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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 dispatch_job_hook(self, link, key, job_config, logfile, stream=sys.stdout):
 """Send a single job to be executed Parameters link : `fermipy.jobs.chain.Link` The link used to invoke the command we are running key : str A string that identifies this particular instance of the job job_config : dict A dictionrary with the arguments for the job. Used with the self._command_template job template logfile : str The logfile for this job, may be used to check for success/ failure """

        full_sub_dict = job_config.copy()

        full_command = "%s >& %s" % (
            link.command_template().format(**full_sub_dict), logfile)

        logdir = os.path.dirname(logfile)

        if self._dry_run:
            sys.stdout.write("%s\n" % full_command)
        else:
            try:
                os.makedirs(logdir)
            except OSError:
                pass
            os.system(full_command)