Python ncurses addstr expected bytes or str, got int

Question

I am attempting to create an ASCII level editor in Python using curses but I'm having issues. I get Traceback (most recent call last): File "lvleditor_curses.py", line 36, in <module> editor.newLine() File "lvleditor_curses.py", line 31, in newLine self.stdscr.addstr(self.level[0][0]) TypeError: expect bytes or str, got int when using the following code.

import os, curses

class Editor:

  def __init__(self):
    self.stdscr = curses.initscr()
    curses.noecho()
    curses.cbreak()
    self.stdscr.keypad(True)

    self.stdscr.addstr("test")
    self.stdscr.refresh()


    self.level = []

  def newLine(self):
    line = self.stdscr.getstr()

    self.level += [list(line)]
    self.stdscr.addstr(self.level[0][0])
    self.stdscr.refresh()


editor = Editor()
editor.newLine()

Please, provide your code as a [Minimal, Complete, and Verifiable example](https://stackoverflow.com/help/mcve). If you encounter errors, copy and paste the error message into your question. — TwistedSim, Apr 24 '18 at 18:39
What is the type of `self.level[0][0]` at runtime? (with `type(self.level[0][0])`) — TwistedSim, Apr 24 '18 at 18:41

score 1 · Answer 1 · answered Oct 10 '20 at 12:35

1

I just had this issue now. The getstr function returns a bytearray by default. Therefore you must cast the bytearray to a string. Add:

line = line.decode()

Under:

line = self.stdscr.getstr()

answered Oct 10 '20 at 12:35

James

274
4
12

score 0 · Answer 2 · answered Apr 24 '18 at 18:48

0

Clearly, self.level[0][0] is of the wrong type (int). Cast it to string with str(self.level[0][0]).

answered Apr 24 '18 at 18:48

TwistedSim

1,960
9
23

When casting it prints out the ASCII value. – Jordan Baron Apr 24 '18 at 20:49

Python ncurses addstr expected bytes or str, got int

2 Answers2