33 lines
1.1 KiB
Python
33 lines
1.1 KiB
Python
"""
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An implementation of a stable bucketing algorithm that can be used
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to reliably group users into experiments.
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An implementation of this is available as a standalone command-line
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tool, `scripts/stable_bucketer`, which can both validate the
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bucketing of a username and generate recognizable usernames for
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particular experiment buckets for testing.
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"""
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import hashlib
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import re
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def stable_bucketing_hash_group(group_name, group_count, username):
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"""
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Return the bucket that a user should be in for a given stable bucketing assignment.
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This function has been verified to return the same values as the stable bucketing
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functions in javascript and the master experiments table.
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Arguments:
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group_name: The name of the grouping/experiment.
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group_count: How many groups to bucket users into.
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username: The username of the user being bucketed.
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"""
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hasher = hashlib.md5()
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hasher.update(group_name.encode('utf-8'))
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hasher.update(username.encode('utf-8'))
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hash_str = hasher.hexdigest()
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return int(re.sub('[8-9a-f]', '1', re.sub('[0-7]', '0', hash_str)), 2) % group_count
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