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When dealing with implicit relative imports of the form "import <dotted_as_names> as...", the 2to3 import fixer will rewrite them as "from . import <dotted_as_names> as...".
This is invalid syntax. Here's an example:
$ tree package/
package/
├── __init__.py
├── rootmod.py
└── subpackage
 ├── __init__.py
 └── mod.py
1 directory, 4 files
$ cat package/rootmod.py # this is the only nonempty file
import subpackage.mod as my_name
$ python package/rootmod.py
$ 2to3 -w -f import package/
RefactoringTool: Refactored package/rootmod.py
--- package/rootmod.py	(original)
+++ package/rootmod.py	(refactored)
@@ -1 +1 @@
-import subpackage.mod as my_name
+from . import subpackage.mod as my_name
RefactoringTool: Files that were modified:
RefactoringTool: package/rootmod.py
$ python package/rootmod.py
 File "package/rootmod.py", line 1
 from . import subpackage.mod as my_name
 ^
SyntaxError: invalid syntax
Probably the easiest way to rewrite this is "from .subpackage import mod as my_name".