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class CategoryManager(object):
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class CategoryManager(object):
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    _instance = None
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    _instance = None
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    categories = dict()
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    categories = dict()
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    def __init__(self,):
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    def __init__(self,):
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        print self.categories
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        print "Returning category list"
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    def __new__(cls, *args, **kwargs):
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    def __new__(cls, *args, **kwargs):
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        if not cls._instance:
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        if not cls._instance:
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            cls._instance = super(CategoryManager, cls).__new__(cls, *args, **kwargs)
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            cls._instance = super(CategoryManager, cls).__new__(cls, *args, **kwargs)
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            client = InventoryClient().get_client()
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            client = InventoryClient().get_client()