Finding the max value of list in dictionary

Question

I have a dict and behind each key is a list stored. Looks like this:

dict with values:  {
u\'New_York\': [(u\'New_York\', u\'NY\', datetime.datetime(2014, 8, 13,         


        

Answer 1

Can you have a look at : https://wiki.python.org/moin/HowTo/Sorting#Sorting_Mini-HOW_TO

The answer may be :

In [2]: import datetime
In [3]: d = {
u'New_York': [(u'New_York', u'NY', datetime.datetime(2014, 8, 13, 0, 0), 10),         (u'New_York', u'NY', datetime.datetime(2014, 8, 13, 0, 0), 4), (u'New_York', u'NY', datetime.datetime(2014, 8, 13, 0, 0), 3)], 
u'Jersy': [(u'Jersy', u'JY', datetime.datetime(2014, 8, 13, 0, 0), 6), (u'Jersy', u'JY', datetime.datetime(2014, 8, 13, 0, 0), 7)], 
u'Alameda': [(u'Alameda', u'CA', datetime.datetime(2014, 8, 13, 0, 0), 1), (u'Alameda', u'CA', datetime.datetime(2014, 8, 13, 0, 0), 2), (u'Alameda', u'CA', datetime.datetime(2014, 8, 13, 0, 0), 3), (u'Alameda', u'CA', datetime.datetime(2014, 8, 13, 0, 0), 1)]
}
In [4]: def give_max_values(d):
...:     res = {}
...:     for key, vals in d.iteritems():
...:         res[key] = max(vals, key=lambda x: x[3])
...:     return res
In [5]: somedic = give_max_values(d)
In [6]: print somedic
{u'New_York': (u'New_York', u'NY', datetime.datetime(2014, 8, 13, 0, 0), 10), u'Jersy': (u'Jersy', u'JY', datetime.datetime(2014, 8, 13, 0, 0), 7), u'Alameda': (u'Alameda', u'CA', datetime.datetime(2014, 8, 13, 0, 0), 3)}