human
Solve the following python programming problem given the following code:
def prep_localized_datetime(sender, **kwargs) : 
    for field in sender._meta.fields : 
        if ((not isinstance (field, LocalizedDateTimeField)) or (field.timezone is None)) : 
            continue 
dt_field_name = ('_datetimezone_%s' % field.attname) 
        def get_dtz_field(instance) : 
            return getattr (instance, dt_field_name) 
def set_dtz_field(instance, dt) : 
            if (dt.tzinfo is None) : 
                dt = default_tz.localize (dt) 
time_zone = field.timezone 
            if isinstance (field.timezone, basestring) : 
                tz_name = instance._default_manager.filter (pk = model_instance._get_pk_val ()).values_list (field.timezone) [0] [0] 
                try : 
                    time_zone = pytz.timezone (tz_name) 
except : 
                    time_zone = default_tz 
if (time_zone is None) : 
                    time_zone = default_tz 
else : 
                if callable (time_zone) : 
                    tz_name = time_zone () 
                    if isinstance (tz_name, basestring) : 
                        try : 
                            time_zone = pytz.timezone (tz_name) 
except : 
                            time_zone = default_tz 
else : 
                        time_zone = tz_name 
if (time_zone is None) : 
                        time_zone = default_tz 
setattr (instance, dt_field_name, dt.astimezone (time_zone)) 
setattr (get_dtz_field, field.attname, property (get_dtz_field, set_dtz_field)) 

    
    

    Fix the buggy line: setattr (get_dtz_field, field.attname, property (get_dtz_field, set_dtz_field))
assistant
#Here is Python program to fix the buggy line: setattr (get_dtz_field, field.

setattr (sender, field.attname, property (get_dtz_field, set_dtz_field))