DRY x0ret's code a little bit.

uncompyle6/semantics/helper.py

@@ -196,6 +196,26 @@ def flatten_list(node):
         pass
     return flat_elems
 
+# Note: this is only used in Python > 3.0
+# Should move this somewhere more specific?
+def gen_function_parens_adjust(mapping_key, node):
+    """If we can avoid the outer parenthesis
+    of a generator function, set the node key to
+    'generator_no_parens' and the caller will do the default
+    action on that. Otherwise we do nothing.
+    """
+    if mapping_key.kind != 'CALL_FUNCTION_1':
+        return
+
+    args_node = node[-2]
+    if args_node == 'pos_arg':
+        assert args_node[0] == 'expr'
+        n = args_node[0][0]
+        if n == 'generator_exp':
+            node.kind = 'generator_no_parens'
+        pass
+    return
+
 
 # if __name__ == '__main__':
 #     if PYTHON3: