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analysis_objects.rst

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Analysis objects

An Analysis object is the sole argument to the app function in your app.py module. Its attributes include every strand that can be possibly added to a Twine, although only the strands specified in your twine.py file will not be None. The attributes are:

  • input_values
  • input_manifest
  • configuration_values
  • configuration_manifest
  • output_values
  • output_manifest
  • credentials
  • children
  • monitors

Additionally, all input and configuration attributes are hashed using a BLAKE3 hash so the inputs and configuration that produced a given output in your app can always be verified. These hashes exist on the following attributes:

  • input_values_hash
  • input_manifest_hash
  • configuration_values_hash
  • configuration_manifest_hash

If a strand is None, so will its corresponding hash attribute be. The hash of a datafile is the hash of its file, while the hash of a manifest or dataset is the cumulative hash of the files it refers to.