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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 _get_vcap_services(vcap_services=None):
 """Retrieves the VCAP Services information from the `ConfigParams.VCAP_SERVICES` field in the config object. If `vcap_services` is not specified, it takes the information from VCAP_SERVICES environment variable. Args: vcap_services (str):
 Try to parse as a JSON string, otherwise, try open it as a file. vcap_services (dict):
 Return the dict as is. Returns: dict: A dict representation of the VCAP Services information. Raises: ValueError: * if `vcap_services` nor VCAP_SERVICES environment variable are specified. * cannot parse `vcap_services` as a JSON string nor as a filename. """

    vcap_services = vcap_services or os.environ.get('VCAP_SERVICES')
    if not vcap_services:
        raise ValueError(
            "VCAP_SERVICES information must be supplied as a parameter or as environment variable 'VCAP_SERVICES'")
    # If it was passed to config as a dict, simply return it
    if isinstance(vcap_services, dict):
        return vcap_services
    try:
        # Otherwise, if it's a string, try to load it as json
        vcap_services = json.loads(vcap_services)
    except json.JSONDecodeError:
        # If that doesn't work, attempt to open it as a file path to the json config.
        try:
            with open(vcap_services) as vcap_json_data:
                vcap_services = json.load(vcap_json_data)
        except:
            raise ValueError("VCAP_SERVICES information is not JSON or a file containing JSON:", vcap_services)
    return vcap_services