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SF bug #812202: randint is always even

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* Added C coded getrandbits(k) method that runs in linear time.
* Call the new method from randrange() for ranges >= 2**53.
* Adds a warning for generators not defining getrandbits() whenever they
  have a call to randrange() with too large of a population.
This commit is contained in:
Raymond Hettinger 2003-10-05 09:09:15 +00:00
parent 5c68ef04b7
commit 2f726e9093
5 changed files with 196 additions and 10 deletions
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@ -84,6 +84,14 @@ Library
seed. Modified to match Py2.2 behavior and use fractional seconds so
that successive runs are more likely to produce different sequences.
- random.Random has a new method, getrandbits(k), which returns an int
with k random bits. This method is now an optional part of the API
for user defined generators. Any generator that defines genrandbits()
can now use randrange() for ranges with a length >= 2**53. Formerly,
randrange would return only even numbers for ranges that large (see
SF bug #812202). Generators that do not define genrandbits() now
issue a warning when randrange() is called with a range that large.
- itertools.izip() with no arguments now returns an empty iterator instead
of raising a TypeError exception.