human
Solve the following python programming problem given the following code:
def _print_copy(self, typename) : 
    fields = ([field for field in self._fields if (not field [2])] + [field for field in typename._fields if field [2]]) 
    args = '
'.join (('            self.{},'.format (snake (name)) for (type, name, nullable, plural) in fields)) 
    print ('
    def __copy__(self):
        return type(self)(
{}
            self.loc
       )'.format (args)) 

    
    

    Fix the buggy line: fields = ([field for field in self._fields if (not field [2])] + [field for field in typename._fields if field [2]])
assistant
#Here is Python program to fix the buggy line: fields = ([field for field in self.

fields = ([field for field in self._fields if (not field [2])] + [field for field in self._fields if field [2]])