练习:根据车牌信息,统计各省车牌持有量

cars = ["鲁A32444","鲁B12333","京B8989M","黑C49555","沪B25041"]
locals = {"沪":"上海","黑":"黑龙江","鲁":"山东","京":"北京"}

结果:{"山东":2,"北京":1,"黑龙江":1,"上海":1}

cars = ["鲁A32444","鲁B12333","京B8989M","黑C49555","沪B25041"]
locals = {"沪":"上海","黑":"黑龙江","鲁":"山东","京":"北京"}

dic = {}
names = []
for i in cars:
    value = locals[i[0]] #黑龙江
    names.append(value) #['山东', '山东', '北京', '黑龙江', '上海']
set1 = set(names)  #{'山东', '北京', '黑龙江', '上海'}
for j in set1:
    dic.update({j:names.count(j)})  ##  注意 统计列表中不同元素出现的个数  元素作为key  出现的次数是value
print(dic)