[issue3417] make the fix_dict fixer smarter

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

for k in d.keys():
   return k   # needs to return a list

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3417>
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