【求助】python编程：从入门到实践 项目3Web应用程序 出现TypeError at /topics/1/ 问题，江湖救急啊

[csdn20180208]

如图：


urls.py

"""定义learning_logs的URL模式"""

from django.urls import path,re_path

from . import views

urlpatterns = [
    #主页
    path('', views.index, name='index'),
    
    #显示所有主题
    path('topics/', views.topics, name='topics'),
    
    #显示所有主题
    re_path('topics/(?P<topic_id>\d+)/', views.topics, name='topic'),
    
    #特定主题的详细页面
    re_path('topics/(?P<topic_id>\d+)/', views.topic, name='topic'),
    
    #用于添加新主题的网页
    re_path('new_topic/', views.new_topic, name='new_topic'),
    
    #用于添加新条目的页面
    re_path('new_entry/(?P<topic_id>\d+)/', views.new_entry, name='new_entry'),
]
app_name = 'learning_logs'

views.py

from django.shortcuts import render
from django.http import HttpResponseRedirect
from django.urls import reverse

from .models import Topic
from .forms import TopicForm, EntryForm

# Create your views here.
def index(request):
    """学习笔记的主页"""
    return render(request, 'learning_logs/index.html')
    
def topics(request):
    """显示所有的主题"""
    topics = Topic.objects.order_by('date_added')
    context = {'topics':topics}
    return render(request, 'learning_logs/topics.html', context)
    
def topic(request,topic_id):
    """显示单个主题及其所有的条目"""
    topic = Topic.objects.get(id = topic_id)
    entries = topic.entry_set.order_by('-date_added')
    context = {'topic': topic, 'entries': entries}
    return render(request, 'learning_logs/topic.html', context)
    
def new_topic(request):
    """添加新主题"""
    if request.method != 'POST':
        #未提交数据：创建新表单
        form = TopicForm()
    else:
        #POST提交的数据，对数据进行处理
        form = TopicForm(request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('learning_logs:topics'))
            
    context = {'form':form}
    return render(request, 'learning_logs/new_topic.html', context)
    
def new_entry(request, topic_id):
    """在特定的主题中添加新条目"""
    topic = Topic.objects.get(id=topic_id)
    
    if request.method != 'POST':
        #未提交数据，创建一个空表单
        form = EntryForm()
    else:
        #POST提交的数据，对数据进行处理
        form = EntryForm(data=request.POST)
        if form.is_valid():
            new_entry = form.save(commit=False)
            new_entry.topic = topic
            new_entry.save()
            return HttpResponseRedirect(reverse('learning_logs:topic', args=[topic_id]))
            
    context = {'topic': topic, 'form': form}
    return render(request, 'learning_logs/new_entry.html', context)
    
topics.html

{% extends "learning_logs/base.html" %}

{% block content %}

  <p>Topics</p>
  
  <ul>
    {% for topic in topics %}
      <li>
        <a href="{% url 'learning_logs:topic' topic.id %}">{{ topic }}</a>
      </li>
    {% empty %}
      <li>No topics have been added yet.</li>
    {% endfor %}
  </ul>
  
  <a href="{% url 'learning_logs:new_topic' %}">Add a new topic:</a>
  
{% endblock content %}

topic.html

{% extends "learning_logs/base.html" %}

{% block content %}

  <p>Topic:{{ topic }}</p>
  
  <p>Entries:</p>
  <p>
    <a href="{% url 'learning_logs:new_entry' topic.id %}">add new entry</a>
  </p>
  <ul>
  {% for entry in entries %}
    <li>
      <p>{{ entry.date_added|date:'M d, Y H:i' }}</p>
      <p>{{ entry.text|linebreaks }}</p>
    </li>
  {% empty %}
    <li>
      There are no entries for this topic yet.
    </li>
  {% endfor %}
  </ul>


{% endblock content %}

其他页面还可以进，就是特定主题的界面进不去
求助各位大佬啊，不想自己的python生涯被一个小BUG断掉，哭嘤嘤
python版本是3.6，Django是2.0

[notback]

如果我没看错 #显示所有主题 re_path('topics/(?P<topic_id>\d+)/', views.topics, name='topic'), #特定主题的详细页面 re_path('topics/(?P<topic_id>\d+)/', views.topic, name='topic'), 你两个url的正则一模一样，可能是这里出问题了吧。 我猜测，特定主题的详细页面正则该是topic/(?P......吧？

[OneByOne-yy]

#显示所有主题
re_path('topics/(?P<topic_id>\d+)/', views.topics, name='topic'),这句注释掉试试。

[Awom.]

你找到原因了吗？我和你相同的问题