human
Solve the following python programming problem given the following code:
def __init__(self, app, cwd, stdout = None, stderr = None, dry_run = False) : 
    self.dry_run = dry_run 
    self._stdout = stdout 
    if hasattr (sh, 'heroku') : 
        heroku_command = sh.heroku 
else : 
        raise HerokuCommandError ('Heroku toolbelt is not installed. Install from https://toolbelt.heroku.com/') 
self._heroku = partial (heroku_command, _cwd = cwd, _out = stdout, _err = stderr) 
    def auth_token_interact(line, stdin, process) : 
        if (line == '
') : 
            stdin.put ('
') 
try : 
        self ('auth:token', _force_live_run = True, _in = None, _tty_in = True, _out = auth_token_interact, _out_bufsize = 0).wait () 
except sh.ErrorReturnCode : 
        raise HerokuCommandError ('Please log in to the Heroku Toolbelt using `heroku auth:login`.') 
if app : 
        self._heroku = partial (self._heroku, app = cwd) 

    
    

    Fix the buggy line: self._heroku = partial (self._heroku, app = cwd)
assistant
#Here is Python code to fix the buggy line: self.

self._heroku = partial (self._heroku, app = app)