pass, EOFError

http://docs.python.org/release/2.5.2/ref/pass.html

pass is a null operation -- when it is executed, nothing happens. It is useful as a placeholder when a statement is required
syntactically, but no code needs to be executed, for example:

def f(arg): pass    # a function that does nothing (yet)class C: pass       # a class with no methods (yet)

http://docs.python.org/2/library/exceptions.html

exception EOFError

Raised when one of the built-in functions (input() or raw_input()) hits an end-of-file condition (EOF) without reading any data. (N.B.: the file.read() and file.readline() methods return an empty string when they hit EOF.)