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bzrlib/registry.py
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        """
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        return self._dict[self._get_key_or_default(key)].get_obj()
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    def get_prefix(self, fullname):
 
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        """Return an object whose key is a prefix of the supplied value.
 
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        :fullname: The name to find a prefix for
 
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        :return: a tuple of (object, remainder), where the remainder is the
 
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            portion of the name that did not match the key.
 
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        """
 
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        for key, value in self.iteritems():
 
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            if fullname.startswith(key):
 
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                return value, fullname[len(key):]
 
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    def _get_key_or_default(self, key=None):
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        """Return either 'key' or the default key if key is None"""
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        if key is not None: