2.3.2 Reserved classes of identifiers
Certain classes of identifiers (besides keywords) have special
meanings. These are:
|Not imported by "from module import *"
|Class-private name mangling
(XXX need section references here.)
- 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.
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