学ぶ Automating Simple A/B Test Assignments

Python for Growth Hackers

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A/B testing is a core practice in growth hacking, allowing you to compare two versions of a product, feature, or campaign to see which performs better. To ensure your experiment is fair, it's essential to randomly assign users to test groups—commonly called group "A" and group "B". Without random assignment, your results could be biased, leading to incorrect conclusions about what works best for your users. Python makes this process simple and repeatable, making it a powerful tool for running rapid growth experiments.


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import random

# Hardcoded list of user IDs
user_ids = ["user_1", "user_2", "user_3", "user_4", "user_5", "user_6", "user_7", "user_8", "user_9", "user_10"]

# Dictionary to store assignments
assignments = {}

for user_id in user_ids:
    group = random.choice(['A', 'B'])
    assignments[user_id] = group

print(assignments)

Randomness is crucial in A/B testing because it prevents patterns or external factors from influencing which users end up in each group. In the code above, the random.choice function from Python's random module assigns each user to either group "A" or "B" without bias. This approach ensures that any difference in performance between groups is likely due to the change being tested, not to differences in the users themselves.


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# Count users in each group
group_a_count = list(assignments.values()).count('A')
group_b_count = list(assignments.values()).count('B')

print("Number of users in group A:", group_a_count)
print("Number of users in group B:", group_b_count)

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セクション 1. 章 6

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セクション 1. 章 6

Automating Simple A/B Test Assignments

1. Why is random assignment important in A/B testing?

2. Which Python module is used for generating random choices?

3. How can you verify that groups are balanced after assignment?