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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 creator(_, config):
 """Creator function for creating an instance of a Packer image script."""

        packer_script = render(config.script, model=config.model, env=config.env,
                               variables=config.variables, item=config.item)
        filename = "packer.dry.run.see.comment"

        if not config.dry_run:
            # writing Packer file (JSON)
            filename = write_temporary_file(packer_script, 'packer-', '.json')
            packer_script = ''

        # rendering the Bash script for generating the Packer image
        template_file = os.path.join(os.path.dirname(__file__), 'templates/packer-image.sh.j2')

        with open(template_file) as handle:
            template = handle.read()
            config.script = render(template, debug=config.debug,
                                   packer_content=packer_script,
                                   packer_filename=filename)

        return Packer(config)