Core container as singletone for entire app

[VasyaGaikin]

App Package (Container) Diagramm

The CoreContainer container contains:

class CoreContainer( containers.DeclarativeContainer ):
    arguments = providers.Resource( parse_arguments )
    config = providers.Resource( parse_config, arguments=arguments )

    _logging = providers.Resource( init_logging,
                                   arguments=arguments,
                                   config=config )

    logger_factory = providers.Factory( logging.getLogger ).provider

The main question is about CoreContainer. Is there a way to make it
share for the entire application? The only way I found is when
importing top-level containers (CleanContainer, DatabaseInitContainer,
ParseContainer, ...) specify the CoreContainer as a
dependency and pass it into the child containers.

when I do this:

class DatabaseContainer( containers.DeclarativeContainer ):
    core: CoreContainer = providers.Container( CoreContainer )
    ...

class DownloadContainer( containers.DeclarativeContainer ):
    core: CoreContainer = providers.Container( CoreContainer )
    ...

class ParseContainer( containers.DeclarativeContainer ):
    core: CoreContainer = providers.Container( CoreContainer )

then all elements in CoreContainer are initialized multiple times.
It was it would be convenient if the container itself was like a
Singletone for the entire application.

[beaudrychase]

This looks like a good use case for providers.DependenciesContainer
Maybe something like this:

class DatabaseContainer( containers.DeclarativeContainer ):
    core: CoreContainer = providers.DependenciesContainer( CoreContainer )
    ...

class DownloadContainer( containers.DeclarativeContainer ):
    core: CoreContainer = providers.DependenciesContainer( CoreContainer )
    ...

class ParseContainer( containers.DeclarativeContainer ):
    core: CoreContainer = providers.CoreContainer( CoreContainer )

Then constructing the containers would look something like this:

core = CoreContainer()
database = DatabaseContainer(core=core)
download = DownloadContainer(core=core)
parse = ParseContainer(core=core)

This would only require one instance of the CoreContainer. You may have to massage this example code a bit before it works, but I think this is the problem DependenciesContainer is designed to solve.