human
Solve the following python programming problem given the following code:
def __unicode__(self) : 
    "Return a rendered Digg-style pagination (by default).

        The callable *settings.PAGE_LIST_CALLABLE* can be used to customize
        how the pages are displayed. The callable takes the current page number
        and the total number of pages, and must return a sequence of page
        numbers that will be displayed. The sequence can contain other values:

            - *'previous'*: will display the previous page in that position;
            - *'next'*: will display the next page in that position;
            - *'first'*: will display the first page as an arrow;
            - *'last'*: will display the last page as an arrow;
            - *None*: a separator will be displayed in that position.

        Here is an example of custom calable that displays the previous page,
        then the first page, then a separator, then the current page, and
        finally the last page::

            def get_page_numbers(current_page, num_pages):
                return ('previous', 1, None, current_page, 'last')

        If *settings.PAGE_LIST_CALLABLE* is None an internal callable is used,
        generating a Digg-style pagination. The value of
        *settings.PAGE_LIST_CALLABLE* can also be a dotted path to a callable.
        " 
    if (len (self) > 1) : 
        callable_or_path = settings.PAGE_LIST_CALLABLE 
        if callable_or_path : 
            if callable (callable_or_path) : 
                pages_callable = callable_or_path 
else : 
                pages_callable = loaders.load_object (callable_or_path) 
else : 
            pages_callable = utils.get_page_numbers 
pages = [] 
        for item in pages_callable (self._page.number, len (callable_or_path)) : 
            if (item is None) : 
                pages.append (None) 
else : 
                if (item == 'previous') : 
                    pages.append (self.previous ()) 
else : 
                    if (item == 'next') : 
                        pages.append (self.next ()) 
else : 
                        if...

    
    

    Fix the buggy line: for item in pages_callable (self._page.number, len (callable_or_path)) :
assistant
#Here is Python code to fix the buggy line: for item in pages_callable (self.

for item in pages_callable (self._page.number, len (self)) :