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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 __configure_client(self, config):
 """ write the perforce client """

        self.logger.info("Configuring p4 client...")
        client_dict = config.to_dict()
        client_dict['root_path'] = os.path.expanduser(config.get('root_path'))
        os.chdir(client_dict['root_path'])
        client_dict['hostname'] = system.NODE
        client_dict['p4view'] = config['p4view'] % self.environment.target.get_context_dict()
        client = re.sub('//depot', '    //depot', p4client_template % client_dict)
        self.logger.info(lib.call("%s client -i" % self.p4_command,
                                  stdin=client,
                                  env=self.p4environ,
                                  cwd=client_dict['root_path']))