Standard input is empty

Standard output is empty

Traceback (most recent call last):
  File "./prog.py", line 2, in <module>
  File "<string>", line 6, in forward
  File "/usr/lib/python3.4/turtle.py", line 3812, in __init__
    Turtle._screen = Screen()
  File "/usr/lib/python3.4/turtle.py", line 3662, in Screen
    Turtle._screen = _Screen()
  File "/usr/lib/python3.4/turtle.py", line 3678, in __init__
    _Screen._root = self._root = _Root()
  File "/usr/lib/python3.4/turtle.py", line 434, in __init__
    TK.Tk.__init__(self)
  File "/usr/lib/python3.4/tkinter/__init__.py", line 1859, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: Can't find a usable init.tcl in the following directories: 
    /usr/share/tcltk/tcl8.6 /usr/lib/tcl8.6 /lib/tcl8.6 /usr/library /library /tcl8.6.4/library /tcl8.6.4/library



This probably means that Tcl wasn't installed properly.