[issue14117] Turtledemo: exception and minor glitches.

[Terry J. Reedy]

New submission from Terry J. Reedy <tjreedy at udel.edu>:

Win7, 3.2.2, python -m turtledemo in Command Prompt Window

After running clock example, hitting Stop results in following:
Clock face, including hands, is erased. Day and date are left (intentional?), and the following appears back in command prompt window.

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Programs\Python32\lib\tkinter\__init__.py", line 1399, in __call__
    return self.func(*args)
  File "C:\Programs\Python32\lib\tkinter\__init__.py", line 487, in callit
    func(*args)
  File "C:\Programs\Python32\lib\turtledemo\clock.py", line 116, in tick
    second_hand.setheading(6*sekunde)
  File "C:\Programs\Python32\lib\turtle.py", line 1936, in setheading
    self._rotate(angle)
  File "C:\Programs\Python32\lib\turtle.py", line 3279, in _rotate
    self._update()
  File "C:\Programs\Python32\lib\turtle.py", line 2660, in _update
    self._update_data()
  File "C:\Programs\Python32\lib\turtle.py", line 2646, in _update_data
    self.screen._incrementudc()
  File "C:\Programs\Python32\lib\turtle.py", line 1285, in _incrementudc
    raise Terminator
turtle.Terminator

Demo continues to run.

Paint: Left clicking mouse moves dot without painting. Right clicking changes mode so left clicking draws line. It also causes some filling of enclosed regions. This double action is slightly obscure. The prompt on the bottom of the screen says "Use mouse/keys or Stop" As near as I can tell, keys are inactive. So prompt could delete '/keys'.

Module doc strings that explain each demo should be wrapped so that they appear in the code window without scrolling. Or the left window could be wider, especially if the user widens the window. 800x600 screens are pretty rare these days. 

'Wikipedia' is a poor name for something just because it happened to be there. 'Rosette', for instance, would be better.

----------
components: Library (Lib)
messages: 154164
nosy: terry.reedy
priority: normal
severity: normal
status: open
title: Turtledemo: exception and minor glitches.
type: behavior
versions: Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14117>
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