`Parser` is used by many plugins and custom hooks. `OptionGroup` is exposed by the `parser.addgroup` API. The constructors of both are marked private, they are not meant to be constructed directly.  | 
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| .. | ||
| customize.rst | ||
| exit-codes.rst | ||
| fixtures.rst | ||
| index.rst | ||
| plugin_list.rst | ||
| reference.rst | ||