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I propose to remove the following two lines with 'reload' from turtledemo.__main__.py.
from importlib import reload
...
... def loadfile(self, filename):
...
 reload(self.module)
Reloading modules each time a demo is run allows and even encourages module level code that initializes variables (other than classes) and has system side-effects. In particular, some such calls created the test problems reported in #21882. Code that needs to be run each time the required main() is called should be inside main. Indeed, reforming the two_canvases demo (see patch for #21882) made two_canvases work properly within the demo driver.
With the demos patched, I tried them all twice after commenting out the reload. I did not notice any difference, except possibly faster response.
I already edited the help text to tell users to initialize in main().

New changeset b76d854f580e by Terry Jan Reedy in branch '2.7':
Issue #22051: remove unneeded reload that allowed bad code.
http://hg.python.org/cpython/rev/b76d854f580e
New changeset 55d4f6c2be2d by Terry Jan Reedy in branch '3.4':
Issue #22051: remove unneeded reload that allowed bad code.
http://hg.python.org/cpython/rev/55d4f6c2be2d