NameError: name 'execfile' is not defined

[Henrik Bechmann]

Newbie issue:

I downloaded http://www.python.org/download/releases/3.0.1/ (windows
insaller), opened the interpreter, wrote a print "Hello World" program
in helloworld.py, and in the interpreter typed

execfile("helloworld.py")

Got back

NameError: name 'execfile' is not defined

(following tutorial in David Beazley's Python Essential Reference).

Is execfile not supported in 3?

Thanks,

- Henrik