python 练习题

[['A','1'],['B','2'], ['C','3'], ['A','4'], ['B','5'], ['C','6'], ['A','1'], ['B','1'], ['C','1']]分别将这里面的A所对应的数都相加，B所对应的数相加，C所对应的数相加
这里面的A,B,C是随机的 有可能下回就是G，H，I了

list=[['A','1'],['B','2'], ['C','3'], ['A','4'], ['B','5'], ['C','6'], ['A','1'], ['B','1']]
dic={'A':'0','B':'0','C':'0'}
print type(dic.get('A'))
print type(int(dic.get('A')))
#print elem[0],':',(int(dic.get(elem[0]))+int(elem[1]))
for elem in list:
    dic[elem[0]]=str(int(dic.get(elem[0]))+int(elem[1]))

print dic