I'm trying to make a small modification to django lfs project, that will allow me to deactivate products with no stocks. Unfortunatelly I'm just beginning to learn python, so I have big trouble with its syntax. That's what I'm trying to do. I'm using method 'has_variants' which returns true if product has any. Then I'm building a list from variants for this product. Next for every product in this list (I've called it 'set') I check it's stock and set bool variable 'inactive' to true if product has no stocks and to false if there are any. Finally if 'inactive' is false I'm setting self.active to 0. Code fails in line with:

set[] = s

How to correct it ?

    def deactivate(self):
    """If there are no stocks, deactivate the product. Used in last step of checkout.
    """
    if self.has_variants():
        for s in self.variants.filter(active=True):
            set[] = s   
        for var in set:
            if var.get_stock_amount() == 0:
                inactive = True
            else:
                inactive = False
    else:
        if self.get_stock_amount() == 0:
            inactive = True

    if inactive:
        self.active = False           
    return 0

error log :

Traceback (most recent call last):
  File "manage.py", line 11, in <module>
    execute_manager(settings)
  File "/home/purplecow/rails/purpledev/site-packages/django/core/management/__i                            nit__.py", line 362, in execute_manager
    utility.execute()
  File "/home/purplecow/rails/purpledev/site-packages/django/core/management/__i                            nit__.py", line 303, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/purplecow/rails/purpledev/site-packages/django/core/management/bas                            e.py", line 195, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/home/purplecow/rails/purpledev/site-packages/django/core/management/bas                            e.py", line 213, in execute
    translation.activate('en-us')
  File "/home/purplecow/rails/purpledev/site-packages/django/utils/translation/_                            _init__.py", line 73, in activate
    return real_activate(language)
  File "/home/purplecow/rails/purpledev/site-packages/django/utils/translation/_                            _init__.py", line 43, in delayed_loader
    return g['real_%s' % caller](*args, **kwargs)
  File "/home/purplecow/rails/purpledev/site-packages/django/utils/translation/t                            rans_real.py", line 205, in activate
    _active[currentThread()] = translation(language)
  File "/home/purplecow/rails/purpledev/site-packages/django/utils/translation/t                            rans_real.py", line 194, in translation
    default_translation = _fetch(settings.LANGUAGE_CODE)
  File "/home/purplecow/rails/purpledev/site-packages/django/utils/translation/t                            rans_real.py", line 180, in _fetch
    app = import_module(appname)
  File "/home/purplecow/rails/purpledev/site-packages/django/utils/importlib.py"                            , line 35, in import_module
    __import__(name)
  File "/home/purplecow/rails/purpledev/lfs/caching/__init__.py", line 1, in <mo                            dule>
    from listeners import *
  File "/home/purplecow/rails/purpledev/lfs/caching/listeners.py", line 10, in <                            module>
    from lfs.cart.models import Cart
  File "/home/purplecow/rails/purpledev/lfs/cart/models.py", line 8, in <module>
    from lfs.catalog.models import Product
  File "/home/purplecow/rails/purpledev/lfs/catalog/__init__.py", line 1, in <mo                            dule>
    from listeners import *
  File "/home/purplecow/rails/purpledev/lfs/catalog/listeners.py", line 5, in <m                            odule>
    from lfs.catalog.models import PropertyGroup
  File "/home/purplecow/rails/purpledev/lfs/catalog/models.py", line 589
    set[] = s
        ^
SyntaxError: invalid syntax