.. data:: environ
- A mapping object representing the string environment. For example,
+ A :term:`mapping` object representing the string environment. For example,
``environ['HOME']`` is the pathname of your home directory (on some platforms),
and is equivalent to ``getenv("HOME")`` in C.
statement: del
builtin: len
-A :dfn:`mapping` object maps :term:`hashable` values to arbitrary objects.
+A :term:`mapping` object maps :term:`hashable` values to arbitrary objects.
Mappings are mutable objects. There is currently only one standard mapping
type, the :dfn:`dictionary`. (For other containers see the built in
:class:`list`, :class:`set`, and :class:`tuple` classes, and the