def activate(request, activation_key,
             template_name='registration/activate.html',
             extra_context=None):
    """
    Activate a ``User``'s account from an activation key, if their key
    is valid and hasn't expired.
    
    By default, use the template ``registration/activate.html``; to
    change this, pass the name of a template as the keyword argument
    ``template_name``.
    
    **Required arguments**
    
    ``activation_key``
       The activation key to validate and use for activating the
       ``User``.
    
    **Optional arguments**
       
    ``extra_context``
        A dictionary of variables to add to the template context. Any
        callable object in this dictionary will be called to produce
        the end result which appears in the context.
    
    ``template_name``
        A custom template to use.
    
    **Context:**
    
    ``account``
        The ``User`` object corresponding to the account, if the
        activation was successful. ``False`` if the activation was not
        successful.
    
    ``expiration_days``
        The number of days for which activation keys stay valid after
        registration.
    
    Any extra variables supplied in the ``extra_context`` argument
    (see above).
    
    **Template:**
    
    registration/activate.html or ``template_name`` keyword argument.
    
    """
    activation_key = activation_key.lower() # Normalize before trying anything with it.
    account = RegistrationProfile.objects.activate_user(activation_key)
    if extra_context is None:
        extra_context = {}
    context = RequestContext(request)
    for key, value in extra_context.items():
        context[key] = callable(value) and value() or value
    return render_to_response(template_name,
                              { 'account': account,
                                'expiration_days': settings.ACCOUNT_ACTIVATION_DAYS },
                              context_instance=context)
dataset/ETHPy150Open davemerwin/blue-channel/external_apps/registration/views.py/activate/original