AncestryDNA API wrapper

Ancestry exposes an undocumented REST API for its DNA features. This Python wrapper inventories the available calls, and exposes it to novice developers or power users in a more intuitive manner. I have consciously tried to keep the method names and parameters self-explanatory, but included the documentation below if additional context is needed.


Many DNA function calls require you to obtain and input GUIDs corresponding to tests and cousin matches. Later revisions of this wrapper might simplify this process, translating human-readable values to their GUIDs.

This wrapper assumes intermediate knowledge of Python — for example, being able to read the ancestryDnaWrapper class definition, and knowing to input the username and password values to authenticate successfully.


Initializing the ancestryDnaWrapper class will automatically perform authentication. It will authenticate the US-based endpoint by default. This can be overrided with the endpoint keyword argument.

Selecting tests

Any of the group, star, and test require a test to be selected. The wrapper will not default to anything.

  • get_tests — will enumerate all completed tests registered to the account. By default, this will not include any tests shipped, or awaiting processing. To see other tests, change the test_type parameter (default value is complete).
  • use_test — every object returned from get_tests will include a guid property. That property must be inputted to use any latter options. Like the Ancestry UI, you cannot select more than one test.

Test operations

  • get_dna_matches — This will return all DNA matches. Every DNA match will contain a testGuid attribute. The method also contains a shared_with_test_id attribute. To obtain shared matches, input testGuid there.
  • get_admixture— This will return your admixture (e.g. 100% Martian). The method also contains a comparison_guid attribute. To compare admixture with another user, input their testGuid there.

Group operations

  • get_custom_groups — This will return all custom groups you created. If you do not have any, it will return an empty array. Each object will contain tagId attribute — required in any delete or modify operations.
  • create_custom_group — This creates a custom group for you to categorize your matches. Include a name and color value (e.g. #FFFFFF). The response object will include a tagId attribute, needed for addition/deletion operations.
  • delete_custom_group — deletes group corresponding to the tagId. If creating, and then immediately deleting groups, you may encounter eventual consistency issues. Ensure you wait ~ 30 seconds before attempting operations.
  • modify_group_membership — add or remove DNA matches to a custom group. Obtain the testGuid from get_dna_matches and the tagId from create/get_custom_group. Action will be add or remove.

Star operation

  • modify_star — enables you to favorite a match by starring it. Obtain the testGuid from get_dna_matches. Action will be add or remove.


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