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| author | Raymond Hettinger <python@rcn.com> | 2014-05-26 00:25:27 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2014-05-26 00:25:27 (GMT) |
| commit | 978c6abced7f129a66c39135139e60b3e0fa4e0b (patch) | |
| tree | 915451c1f2268193a5160034cd41fc59a4b5d150 /Lib | |
| parent | a2fc99eceae7b3dacc1e7280cc01c3b877ce55ab (diff) | |
| download | cpython-978c6abced7f129a66c39135139e60b3e0fa4e0b.zip cpython-978c6abced7f129a66c39135139e60b3e0fa4e0b.tar.gz cpython-978c6abced7f129a66c39135139e60b3e0fa4e0b.tar.bz2 | |
Issue 13355: Make random.triangular degrade gracefully when low == high.
Diffstat (limited to 'Lib')
| -rw-r--r-- | Lib/random.py | 5 | ||||
| -rw-r--r-- | Lib/test/test_random.py | 2 |
2 files changed, 5 insertions, 2 deletions
diff --git a/Lib/random.py b/Lib/random.py index 174e755a..4642928 100644 --- a/Lib/random.py +++ b/Lib/random.py @@ -355,7 +355,10 @@ class Random(_random.Random): """ u = self.random() - c = 0.5 if mode is None else (mode - low) / (high - low) + try: + c = 0.5 if mode is None else (mode - low) / (high - low) + except ZeroDivisionError: + return low if u > c: u = 1.0 - u c = 1.0 - c diff --git a/Lib/test/test_random.py b/Lib/test/test_random.py index 37a222d..103d462 100644 --- a/Lib/test/test_random.py +++ b/Lib/test/test_random.py @@ -602,7 +602,7 @@ class TestDistributions(unittest.TestCase): for variate, args, expected in [ (g.uniform, (10.0, 10.0), 10.0), (g.triangular, (10.0, 10.0), 10.0), - #(g.triangular, (10.0, 10.0, 10.0), 10.0), + (g.triangular, (10.0, 10.0, 10.0), 10.0), (g.expovariate, (float('inf'),), 0.0), (g.vonmisesvariate, (3.0, float('inf')), 3.0), (g.gauss, (10.0, 0.0), 10.0), |