human
Solve the following python programming problem given the following code:
def gunicorn_run() : 
    '
    The ``gunicorn_pecan`` command for launching ``pecan`` applications
    ' 
    try : 
        from gunicorn.app.wsgiapp import WSGIApplication 
except ImportError as exc : 
        args = exc.args 
        arg0 = (exc [0] if args else '') 
        arg0 += ' (are you sure `gunicorn` is installed?)' 
        exc.args = ((arg0,) + args [1 :]) 
        raise 
class PecanApplication (WSGIApplication) : 
        def init(self, parser, opts, args) : 
            if (len (args) != 1) : 
                parser.error ('No configuration file was specified.') 
self.cfgfname = os.path.normpath (os.path.join (os.getcwd (), args [0])) 
            self.cfgfname = os.path.abspath (self.cfgfname) 
            if (not os.path.exists (self.cfgfname)) : 
                parser.error (('Config file not found: %s' % self.cfgfname)) 
from pecan.configuration import _runtime_conf, set_config 
            set_config (self.cfgfname, overwrite = True) 
            cfg = { 
                
} 
            if _runtime_conf.get ('server') : 
                server = _runtime_conf ['server'] 
                if (hasattr (server, 'host') and hasattr (server, 'port')) : 
                    cfg ['bind'] = ('%s:%s' % (server.host, server.port)) 
return cfg 
def load(self) : 
            from pecan.deploy import deploy 
            return deploy (self.cfgfname) 
PecanApplication ('%(prog)s [OPTIONS] config.py').run () 

    
    

    Fix the buggy line: arg0 = (exc [0] if args else '')
assistant
#Here is Python code to fix the buggy line: arg0 = (exc [0] if args else '')
.

arg0 = (args [0] if args else '')