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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 copy_table( self, sources, destination, job_id=None, job_id_prefix=None, location=None, project=None, job_config=None, retry=DEFAULT_RETRY, ):
 """Copy one or more tables to another table. See https://cloud.google.com/bigquery/docs/reference/rest/v2/jobs#configuration.copy Arguments: sources (Union[ \ :class:`~google.cloud.bigquery.table.Table`, \ :class:`~google.cloud.bigquery.table.TableReference`, \ str, \ Sequence[ \ Union[ \ :class:`~google.cloud.bigquery.table.Table`, \ :class:`~google.cloud.bigquery.table.TableReference`, \ str, \ ] \ ], \ ]):
 Table or tables to be copied. destination (Union[ :class:`~google.cloud.bigquery.table.Table`, \ :class:`~google.cloud.bigquery.table.TableReference`, \ str, \ ]):
 Table into which data is to be copied. Keyword Arguments: job_id (str):
 (Optional) The ID of the job. job_id_prefix (str) (Optional) the user-provided prefix for a randomly generated job ID. This parameter will be ignored if a ``job_id`` is also given. location (str):
 Location where to run the job. Must match the location of any source table as well as the destination table. project (str):
 Project ID of the project of where to run the job. Defaults to the client's project. job_config (google.cloud.bigquery.job.CopyJobConfig):
 (Optional) Extra configuration options for the job. retry (google.api_core.retry.Retry):
 (Optional) How to retry the RPC. Returns: google.cloud.bigquery.job.CopyJob: A new copy job instance. """

        job_id = _make_job_id(job_id, job_id_prefix)

        if project is None:
            project = self.project

        if location is None:
            location = self.location

        job_ref = job._JobReference(job_id, project=project, location=location)

        # sources can be one of many different input types. (string, Table,
        # TableReference, or a sequence of any of those.) Convert them all to a
        # list of TableReferences.
        #
        # _table_arg_to_table_ref leaves lists unmodified.
        sources = _table_arg_to_table_ref(sources, default_project=self.project)

        if not isinstance(sources, collections_abc.Sequence):
            sources = [sources]

        sources = [
            _table_arg_to_table_ref(source, default_project=self.project)
            for source in sources
        ]

        destination = _table_arg_to_table_ref(destination, default_project=self.project)

        copy_job = job.CopyJob(
            job_ref, sources, destination, client=self, job_config=job_config
        )
        copy_job._begin(retry=retry)

        return copy_job