Not all .PY files are compiled to .PYC during execution

[Tony C]

After using Python for just over a year now, I've noticed something
for the first time.

I've written an application in one .PY file, and a class definition in
another.PY file. (The application instantiates one instance of the
class.)

When I run my application as in

python myapp.py

the file which contains the class definition (class.py), is compiled
to a .PYC file, but the application (myapp.py) is not.

Why is the application file not compiled to .PYC  ?

thanks