Tkinter variables test fails when wantobjects is false:

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ERROR: test_default (__main__.TestVariable)
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Traceback (most recent call last):
  File "Lib/tkinter/test/test_tkinter/test_variables.py", line 29, in test_default
    self.assertEqual("", v.get())
  File "/home/serhiy/py/cpython/Lib/tkinter/__init__.py", line 239, in get
    return self._tk.globalgetvar(self._name)
_tkinter.TclError: can't read "PY_VAR0": no such variable

======================================================================
ERROR: test_default (__main__.TestStringVar)
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Traceback (most recent call last):
  File "Lib/tkinter/test/test_tkinter/test_variables.py", line 79, in test_default
    self.assertEqual("", v.get())
  File "/home/serhiy/py/cpython/Lib/tkinter/__init__.py", line 291, in get
    value = self._tk.globalgetvar(self._name)
_tkinter.TclError: can't read "PY_VAR2": no such variable

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ERROR: test_default (__main__.TestIntVar)
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Traceback (most recent call last):
  File "Lib/tkinter/test/test_tkinter/test_variables.py", line 92, in test_default
    self.assertEqual(0, v.get())
  File "/home/serhiy/py/cpython/Lib/tkinter/__init__.py", line 313, in get
    return getint(self._tk.globalgetvar(self._name))
_tkinter.TclError: can't read "PY_VAR3": no such variable

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ERROR: test_default (__main__.TestDoubleVar)
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Traceback (most recent call last):
  File "Lib/tkinter/test/test_tkinter/test_variables.py", line 114, in test_default
    self.assertEqual(0.0, v.get())
  File "/home/serhiy/py/cpython/Lib/tkinter/__init__.py", line 332, in get
    return getdouble(self._tk.globalgetvar(self._name))
_tkinter.TclError: can't read "PY_VAR4": no such variable

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ERROR: test_default (__main__.TestBooleanVar)
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Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/tkinter/__init__.py", line 352, in get
    return self._tk.getboolean(self._tk.globalgetvar(self._name))
_tkinter.TclError: can't read "PY_VAR5": no such variable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "Lib/tkinter/test/test_tkinter/test_variables.py", line 141, in test_default
    self.assertEqual(False, v.get())
  File "/home/serhiy/py/cpython/Lib/tkinter/__init__.py", line 354, in get
    raise ValueError("invalid literal for getboolean()")
ValueError: invalid literal for getboolean()

======================================================================
FAIL: test___del__ (__main__.TestVariable)
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Traceback (most recent call last):
  File "Lib/tkinter/test/test_tkinter/test_variables.py", line 38, in test___del__
    self.assertFalse(self.root.call("info", "exists", "varname"))
AssertionError: '0' is not false

======================================================================
FAIL: test_dont_unset_not_existing (__main__.TestVariable)
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Traceback (most recent call last):
  File "Lib/tkinter/test/test_tkinter/test_variables.py", line 45, in test_dont_unset_not_existing
    self.assertFalse(self.root.call("info", "exists", "varname"))
AssertionError: '0' is not false

----------------------------------------------------------------------

Here is a patch which fixes tkinter and tests.

New changeset b13c15a9ae54 by Serhiy Storchaka in branch '2.7':
Issue #20067: Tkinter variables now work when wantobjects is false.
http://hg.python.org/cpython/rev/b13c15a9ae54

New changeset fbc1a39b68e4 by Serhiy Storchaka in branch '3.3':
Issue #20067: Tkinter variables now work when wantobjects is false.
http://hg.python.org/cpython/rev/fbc1a39b68e4

New changeset 99df5128d978 by Serhiy Storchaka in branch 'default':
Issue #20067: Tkinter variables now work when wantobjects is false.
http://hg.python.org/cpython/rev/99df5128d978