I think developers coming to Python from other languages (like I am from a heavy Java background) find the auto-creation of "shadow variables" pretty interesting. To someone used to Java, being able to access a private member via its shadow variable is a lot like black magic.
Discovering this for the first time in Python seemed pretty cool to me. I really hope this feeling of magic in working with Python never leaves me. I want to remain amazed.
Coming from C++, this is very similar to what all C++ compilers do internally (i.e. name mangling). Python just opens a possibility to access that "mangled" names directly, which should never be necessary unless you are doing some metaprogramming and need full access to class internals.
Discovering this for the first time in Python seemed pretty cool to me. I really hope this feeling of magic in working with Python never leaves me. I want to remain amazed.