Update delattr.md

docs/builtin/delattr.md

@@ -16,6 +16,29 @@ Python delattr() built-in function
   </base-disclaimer-content>
 </base-disclaimer>
 
+```python
+class Person:
+    def __init__(self, name, age):
+        self.name = name
+        self.age = age
+
+>>> person = Person("John", 30)
+>>> delattr(person, 'age')
+>>> person.__dict__
+# {'name': 'John'}
+
+class Car:
+    def __init__(self, make, model):
+        self.make = make
+        self.model = model
+
+>>> car = Car("Toyota", "Corolla")
+>>> try:
+...     delattr(car, 'year')
+... except AttributeError as e:
+...     print(f"Error: {e}")
+# Error: 'Car' object has no attribute 'year'
+```
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