统计名字列表中，各名字的首字母在名字列表中出现的次数

name_list=['foster',"janet",'jessus','david']count_dict={}for i in name_list:    count_dict[i]="".join(name_list).count(i[0])print count_dict

>>> def countfist(a):...     res = {}...     for i in a:...         res[i] = "".join(a).count(i[0])...     return res...>>> countfist(new_mystr){'and': 3, 'world': 1, 'itcastcpp': 2, 'itcast': 2, 'hello': 1}>>>

>>> name_list=['foster',"janet",'jessus','david']>>> countfist(name_list){'david': 2, 'foster': 1, 'janet': 2, 'jessus': 2}>>>