<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def build_global(self, global_node):
 """parse `global` section, and return the config.Global Args: global_node (TreeNode):
 `global` section treenode Returns: config.Global: an object """

        config_block_lines = self.__build_config_block(
            global_node.config_block)
        return config.Global(config_block=config_block_lines)