How to use 'random distribution' in Python

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def random_distribution(total_requests, num_threads):
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    """
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    Return a list with a random distribution of
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    requests per thread. For returned list L and
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    thread index i, L[i] represents the number
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    of requests (randomly assigned) to thread i.
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    """
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    requests_per_thread = [0] * num_threads
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    while total_requests > 0:
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        for i in range(num_threads):
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            if random.choice( (True, False) ):
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                requests_per_thread[i] += 1
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                total_requests -=  1
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    return requests_per_thread

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def _random(a, size=None):
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    return stats.dirichlet.rvs(a, None if size == a.shape else size)