使用Pyramid Web框架实现Web应用的登录功能

该示例代码演示了如何使用Pyramid Web框架实现Web应用的用户登录功能，其中包括注册、登录和登出三个步骤。实现方式采用了Pyramid自带的Session和Authentication插件来实现用户信息的存储和验证，并通过数据库存储用户信息和密码加密来保障安全性。

config.include('pyramid_jinja2')
config.include('pyramid_authstack')
config.include('pyramid_beaker')

# 注册
@view_config(route_name='signup', renderer='signup.jinja2')
def signup(request):
    if request.method == 'POST':
        username = request.POST.get('username')
        password = request.POST.get('password')
        if check_username(username):
            save_user(username, password)
            session = request.session
            session['username'] = username
            headers = remember(request, username)
            return HTTPFound(location='/', headers=headers)
    return {}

# 登录
@view_config(route_name='login', renderer='login.jinja2')
@forbidden_view_config(renderer='login.jinja2', xhr=False)
def login(request):
    if request.method == 'POST':
        username = request.POST.get('username')
        password = request.POST.get('password')
        if check_password(username, password):
            session = request.session
            session['username'] = username
            headers = remember(request, username)
            return HTTPFound(location='/', headers=headers)
    return {}

# 登出
@view_config(route_name='logout')
def logout(request):
    session = request.session
    session.invalidate()
    headers = forget(request)
    return HTTPFound(location='/', headers=headers)

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