plugins django-apps in sidebar with eval()

[kase]

i want made a plugin sistem  for one CMS  my idea is:

#plugin
def plugin ():

    do somting

    return render_to_string('plugin.html',{})

and  one database whit plugins  method name  "Plugin_sidebar"

#view

def home(request):

    ps = Plugin_sidebar.objects.all()

    return render_to_response('home.html',{'ps':ps})

and  template whit custom tag  eval()

{%for  item in  ps %}

{%eval  item%}   #custom tag

{%endfor%}

with this sistem the user can add and remove plugins... what do you think?