privatise check_future_import

Author: graingert

libmodernize/__init__.py

@@ -8,7 +8,7 @@
 __version__ = "0.8.1.dev0"
 
 
-def check_future_import(node):
+def _check_future_import(node):
     """If this is a future import, return set of symbols that are imported,
     else return None."""
     # node should be the import statement here
@@ -64,7 +64,7 @@ def add_future(node, symbol):
         ):
             # skip over docstring
             continue
-        names = check_future_import(node)
+        names = _check_future_import(node)
         if not names:
             # not a future statement; need to insert before this
             break