Patch by Tshepang Lekhonkhobe, reviewed by Georg Brandl.

Thanks to Amaury Forgeot d’Arc and Philip J. Eby.

Original patch by Lina Clark.

Patch by Lita Cho.

it clear that any Python 3.x is not usable with the checked out Sphinx.

Patch by Gareth Rees.

as documented.  The pattern and source keyword parameters are left as
deprecated aliases.

from __future__ import unicode_literals.  Initial patch by Juancarlo Añez.

The demos at the end of turtle.py appear to be the only test, so I changed
some of the strings to unicode with a u prefix.  If os.path.isfile or the Tk
image function have problems with Unicode input, that would be different issue.

Thanks Vajrasky Kok and Zachary Ware.

Code patch by Serhiy Storchaka

fileinput.hook_encoded.

Patch by Sean Rodman.

Original patches by A. Kuchling and G. Rees (#12691).

variables names and values.

exception raised by sys.exit is None when no code is given.

As suggested by Serhiy Storchaka.

Tkinter widgets to work in wantobjects=True mode.

and to modernize.  Initial patch by Gareth Rees.

Patch based on lines from Georg Brandl, Eric Snow, and Gareth Rees.

Replace it with correct logic that raises ValueError for bad input.
Issues #8478 and #12691 reported the incorrect logic.
Add an Untokenize test case and an initial test method.