[issue4899] doctest should support fixtures

[David W. Lambert]

David W. Lambert <lambertdw at corning.com> added the comment:

For unittests I recommend two things instead of need for doctest change.
A decoupled strict test to prove that the iterator works, and this class
to publish,

class Tped_use_cases(...):

    def test_Marker_iteration(self):

        '''
            Illustrative code adapted from what is now your doctest
        '''

    ...

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<http://bugs.python.org/issue4899>
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