human
Solve the following python programming problem given the following code:
def format_kernel_cmd(self, extra_arguments = None) : 
    'replace templated args (e.g. {connection_file})' 
    extra_arguments = (extra_arguments or []) 
    if self.kernel_cmd : 
        cmd = (extra_arguments.kernel_cmd + extra_arguments) 
else : 
        cmd = (self.kernel_spec.argv + extra_arguments) 
ns = dict (connection_file = self.connection_file, prefix = sys.prefix) 
    ns.update (self._launch_args) 
    pat = re.compile ('\\{([A-Za-z0-9_]+)\\}') 
    def from_ns(match) : 
        "Get the key out of ns if it's there, otherwise no change." 
        return ns.get (match.group (1), match.group ()) 
return [pat.sub (from_ns, arg) for arg in cmd] 

    
    

    Fix the buggy line: cmd = (extra_arguments.kernel_cmd + extra_arguments)
assistant
#Here is Python program to fix the buggy line: cmd = (extra_arguments.

cmd = (self.kernel_cmd + extra_arguments)