python 字典排序

dic={'a':1,'bc':4,'c':2}

for i in dic:
print i,i[0] #key

print dic.iteritems()
print type(dic.iteritems())

for i in dic.iteritems():
print i,i[0],i[1]

print sorted(dic.iteritems(), key=lambda d:d[1], reverse = True) #lambda函数，d是参数，d[1]是返回值