Python question

[Erik Max Francis]

Harry wrote:

>   It is nice to join the python group. Can someone please help me with
> a python question?
> I have the following object which is like a list of tuples
> What command do I use to get the value corresponding to 'min'?
> This object seems to be non-indexable
> 
> 
> row= [('name', 'x1'), ('min', 15.449041129349528), ('max',
> 991.6337818245629), ('range', 976.18474069521335), ('mean',
> 496.82174193958127), ('stddev', 304.78275004920454), ('variance',
> 92892.524727555894), ('mode', '46.5818482111'), ('unique_count', '99'),
> ('count', 99.0), ('count_missing', 0.0), ('sum_weight', 99.0)]

Iterating would be the best way.  There are shorter ways of writing it, 
for instance with list comprehensions, but it's still iteration::

	for key, value in row:
	    if key == 'min':
	        print value
	        break

or::

	results = [v for k, v in row if k == 'min']
	print results[0]

Another way, if you plan to access this same data structure in this way 
multiple times before moving on to the next one, would be to turn it 
into a dictionary first::

	d = dict(row)
	print d['min']

Note that all of these solutions assume that the key you want is indeed 
in there.  If it might not be, then you'll have to gracefully handle errors.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 20 N 121 53 W && AIM erikmaxfrancis
   Divide the fire, and you will the sooner put it out.
    -- Publilius Syrus