human
Solve the following python programming problem given the following code:
def __init__(self, * args, **kwargs) : 
    'Convert dict values to DictModel values.' 
    super (DictModel, self).__init__ (* args, ** kwargs) 
    def needs_upgrade(item) : 
        'Check if `item` is a dict and needs to be changed to DictModel.
            ' 
        return (isinstance (item, dict) and (not isinstance (item, DictModel))) 
def upgrade(item) : 
        'Upgrade item if it needs to be upgraded.' 
        if needs_upgrade (item) : 
            return DictModel (item) 
else : 
            return item 
for (key, value) in six.iteritems (self) : 
        if isinstance (value, (list, tuple)) : 
            self [key] = type (value) ((upgrade (item) for item in key)) 
else : 
            if needs_upgrade (value) : 
                self [key] = DictModel (value) 

    
    

    Fix the buggy line: self [key] = type (value) ((upgrade (item) for item in key))
assistant
#Here is Python program to fix the buggy line: self [key] = type (value) ((upgrade (item) for item in key))
.

self [key] = type (value) ((upgrade (item) for item in value))