文档存储类型错误 | Python

Question

Update, I now get a TypeError on the last line 21.

So, if I make capacity = 2 , and add 1 document:

document_store = DocumentStore(2)
document_store.add_document("document")
print(document_store)

It should return:

Document store: 1/2

---

class DocumentStore(object):
   
def __init__(self, capacity):
    self._capacity = capacity
    self._documents = []

@property
def capacity(self):
    return self._capacity

@property
def documents(self):
    return self._documents

def add_document(self, document):
    if(len(self._documents) >= self._capacity):  # >=
        raise Exception('Document store is full') 
    self._documents.append(document)

def __repr__(self):
    return "Document store: " + len(self._documents) + "/" + self._capacity  # ERROR!

Answer 1

Update, I now get a TypeError on the last line 21.

So, if I make capacity = 2 , and add 1 document:

document_store = DocumentStore(2)
document_store.add_document("document")
print(document_store)

It should return:

Document store: 1/2

---

class DocumentStore(object):
   
def __init__(self, capacity):
    self._capacity = capacity
    self._documents = []

@property
def capacity(self):
    return self._capacity

@property
def documents(self):
    return self._documents

def add_document(self, document):
    if(len(self._documents) >= self._capacity):  # >=
        raise Exception('Document store is full') 
    self._documents.append(document)

def __repr__(self):
    return "Document store: " + len(self._documents) + "/" + self._capacity  # ERROR!