clean can randomize attribute order

[trainiac]

import bleach

bleach.clean('<iframe height="315" src="//www.youtube.com/embed/qdJp5-g69go" width="560"></iframe>', tags=allowed_tags, attributes=allowed_attributes, styles=allowed_styles)

# outputs 
# <iframe src="//www.youtube.com/embed/qdJp5-g69go" width="560" height="315"></iframe>

# would be nice to have
# <iframe height="315" src="//www.youtube.com/embed/qdJp5-g69go" width="560"></iframe>

[trainiac]

Main reason this is an issue is because it makes unit testing a little trickier.

[jsocol]

See also #109.

#109 is difficult to fix, but replacing the attribute dict with an OrderedDict would probably not be, which may be a decent partial solution.

[msabramo]

Just ran into this as well while working on pypa/readme_renderer#3.

[marca@marca-mac2 readme]$ tox --hashseed=3142166842 -e py27 -- -k test_rst_008 --tb=short
GLOB sdist-make: /Users/marca/dev/git-repos/readme/setup.py
py27 inst-nodeps: /Users/marca/dev/git-repos/readme/.tox/dist/readme-0.3.0.zip
py27 runtests: PYTHONHASHSEED='3142166842'
py27 runtests: commands[0] | py.test -k test_rst_008 --tb=short
============================================================================= test session starts ==============================================================================
platform darwin -- Python 2.7.6 -- py-1.4.26 -- pytest-2.6.4
plugins: capturelog, cov
collected 8 items

tests/test_rst.py F

=================================================================================== FAILURES ===================================================================================
_________________________________________________________________________________ test_rst_008 _________________________________________________________________________________
tests/test_rst.py:39: in test_rst_008
    _do_test_with_files('test_rst_008')
tests/test_rst.py:49: in _do_test_with_files
    assert out == expected_html
E   assert '<p>Here is s...nkey</a></p>\n' == '<p>Here is so...nkey</a></p>\n'
E     Skipping 1352 identical leading characters in diff, use -v to show
E     -  click <a href="http://www.surveymonkey.com" rel="nofollow">SurveyMonkey</a></p>
E     ?                                             ---------------
E     +  click <a rel="nofollow" href="http://www.surveymonkey.com">SurveyMonkey</a></p>
E     ?          +++++++++++++++
==================================================================== 7 tests deselected by '-ktest_rst_008' ====================================================================
==================================================================== 1 failed, 7 deselected in 0.41 seconds ====================================================================
ERROR: InvocationError: '/Users/marca/dev/git-repos/readme/.tox/py27/bin/py.test -k test_rst_008 --tb=short'
___________________________________________________________________________________ summary ____________________________________________________________________________________
ERROR:   py27: commands failed

[marca@marca-mac2 readme]$ tox --hashseed=1651908909 -e py27 -- -k test_rst_008 --tb=short
GLOB sdist-make: /Users/marca/dev/git-repos/readme/setup.py
py27 inst-nodeps: /Users/marca/dev/git-repos/readme/.tox/dist/readme-0.3.0.zip
py27 runtests: PYTHONHASHSEED='1651908909'
py27 runtests: commands[0] | py.test -k test_rst_008 --tb=short
============================================================================= test session starts ==============================================================================
platform darwin -- Python 2.7.6 -- py-1.4.26 -- pytest-2.6.4
plugins: capturelog, cov
collected 8 items

tests/test_rst.py .

==================================================================== 7 tests deselected by '-ktest_rst_008' ====================================================================
==================================================================== 1 passed, 7 deselected in 0.37 seconds ====================================================================
___________________________________________________________________________________ summary ____________________________________________________________________________________
  py27: commands succeeded
  congratulations :)