Attemt to fix ast transformer now that Num and Str atr the same Constant ast node

Also fix soem new sytax warnings.

IPython/core/tests/test_interactiveshell.py

@@ -616,7 +616,8 b' class Negator(ast.NodeTransformer):'
 
     if sys.version_info > (3,8):
         def visit_Constant(self, node):
-            return self.visit_Num(node)
+            if isinstance(node.value, int):
+                return self.visit_Num(node)
 
 class TestAstTransform(unittest.TestCase):
     def setUp(self):
@@ -687,7 +688,8 b' class IntegerWrapper(ast.NodeTransformer):'
 
     if sys.version_info > (3,8):
         def visit_Constant(self, node):
-            return self.visit_Num(node)
+            if isinstance(node.value, int):
+                return self.visit_Num(node)
 
 
 class TestAstTransform2(unittest.TestCase):
@@ -735,7 +737,8 b' class ErrorTransformer(ast.NodeTransformer):'
 
     if sys.version_info > (3,8):
         def visit_Constant(self, node):
-            return self.visit_Num(node)
+            if isinstance(node.value, int):
+                return self.visit_Num(node)
 
 
 class TestAstTransformError(unittest.TestCase):
@@ -760,6 +763,11 b' class StringRejector(ast.NodeTransformer):'
     def visit_Str(self, node):
         raise InputRejected("test")
 
+    # 3.8 only
+    def visit_Constant(self, node):
+        if isinstance(node.value, str):
+            raise InputRejected("test")
+
 
 class TestAstTransformInputRejection(unittest.TestCase):
 

IPython/terminal/ptutils.py

@@ -53,7 +53,7 b' def _elide(string, *, min_elide=30):'
 
 
 def _adjust_completion_text_based_on_context(text, body, offset):
-    if text.endswith('=') and len(body) > offset and body[offset] is '=':
+    if text.endswith('=') and len(body) > offset and body[offset] == '=':
         return text[:-1]
     else:
         return text