初学python 想到的方法👀 能解不知道还有没有更好的 str = "bccdaAB" data ={} for i in str: if i.isupper(): data[i] = data.get(i,0) + 1 elif i.islower(): data[i] = data.get(i,0) + 1 keys = sorted([ord(key) for key in data.keys()]) for key in keys: if key+32 in keys: keys.remove(key+32) keys.insert(keys.index(key)+1,key+32) result = {} for i in keys: result[chr(i)] = data[chr(i)] print(result)