[issue9051] Improve pickle format for timezone aware datetime instances

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

For stability it is better to use public name 'timezone.utc' instead of '_utc'. Dotted names now are supported with all protocols.

> but there is still room for improvement:

Don't worry about this. When you pickle a number of datetime objects with the same timezone, the timezone is pickled only once and for all other datetime objects only a reference is used.

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nosy: +serhiy.storchaka
type: behavior -> enhancement
versions: +Python 3.6 -Python 3.5

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