005_015 Python 人名按字母排序，首字母分组

代码如下：

#encoding=utf-8

print '中国'

#人名按字母排序，首字母分组
import itertools

import itertools

def groupnames(name_iterable):
    sorted_names = sorted(name_iterable, key=_sortkeyfunc)
    name_dict = {  }
    for key, group in itertools.groupby(sorted_names, _groupkeyfunc):        
        name_dict[key] = tuple(group)
    return name_dict

pieces_order = { 2: (-1, 0), 3: (-1, 0, 1) }

def _sortkeyfunc(name):    
    name_parts = name.split( )
    return ' '.join([name_parts[n] for n in pieces_order[len(name_parts)]])

def _groupkeyfunc(name): 
    return name.split( )[-1][0]


list=['L jhon Ljhon','b ack back','b lack black']
print groupnames(list)


#group by 分组
from itertools import groupby
from operator import itemgetter

things = [('2009-09-02', 11),
          ('2009-09-02', 3),
          ('2009-09-03', 10),
          ('2009-09-03', 4),
          ('2009-09-03', 22),
          ('2009-09-06', 33)]

for key, items in groupby(things, itemgetter(0)):
    print key
    for subitem in items:
        print subitem
    print '-' * 20

打印结果如下：

中国
{'b': ('b ack back', 'b lack black'), 'L': ('L jhon Ljhon',)}
2009-09-02
('2009-09-02', 11)
('2009-09-02', 3)
--------------------
2009-09-03
('2009-09-03', 10)
('2009-09-03', 4)
('2009-09-03', 22)
--------------------
2009-09-06
('2009-09-06', 33)
--------------------