dict to object (old version for history)

morphs.py

"""Module's functions allow convert Python dictionary to object.
"""

def dict2obj(pydict):
    """Converts dictionaries into objects that allow names
    to be accessed as attributes as well as items.
    """
    
    class container(object):

        def __setitem__(self, key, value):
            if not key.startswith('_'):
                self.__dict__[key] = value
            else:
                msg = 'Key cannot start from underscores: "%s"' % key
                raise AttributeError(msg)

        def __getitem__(self, item):
            if not item.startswith('_') and item in self.__dict__:
                return self.__dict__[item]
            else:
                raise AttributeError('No such attribute: "%s"' % item)

    def copy(obj):
        if isinstance(obj, dict):
            c = container()
            for k, v in obj.iteritems():
                c[k] = copy(v)
            return c
        elif isinstance(obj, (list, tuple)):
            return [copy(i) for i in obj]
        else:
            return obj

    return copy(pydict)

def yaml2obj(yamlfilename):
    """Converts information from file in YAML format to object
    """
    
    import yaml

    yt = yaml.loadfile(yamlfilename)
    
    if not isinstance(yt, dict):
        raise ValueError, '%s top level is not a dictionary' % yamlfilename
    
    return dict2obj(yt)

##def dto2glob(pydict):
##    """
##    Converts dictionary to object
##    and then loads it to module's namespace
##    """
##    globals().update(dict2obj(pydict))