写一份在线教育平台的源代码

抱歉，由于在线教育平台是一个复杂的系统，我们无法在一个简单的回答里提供完整的源代码。不过，我们可以为你提供一些常见的在线教育平台功能的代码示例以供参考：

1. 用户登录/注册

登录功能：

def login(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)
        if user is not None:
            login(request, user)
            return redirect('home')
        else:
            messages.error(request, 'Invalid login credentials')
    return render(request, 'login.html')

注册功能：

def register(request):
    if request.method == 'POST':
        form = UserCreationForm(request.POST)
        if form.is_valid():
            form.save()
            username = form.cleaned_data.get('username')
            messages.success(request, f'Account created for {username}!')
            return redirect('login')
    else:
        form = UserCreationForm()
    return render(request, 'register.html', {'form': form})

2. 课程浏览/搜索

课程列表页面：

{% for course in courses %}
    <div class="course">
        <h2>{{ course.title }}</h2>
        <p>{{ course.description }}</p>
        <a href="{% url 'enroll' course.id %}">Enroll</a>
    </div>
{% endfor %}

搜索功能：

def search_course(request):
    query = request.GET.get('q')
    if query:
        courses = Course.objects.filter(Q(title__icontains=query) | Q(description__icontains=query))
    else:
        courses = Course.objects.all()

    context = {'courses': courses, 'query': query}
    return render(request, 'search.html', context)

3. 视频课程上传与播放

上传视频课程：

@login_required
def upload_video(request, course_id):
    course = Course.objects.get(id=course_id)
    if request.method == 'POST':
        form = VideoForm(request.POST, request.FILES)
        if form.is_valid():
            video = form.save(commit=False)
            video.course = course
            video.save()
            messages.success(request, 'Your video has been uploaded successfully!')
            return redirect('course_detail', course_id)
    else:
        form = VideoForm()
    return render(request, 'upload_video.html', {'form': form, 'course': course})

播放视频课程：

<video controls>
    <source src="{{ video.video.url }}" type="{{ video.video.file.content_type }}">
</video>

4. 讨论/社区

创建讨论主题：

@login_required
def create_topic(request, course_id):
    course = Course.objects.get(id=course_id)
    if request.method == 'POST':
        form = TopicForm(request.POST)
        if form.is_valid():
            topic = form.save(commit=False)
            topic.course = course
            topic.author = request.user
            topic.save()
            messages.success(request, 'Your topic has been created successfully!')
            return redirect('course_detail', course_id)
    else:
        form = TopicForm()
    return render(request, 'create_topic.html', {'form': form, 'course': course})

展示讨论主题：

{% for topic in course.topics.all %}
    <div class="topic">
        <h3>{{ topic.title }}</h3>
        <p>{{ topic.content }}</p>
        <p>Posted by {{ topic.author.username }} at {{ topic.date_posted }}</p>
        <a href="{% url 'topic_detail' course_id topic.id %}">View Replies</a>
    </div>
{% endfor %}

这里提供的只是一个简单的示例，实际的在线教育平台代码会更加复杂和全面。希望这些代码示例可以对你有所帮助，如果你想了解更多，请参考 Django 官方文档和其他在线教育平台的源代码。