Add an option to remove unused requests from cassette #763
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Introduce the `drop_unused_requests` option (False by default). If True, it will force the `Cassette` saving operation with only played old interactions and new ones if they exist. As a result, unused old requests are dropped. Add `_old_interactions`, `_played_interactions` and `_new_interactions()`. The `_old_interactions` are previously recorded interactions loaded from Cassette files. The `_played_interactions` is a set of old interactions that were marked as played. A new interaction is a tuple (request, response) in `self.data` that is not in `_old_interactions` list.
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This PR adds an option to remove previously recorded interactions if they are not used. I believe this feature can address the issue discussed in #208. We don't need to focus on ignoring all requests in the cassette file, but instead, we can write to file only replayed interactions and new ones. If no previous request is used, VCR will save only new interactions.
There is a similar feature in Ruby VCR.
Replaces #677