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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 _convert_2_0_0(topo, topo_path):
 """ Convert topologies from GNS3 2.0.0 to 2.1 Changes: * Remove startup_script_path from VPCS and base config file for IOU and Dynamips """

    topo["revision"] = 8

    for node in topo.get("topology", {}).get("nodes", []):
        if "properties" in node:
            if node["node_type"] == "vpcs":
                if "startup_script_path" in node["properties"]:
                    del node["properties"]["startup_script_path"]
                if "startup_script" in node["properties"]:
                    del node["properties"]["startup_script"]
            elif node["node_type"] == "dynamips" or node["node_type"] == "iou":
                if "startup_config" in node["properties"]:
                    del node["properties"]["startup_config"]
                if "private_config" in node["properties"]:
                    del node["properties"]["private_config"]
                if "startup_config_content" in node["properties"]:
                    del node["properties"]["startup_config_content"]
                if "private_config_content" in node["properties"]:
                    del node["properties"]["private_config_content"]
    return topo