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| -rw-r--r-- | Doc/library/random.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/library/random.rst b/Doc/library/random.rst index 7c5b9e5..6dc54d2 100644 --- a/Doc/library/random.rst +++ b/Doc/library/random.rst @@ -329,6 +329,9 @@ population with repeats:: >>> weighted_choices = [('Red', 3), ('Blue', 2), ('Yellow', 1), ('Green', 4)] >>> population = [val for val, cnt in weighted_choices for i in range(cnt)] + >>> population + ['Red', 'Red', 'Red', 'Blue', 'Blue', 'Yellow', 'Green', 'Green', 'Green', 'Green'] + >>> random.choice(population) 'Green' @@ -338,6 +341,9 @@ with :func:`itertools.accumulate`, and then locate the random value with >>> choices, weights = zip(*weighted_choices) >>> cumdist = list(itertools.accumulate(weights)) + >>> cumdist # [3, 3+2, 3+2+1, 3+2+1+4] + [3, 5, 6, 10] + >>> x = random.random() * cumdist[-1] >>> choices[bisect.bisect(cumdist, x)] 'Blue' |