Merged revisions 68378 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r68378 | mark.dickinson | 2009-01-07 17:48:33 +0000 (Wed, 07 Jan 2009) | 2 lines
Issue #4869: clarify documentation for random.expovariate.
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diff --git a/Lib/random.py b/Lib/random.py
index 70603ca..95f4411 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -396,9 +396,11 @@
def expovariate(self, lambd):
"""Exponential distribution.
- lambd is 1.0 divided by the desired mean. (The parameter would be
- called "lambda", but that is a reserved word in Python.) Returned
- values range from 0 to positive infinity.
+ lambd is 1.0 divided by the desired mean. It should be
+ nonzero. (The parameter would be called "lambda", but that is
+ a reserved word in Python.) Returned values range from 0 to
+ positive infinity if lambd is positive, and from negative
+ infinity to 0 if lambd is negative.
"""
# lambd: rate lambd = 1/mean