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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 subjects_create(self, filename, api_url=None, properties=None):
 """Create new anatomy subject at given SCO-API by uploading local file. Expects an tar-archive containing a FreeSurfer anatomy. Parameters filename : string Path to tar-archive on local disk api_url : string, optional Base Url of SCO-API where subject will be created properties : Dictionary, optional Set of additional properties for created subject Returns ------- scoserv.SubjectHandle Handle for local copy of created image group resource """

        # Create image group and return handle for created resource
        return self.subjects_get(
            SubjectHandle.create(
                self.get_api_references(api_url)[sco.REF_SUBJECTS_CREATE],
                filename,
                properties
            )
        )