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(python2.1-ref.info)Reserved classes of identifiers

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Reserved classes of identifiers
-------------------------------

Certain classes of identifiers (besides keywords) have special
meanings.  These are:

Form                     Meaning                  Notes
------                   -----                    -----
_*                       Not imported by `from    (1)
                         MODULE import *'         
__*__                    System-defined name      
__*                      Class-private name       
                         mangling                 

(XXX need section references here.)

Note:

`(1)'
     The special identifier `_' is used in the interactive interpreter
     to store the result of the last evaluation; it is stored in the
     `__builtin__' module.  When not in interactive mode, `_' has no
     special meaning and is not defined.