feat: enhance comparisons in subscript to support multiple comparators

Author: pwwang

tests/test_varname.py

@@ -273,6 +273,8 @@ def func():
     assert c.value == "c[b < 1 and b > 0]"
     c[b < 1 or b > 0] = func()
     assert c.value == "c[b < 1 or b > 0]"
+    c[0 < b < 2] = func()
+    assert c.value == "c[0 < b < 2]"
 
 
 def test_unusual():

varname/utils.py

@@ -274,14 +274,11 @@ def node_name(
             str(node_name(value)) for value in node.values
         )
     if isinstance(node, ast.Compare):
-        # When the node is identified by executing, len(ops) is always 1.
-        # Otherwise, the node cannot be identified.
-        assert len(node.ops) == 1
-        return (
-            f"{node_name(node.left)} "
-            f"{OP2SYMBOL[type(node.ops[0])]} "
-            f"{node_name(node.comparators[0])}"
-        )
+        parts = [str(node_name(node.left))]
+        for op, comparator in zip(node.ops, node.comparators):
+            parts.append(OP2SYMBOL[type(op)])
+            parts.append(str(node_name(comparator)))
+        return " ".join(parts)
     if isinstance(node, ast.UnaryOp):
         return f"{OP2SYMBOL[type(node.op)]}{node_name(node.operand)}"