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bpo-43443: Clarify difference between shelve objects and dicts (GH-27004) (GH-27369)

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(cherry picked from commit c97c2a050c)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2021-07-26 12:32:36 -07:00 • committed by GitHub
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Doc/library/shelve.rst
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@ -60,7 +60,8 @@ lots of shared sub-objects. The keys are ordinary strings.
to load a shelf from an untrusted source. Like with pickle, loading a shelf
can execute arbitrary code.
Shelf objects support all methods supported by dictionaries. This eases the
Shelf objects support most of methods and operations supported by dictionaries
(except copying, constructors and operators ``|`` and ``|=``). This eases the
transition from dictionary based scripts to those requiring persistent storage.
Two additional methods are supported: