[python] How to find the key (index) of the minimum non-zero value from a dict (list)?

Scripting
1

Hi,

I cannot seem to find this without the use of numpy.
I don’t want to use numpy.

Could anyone please help me?

Thanks in advance.

2

what do you mean by dict(list) ? Are you looking for solutions for both dict and list?

UPDATE : now includes negative values, finds the lowest

For a List, then for a dict

mylist = [0,3,2,-1,0,5]
target = min([i for i in mylist if i != 0])
print mylist.index(target)

mydict = {k:v for k, v in zip('PEYCHV', mylist)}
target = min([i for i in mydict.itervalues() if i != 0])
for k,v in mydict.iteritems():
    if v == target:
        print k
        break
1 Like
3

yes, as an alternative, whatever is easier, quicker.

I came up with this one for dictionary :slight_smile: :

import operator

scrambled_dict = {'a':2,'b':0,'c':1,'d':3}

sorted_scrambled_dict = sorted(scrambled_dict.items(), key=operator.itemgetter(1))
#sorted_scrambled_dict = sorted(scrambled_dict.items(), key=lambda kv: kv[1])

for item in sorted_scrambled_dict:
    if item[1] != 0:
        print item[0]
        break
4

OK - done, above

1 Like
5

Thanks @Dancergraham

6

Very welcome :smiley:

7

:man_facepalming:

I spent so much time last night and this morning that I forgot what I needed that for. I’ll have to look around at my scripts.

I think it was when I was working on solution for this thread:

2 Likes
8

So did you do it?

9

Or maybe for conciseness:

    a = dict(nine=9, one=1, two=2, three=3, four=4, zilch=0, filth=5, sing=6, devil=0)
    print a
    b = KeyOfMinNonZero(a)
    print b

    
def KeyOfMinNonZero(dict):
    d = [(v, k) for (k, v) in dict.items() if v != 0]
    return min(d)[1]

Regards
Jeremy

2 Likes
10

I just understood the algorithm to get the min non-zero index. :smiley:
And I’m at work.
Perhaps tonight I’ll try to solve it.

11

Nice one @jeremy5

I’m not very good at creating these “one-liners” yet.

If I want to add IF or lambda and IF. and it fails whatever I do, I get mad and do the normal iteration :frowning: