diff --git a/test/bytecode_3.2_run/04_call_function.pyc b/test/bytecode_3.2_run/04_call_function.pyc
index aceb8c1d..662d6d43 100644
Binary files a/test/bytecode_3.2_run/04_call_function.pyc and b/test/bytecode_3.2_run/04_call_function.pyc differ
diff --git a/test/bytecode_3.5_run/04_call_function.pyc b/test/bytecode_3.5_run/04_call_function.pyc
index 5e2ef8e8..942b70a0 100644
Binary files a/test/bytecode_3.5_run/04_call_function.pyc and b/test/bytecode_3.5_run/04_call_function.pyc differ
diff --git a/test/bytecode_3.6_run/04_call_function.pyc b/test/bytecode_3.6_run/04_call_function.pyc
index ae64294d..a11bdced 100644
Binary files a/test/bytecode_3.6_run/04_call_function.pyc and b/test/bytecode_3.6_run/04_call_function.pyc differ
diff --git a/test/bytecode_3.7_run/04_call_function.pyc b/test/bytecode_3.7_run/04_call_function.pyc
new file mode 100644
index 00000000..cf21a240
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diff --git a/test/simple_source/bug35/04_call_function.py b/test/simple_source/bug35/04_call_function.py
index 9a41deef..7fad3438 100644
--- a/test/simple_source/bug35/04_call_function.py
+++ b/test/simple_source/bug35/04_call_function.py
@@ -79,3 +79,7 @@ class ResultMixin(object):
 
 class SplitResult(namedtuple('SplitResult', 'scheme netloc path query fragment'), ResultMixin):
     pass
+
+# From 3.3.7 test_long.py
+# Bug was that we need parens around first "0"
+assert (0).bit_length() == 0
diff --git a/uncompyle6/semantics/customize37.py b/uncompyle6/semantics/customize37.py
index 3ec60c0c..bf5ba35e 100644
--- a/uncompyle6/semantics/customize37.py
+++ b/uncompyle6/semantics/customize37.py
@@ -81,7 +81,7 @@ def customize_for_version37(self, version):
                 (17, "for_block"),
                 (25, "else_suite"),
             ),
-            "attribute37": ("%c.%[1]{pattr}", 0),
+            "attribute37": ("%c.%[1]{pattr}", (0, "expr")),
             "attributes37": ("%[0]{pattr} import %c",
                             (0, "IMPORT_NAME_ATTR"),
                             (1, "IMPORT_FROM")),
@@ -175,6 +175,20 @@ def customize_for_version37(self, version):
             pass
         return
 
+    def n_attribute37(node):
+        expr = node[0]
+        assert expr == "expr"
+        if expr[0] == "LOAD_CONST":
+            # FIXME: I didn't record which constants parenthesis is
+            # necessary. However, I suspect that we could further
+            # refine this by looking at operator precedence and
+            # eval'ing the constant value (pattr) and comparing with
+            # the type of the constant.
+            node.kind = "attribute_w_parens"
+        self.default(node)
+
+    self.n_attribute37 = n_attribute37
+
     def n_call(node):
         p = self.prec
         self.prec = 100