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| author | Raymond Hettinger <rhettinger@users.noreply.github.com> | 2022-12-15 18:40:45 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-12-15 18:40:45 (GMT) |
| commit | b430399d41fa88e9040cd055e55cf9211bf63c61 (patch) | |
| tree | a83f25c8bb342a19bbefe8f76208eff2c0f43fc1 | |
| parent | 8356c14b4f81f4d0010afb61610edacf4068b804 (diff) | |
| download | cpython-b430399d41fa88e9040cd055e55cf9211bf63c61.zip cpython-b430399d41fa88e9040cd055e55cf9211bf63c61.tar.gz cpython-b430399d41fa88e9040cd055e55cf9211bf63c61.tar.bz2 | |
GH-100234: Set a default value for random.expovariate() (GH-100235)
| -rw-r--r-- | Doc/library/random.rst | 5 | ||||
| -rw-r--r-- | Lib/random.py | 2 | ||||
| -rw-r--r-- | Lib/test/test_random.py | 1 | ||||
| -rw-r--r-- | Misc/NEWS.d/next/Library/2022-12-14-11-45-38.gh-issue-100234.kn6yWV.rst | 2 |
4 files changed, 8 insertions, 2 deletions
diff --git a/Doc/library/random.rst b/Doc/library/random.rst index 669204b..d944518 100644 --- a/Doc/library/random.rst +++ b/Doc/library/random.rst @@ -320,7 +320,7 @@ be found in any statistics text. ``beta > 0``. Returned values range between 0 and 1. -.. function:: expovariate(lambd) +.. function:: expovariate(lambd = 1.0) Exponential distribution. *lambd* is 1.0 divided by the desired mean. It should be nonzero. (The parameter would be called @@ -328,6 +328,9 @@ be found in any statistics text. range from 0 to positive infinity if *lambd* is positive, and from negative infinity to 0 if *lambd* is negative. + .. versionchanged:: 3.12 + Added the default value for ``lambd``. + .. function:: gammavariate(alpha, beta) diff --git a/Lib/random.py b/Lib/random.py index c70294e..e60b729 100644 --- a/Lib/random.py +++ b/Lib/random.py @@ -577,7 +577,7 @@ class Random(_random.Random): """ return _exp(self.normalvariate(mu, sigma)) - def expovariate(self, lambd): + def expovariate(self, lambd=1.0): """Exponential distribution. lambd is 1.0 divided by the desired mean. It should be diff --git a/Lib/test/test_random.py b/Lib/test/test_random.py index 1e825c35..67de54c 100644 --- a/Lib/test/test_random.py +++ b/Lib/test/test_random.py @@ -988,6 +988,7 @@ class TestDistributions(unittest.TestCase): g.random = x[:].pop; g.uniform(1,10) g.random = x[:].pop; g.paretovariate(1.0) g.random = x[:].pop; g.expovariate(1.0) + g.random = x[:].pop; g.expovariate() g.random = x[:].pop; g.weibullvariate(1.0, 1.0) g.random = x[:].pop; g.vonmisesvariate(1.0, 1.0) g.random = x[:].pop; g.normalvariate(0.0, 1.0) diff --git a/Misc/NEWS.d/next/Library/2022-12-14-11-45-38.gh-issue-100234.kn6yWV.rst b/Misc/NEWS.d/next/Library/2022-12-14-11-45-38.gh-issue-100234.kn6yWV.rst new file mode 100644 index 0000000..6d9b909 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2022-12-14-11-45-38.gh-issue-100234.kn6yWV.rst @@ -0,0 +1,2 @@ +Set a default value of 1.0 for the ``lambd`` parameter in +random.expovariate(). |