How to get automatic caption numbering?

[lilyzhaochina]

the same as #87 #180 #590 #511 #554 #25.
Anybody help?This seems to solve this problem, but there is no example, it is difficult to understand.

Here is the descrprition about number from https://python-docx.readthedocs.io/en/latest/user/styles-understanding.html.

Identifying a style¶
A style has three identifying properties, name, style_id, and type.

Each style’s name property is its stable, unique identifier for access purposes.

A style’s style_id is used internally to key a content object such as a paragraph to its style. However this value is generated automatically by Word and is not guaranteed to be stable across saves. In general, the style id is formed simply by removing spaces from the localized style name, however there are exceptions. Users of python-docx should generally avoid using the style id unless they are confident with the internals involved.

A style’s type is set at creation time and cannot be changed.

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Got any hit @lilyzhaochina ?