I want to persist an index to storage

I want to persist an index to storage (directory). I also want to be able to load that index from storage when I rerun my script.

But what happens on the first run, when no index has been created? what will load_index_from_storage(storage_context) return?

In other words, I want to:

Plain Text

    index = load_index_from_storage(storage_context)
    if(#WHEN INDEX IS NOT TRUTHY / ON FIRST RUN#):
      index = ListIndex.from_defaults(...)
      index.persist()

so I can load the index, or create it on first run.

Suggestions?

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I want to persist an index to storage