Doctest fails with: inconsistent leading whitespace

[maet3608]

Under Mac OS some doctests fail with <file.rst> has inconsistent leading whitespace: '\r'
See below:

E ValueError: line 20 of the docstring for rearranging.rst has inconsistent leading whitespace: '\r'
____________________________________________________ ERROR collecting sphinx/source/tutorial/transforming.rst ____________________________________________________
../../anaconda/envs/keras_theano/lib/python2.7/doctest.py:671: in get_doctest
return DocTest(self.get_examples(string, name), globs,
../../anaconda/envs/keras_theano/lib/python2.7/doctest.py:685: in get_examples
return [x for x in self.parse(string, name)
../../anaconda/envs/keras_theano/lib/python2.7/doctest.py:647: in parse
self._parse_example(m, name, lineno)
../../anaconda/envs/keras_theano/lib/python2.7/doctest.py:717: in _parse_example
lineno + len(source_lines))
../../anaconda/envs/keras_theano/lib/python2.7/doctest.py:803: in _check_prefix
(lineno+i+1, name, line))
E ValueError: line 37 of the docstring for transforming.rst has inconsistent leading whitespace: '\r'

[maet3608]

doctests must not be indented, which resolves this issue. For instance,

print 'test'
'test'

will work while

print 'test'
'test'

in some case (which ones?) leads to "inconsistent leading whitespace" errors