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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _merge_configs(configs):
 """ Merge one or more ``KubeConfig`` objects. :param list[KubeConfig] configs: The configurations to merge. :return KubeConfig: A single configuration object with the merged configuration. """

    result = {
        u"contexts": [],
        u"users": [],
        u"clusters": [],
        u"current-context": None,
    }
    for config in configs:
        for k in {u"contexts", u"users", u"clusters"}:
            try:
                values = config.doc[k]
            except KeyError:
                pass
            else:
                result[k].extend(values)

        if result[u"current-context"] is None:
            try:
                result[u"current-context"] = config.doc[u"current-context"]
            except KeyError:
                pass

    return KubeConfig(result)