title: Unable to open background image file in Turtle
body: <p>i am working on a space invaders game, and i have a problem, my background is not working. Here is he code that was necessary, but didn't work:  </p>
  
  <pre><code>wn = turtle.Screen() 
  wn.bgcolor("black")
  wn.title("Space Invaders")
  wn.bgpic('space_invaders_background.gif')
  </code></pre>
  
  <p>and the error message said</p>
  
  <p>'[Running] python -u "d:\USERS\chedl\Documents\Apps\games_and_apps\offline\python\space_invaders\main.py"
  Traceback (most recent call last):
    File "d:\USERS\chedl\Documents\Apps\games_and_apps\offline\python\space_invaders\main.py", line 10, in 
      wn.bgpic('space_invaders_background.gif')
    File "C:\Users\chedl\AppData\Local\Programs\Python\Python36\lib\turtle.py", line 1481, in bgpic
      self._bgpics[picname] = self._image(picname)
    File "C:\Users\chedl\AppData\Local\Programs\Python\Python36\lib\turtle.py", line 479, in _image
      return TK.PhotoImage(file=filename)
    File "C:\Users\chedl\AppData\Local\Programs\Python\Python36\lib\tkinter__init__.py", line 3539, in <strong>init</strong>
      Image.<strong>init</strong>(self, 'photo', name, cnf, master, **kw)
    File "C:\Users\chedl\AppData\Local\Programs\Python\Python36\lib\tkinter__init__.py", line 3495, in <strong>init</strong>
      self.tk.call(('image', 'create', imgtype, name,) + options)
  _tkinter.TclError: couldn't open "space_invaders_background.gif": no such file or directory</p>
  
  <p>[Done] exited with code=1 in 0.273 seconds'</p>
  
  <p>but the space_invaders_background.gif is in the same file as the actual python application.</p>