*** ref4.tex.cvs	Sat Sep 24 17:52:34 2005
--- ref4.tex	Sat Sep 24 18:56:10 2005
***************
*** 97,106 ****
  The built-in namespace associated with the execution of a code block
  is actually found by looking up the name \code{__builtins__} in its
  global namespace; this should be a dictionary or a module (in the
! latter case the module's dictionary is used).  Normally, the
! \code{__builtins__} namespace is the dictionary of the built-in module
! \module{__builtin__} (note: no `s').  If it isn't, restricted
! execution\indexii{restricted}{execution} mode is in effect.
  
  The namespace for a module is automatically created the first time a
  module is imported.  The main module for a script is always called
--- 97,114 ----
  The built-in namespace associated with the execution of a code block
  is actually found by looking up the name \code{__builtins__} in its
  global namespace; this should be a dictionary or a module (in the
! latter case the module's dictionary is used).  By default, when in
! the \module{__main__} module, \code{__builtins__} is the dictionary
! of the built-in module \module{__builtin__} (note: no `s');  when in
! any other module, \code{__builtins__} is an alias for the
! \module{__builtin__} module itself.  \code{__builtins__} can be set
! to a user-created dictionary to create a weak form of restricted
! execution\indexii{restricted}{execution}.
! 
! Note that users should not touch \code{__builtins__};  it is merely an
! implementation detail.  Users wanting to override built-in functions
! and the like should \keyword{import} the \module{__builtin__}
! (no 's') module and modify its attributes appropriately.
  
  The namespace for a module is automatically created the first time a
  module is imported.  The main module for a script is always called