human
Solve the following python programming problem given the following code:
def _write_pid_file(self, filename) : 
    fs.write_file (str (os.getpid ()), remove_pid_file) 
    def remove_pid_file() : 
        try : 
            os.remove (filename) 
except OSError : 
            pass 
UnhandledExceptionHandler.singleton ().add_teardown_callback (remove_pid_file) 

    
    

    Fix the buggy line: fs.write_file (str (os.getpid ()), remove_pid_file)
assistant
#Here is Python program to fix the buggy line: fs.

fs.write_file (str (os.getpid ()), filename)