Why must implementing Python be hard unlike Scheme?

[seberino at spawar.navy.mil]

I'm learning Scheme and I am amazed how easy it is to start building a
half baked Scheme implementation that somewhat works.

After knowing Python for *years* I have no idea how to actually
implement the darn thing.

Does this have to be true?  Beneath the more complex syntax are there
a few core design principles/objects/relationships to help in grokking
the whole thing? Got any related links?

Certainly, "(almost) everything is an object" is a good start.  Are
there any other axiom like statements one can hang their hat on when
trying to wrap their brain around Python's architecture?

Chris