I've upgrade spyder today,and then it failed to startup.Appreciating your 
help.
And the error are following:

~$ spyder
Traceback (most recent call last):
  File "/usr/bin/spyder", line 3, in <module>
    start_app.main()
  File "/usr/lib/python2.7/dist-packages/spyderlib/start_app.py", line 114, 
in main
    from spyderlib import spyder
  File "/usr/lib/python2.7/dist-packages/spyderlib/spyder.py", line 155, in 
<module>
    from spyderlib.utils.environ import WinUserEnvDialog
  File "/usr/lib/python2.7/dist-packages/spyderlib/utils/environ.py", line 
17, in <module>
    from spyderlib.widgets.dicteditor import DictEditor
  File "/usr/lib/python2.7/dist-packages/spyderlib/widgets/dicteditor.py", 
line 39, in <module>
    from spyderlib.widgets.dicteditorutils import (sort_against, get_size,
  File 
"/usr/lib/python2.7/dist-packages/spyderlib/widgets/dicteditorutils.py", 
line 78, in <module>
    import bs4
  File "/usr/lib/python2.7/dist-packages/bs4/__init__.py", line 30, in 
<module>
    from .builder import builder_registry, ParserRejectedMarkup
  File "/usr/lib/python2.7/dist-packages/bs4/builder/__init__.py", line 
314, in <module>
    from . import _html5lib
  File "/usr/lib/python2.7/dist-packages/bs4/builder/_html5lib.py", line 
70, in <module>
    class TreeBuilderForHtml5lib(html5lib.treebuilders._base.TreeBuilder):
AttributeError: 'module' object has no attribute '_base'

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