正在创建哈希表：TypeError:在字符串格式化期间未转换所有参数

Question

我正试图用以下代码创建哈希表，但当我创建它的实例时，会得到一个：

TypeError: not all arguments converted during string formatting

我不太确定哪里出错了；类型错误似乎是在我使用函数hashfunction时出现的，但我似乎看不到类型错误在哪里。你知道吗

class HashTable:

def __init__(self):
    self.size = 11
    self.slots = [None] * self.size
    self.data = [None] * self.size

def hashfunction(self, key, size):
    # key is already the hashed ID
    return key % size

def rehash(self, old_hash_value, size):
    return (old_hash_value + 1) % size

def put(self, key, data): 
    hashvalue = self.hashfunction(data, len(self.slots))
    if self.slots[hashvalue] == None:
        self.slots[hashvalue] = hashvalue
        self.data[hashvalue] = data
    else:
        if self.slots[hashvalue] == key:
            self.data[hashvalue] == data
        else:
            nextslot = self.rehash(hashvalue, len(self.slots))
            while self.slots[nextslot] != None and self.slots[nextslots] != key: 
                nextslot = self.rehash(nextslot, len(self.slots))
            if self.slots[nextslot] == None:
                self.slots[nextslot] = key
                self.data[nextslot] = data
            else:
                self.data[nextslot] = data

def get(self, key): 
    start = self.hash(key, len(self.size))
    if self.slots[start] == key:
        return self.data[start] == key
    else: # slots[start] != key
        new_start = self.rehash(key, len(self.size))
        # recursive: if slots[new_start] == key, then return result

def __getitem__(self,key):
    return self.get(key)

def __setitem__(self, key, data):
    return self.put(key, data)


# Instance of HashTable

H = HashTable()
H[54] = "cat"
print(H.data)