fix(curriculum): explain callable() in dynamic attributes lecture (#67360)

curriculum/challenges/english/blocks/lecture-classes-and-objects/6908d38f7cccc31602743340.md

@@ -97,6 +97,8 @@ for attr in dir(person):
 # name: John Doe
 ```
 
+In the loop above, `callable()` is a built-in function that returns `True` if the object passed to it can be called like a function or method, and `False` otherwise. By checking `not callable(getattr(person, attr))`, the loop skips over methods and only prints the data attributes like `name` and `age`.
+
 The `setattr()` function lets you create a new attribute or update an existing one dynamically. The syntax looks like this: 
 
 ```python