, 'dog' : 2, 'cow' : 3, 'horse' : 4}

How would I add the values together?

I've tried

count = 0
for x in example:
    example[x] += count
    print example

But that just prints example three times. How do I do it so I get 10 as an answer?

the `example` declaration is invalid – Magnun Leno Jun 17 '14 at 16:09 — Magnun Leno, Jun 17 '14 at 16:09
ok my bad I meant dictionary haha that was just a slip up – nmares12 Jun 17 '14 at 16:09 — nmares12, Jun 17 '14 at 16:09

score 2 · Answer 1 · answered Jun 17 '14 at 16:09

2

>>> example = {'cat' : 1, 'dog' : 2, 'cow' : 3, 'horse' : 4}
>>> sum(example.itervalues())
10
>>>

answered Jun 17 '14 at 16:09

`dict.values` is also present in Python 2 – Magnun Leno Jun 17 '14 at 16:18
Yes, but it creates an unnecessary list. `dict.itervalues` however returns an iterator like `dict.values` in Python 3.x. – Jun 17 '14 at 16:20

score 1 · Answer 2 · answered Jun 17 '14 at 16:11

1

What you want is this:

example = {'cat' : 1, 'dog' : 2, 'cow' : 3, 'horse' : 4}
for x in example:
    count += example[x]
print count

Or:

example = {'cat' : 1, 'dog' : 2, 'cow' : 3, 'horse' : 4}
sum(example.values())

answered Jun 17 '14 at 16:11

Magnun Leno

score 0 · Answer 3 · answered Jun 17 '14 at 16:12

0

You were close:

example = {'cat' : 1, 'dog' : 2, 'cow' : 3, 'horse' : 4}
count = 0
for x in example:
    count += example[x]
print count

Magnun Leno and iCodez's answers are more elegant (and pythonic) though.

answered Jun 17 '14 at 16:12

Mardoxx

3 Answers3