def create_policy_version(policyName=None, policyDocument=None,
    setAsDefault=None):
    """
    Creates a new version of the specified AWS IoT policy. To update a policy, create a new policy version. A managed policy can have up to five versions. If the policy has five versions, you must use  DeletePolicyVersion to delete an existing version before you create a new one.
    Optionally, you can set the new version as the policy's default version. The default version is the operative version (that is, the version that is in effect for the certificates to which the policy is attached).
    See also: AWS API Documentation
    
    
    :example: response = client.create_policy_version(
        policyName='string',
        policyDocument='string',
        setAsDefault=True|False
    )
    
    
    :type policyName: string
    :param policyName: [REQUIRED]
            The policy name.
            

    :type policyDocument: string
    :param policyDocument: [REQUIRED]
            The JSON document that describes the policy. Minimum length of 1. Maximum length of 2048, excluding whitespaces
            

    :type setAsDefault: boolean
    :param setAsDefault: Specifies whether the policy version is set as the default. When this parameter is true, the new policy version becomes the operative version (that is, the version that is in effect for the certificates to which the policy is attached).

    :rtype: dict
    :return: {
        'policyArn': 'string',
        'policyDocument': 'string',
        'policyVersionId': 'string',
        'isDefaultVersion': True|False
    }
    
    
    """
    pass
