Multiple import form for __future__ imports confuses futurize

[QuLogic]

Running futurize -1 -a -w file.py on a file that contains from __future__ import (division, print_statement) (from some previous work, for example), fails with:

Traceback (most recent call last):
  File "/usr/bin/futurize", line 9, in <module>
    load_entry_point('future==0.14.1', 'console_scripts', 'futurize')()
  File "/usr/lib/python2.7/site-packages/libfuturize/main.py", line 295, in main
    options.processes)
  File "/usr/lib64/python2.7/lib2to3/refactor.py", line 706, in refactor
    items, write, doctests_only)
  File "/usr/lib64/python2.7/lib2to3/refactor.py", line 301, in refactor
    self.refactor_file(dir_or_file, write, doctests_only)
  File "/usr/lib64/python2.7/lib2to3/refactor.py", line 747, in refactor_file
    *args, **kwargs)
  File "/usr/lib64/python2.7/lib2to3/refactor.py", line 354, in refactor_file
    tree = self.refactor_string(input, filename)
  File "/usr/lib64/python2.7/lib2to3/refactor.py", line 386, in refactor_string
    self.refactor_tree(tree, name)
  File "/usr/lib64/python2.7/lib2to3/refactor.py", line 460, in refactor_tree
    new = fixer.transform(node, results)
  File "/usr/lib/python2.7/site-packages/libfuturize/fixes/fix_add__future__imports_except_unicode_literals.py", line 24, in transform
    future_import(u"print_function", node)
  File "/usr/lib/python2.7/site-packages/libfuturize/fixer_util.py", line 210, in future_import
    names = check_future_import(node)
  File "/usr/lib/python2.7/site-packages/libfuturize/fixer_util.py", line 424, in check_future_import
    assert False, "strange import: %s" % savenode
AssertionError: strange import: 
from __future__ import (division, print_function)

Note: Multiple imports on one line are usually against PEP8, but it seems that pep8 doesn't mind it with __future__ imports... Sorry, import x, y, z is against PEP8, but from a import x, y z is fine.

[Bernhard10]

In

from future.builtins.disabled import (apply, cmp, coerce, execfile,
                             file, long, raw_input, reduce, reload,
                             unicode, xrange, StandardError)

the StandardError also gets changed to

from future.builtins.disabled import (apply, cmp, coerce, execfile,
                             file, long, raw_input, reduce, reload,
                             unicode, xrange, Exception)