feat: add example of how to use python helpers (#53908)

curriculum/challenges/_meta/learn-python-by-building-a-blackjack-game/meta.json

@@ -27,6 +27,10 @@
     {
       "id": "64b171849f925b0773aa434c",
       "title": "Step 4"
+    },
+    {
+      "id": "65df3afd233057f6a620a860",
+      "title": "Step 5"
     }
   ]
-}
+}

curriculum/challenges/english/20-upcoming-python/learn-python-by-building-a-blackjack-game/65df3afd233057f6a620a860.md

@@ -0,0 +1,53 @@
+---
+id: 65df3afd233057f6a620a860
+title: Step 5
+challengeType: 20
+dashedName: step-5
+---
+
+# --description--
+
+This shows how the helper functions can be used to analyze a learner's class definitions
+
+# --instructions--
+
+We can just find the class definition inside Python, return it to the JavaScript, and then check if it contains the string "pass".
+
+If we need something more reliable, we can expand the helpers to check for pass statements specifically. This would be useful if say, we wanted to write classes containing, say, passengers.
+
+# --hints--
+
+`TreeNode` should not contain any `pass` statements.
+
+```js
+({ test: () => {
+  const pyClassStr = runPython(`str(_Node(_code).find_class("TreeNode"))`);
+  assert.notInclude(pyClassStr, "pass")
+}})
+```
+
+# --seed--
+
+## --seed-contents--
+
+```py
+--fcc-editable-region--
+class TreeNode:
+    pass
+  
+class Trap:
+    pass
+--fcc-editable-region--
+```
+
+# --solutions--
+
+```py
+class TreeNode:
+    def __init__(self, thing):
+        self.thing = thing
+        
+class Trap:
+    pass
+  
+```