human
Solve the following python programming problem given the following code:
def _edit_task_config(env, task_config, confirm) : 
    ' Launches text editor to edit provided task configuration file.

        `env`
            Runtime ``Environment`` instance.
        `task_config`
            Path to task configuration file.

        `confirm`
            If task config is invalid after edit, prompt to re-edit.

        Return boolean.

        * Raises ``InvalidTaskConfig`` if edited task config fails to parse
          and `confirm` is ``False``.
        ' 
    if common.IS_MACOSX : 
        def_editor = 'open' 
else : 
        def_editor = 'vi' 
editor = os.environ.get ('EDITOR', def_editor) 
    def _edit_file(filename) : 
        ' Launches editor for given filename.
            ' 
        proc = subprocess.Popen ('{0} {1}'.format (editor, filename), shell = True) 
        proc.communicate () 
        if (proc.returncode == 0) : 
            try : 
                parser_ = parser.parse_config (filename, 'task') 
                registration.run_option_hooks (parser_, disable_missing = False) 
except (parser.ParseError, errors.InvalidTaskConfig) as exc : 
                reason = unicode (getattr (exc, 'reason', exc)) 
                raise errors.InvalidTaskConfig (task_config, reason = reason) 
return True 
else : 
            return False 
try : 
        (fd, tmpname) = tempfile.mkstemp (suffix = '.cfg', prefix = 'focus_') 
        with open (task_config, 'r') as file_ : 
            os.write (fd, file_.read ()) 
            os.close (fd) 
while True : 
            try : 
                if (not _edit_file (tmpname)) : 
                    return False 
with open (tmpname, 'r') as temp : 
                    with open (task_config, 'w', 0) as config : 
                        config.write (temp.read ()) 
return True 
except errors.InvalidTaskConfig as exc : 
                if (not confirm) : 
                    raise 
env.io.error (unicode (fd)) 
                while True : 
                    try : 
                        resp = env.io.prompt ('Would you like to retry?...

    
    

    Fix the buggy line: env.io.error (unicode (fd))
assistant
#Here is Python code to fix the buggy line: env.

env.io.error (unicode (exc))