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| -rw-r--r-- | Lib/random.py | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/Lib/random.py b/Lib/random.py index 221bef6..d95c324 100644 --- a/Lib/random.py +++ b/Lib/random.py @@ -15,9 +15,55 @@ # Translated from anonymously contributed C/C++ source. +import whrandom from whrandom import random, uniform, randint, choice # Also for export! from math import log, exp, pi, e, sqrt, acos, cos, sin +# Interfaces to replace remaining needs for importing whrandom +# XXX TO DO: make the distribution functions below into methods. + +def makeseed(a=None): + """Turn a hashable value into three seed values for whrandom.seed(). + + None or no argument returns (0, 0, 0), to seed from current time. + + """ + if a is None: + return (0, 0, 0) + a = hash(a) + a, x = divmod(a, 256) + a, y = divmod(a, 256) + a, z = divmod(a, 256) + x = (x + a) % 256 or 1 + y = (y + a) % 256 or 1 + z = (z + a) % 256 or 1 + return (x, y, z) + +def seed(a=None): + """Seed the default generator from any hashable value. + + None or no argument returns (0, 0, 0) to seed from current time. + + """ + x, y, z = makeseed(a) + whrandom.seed(x, y, z) + +class generator(whrandom.whrandom): + """Random generator class.""" + + def __init__(self, a=None): + """Constructor. Seed from current time or hashable value.""" + self.seed(a) + + def seed(self, a=None): + """Seed the generator from current time or hashable value.""" + x, y, z = makeseed(a) + whrandom.whrandom.seed(self, x, y, z) + +def new_generator(a=None): + """Return a new random generator instance.""" + return generator(a) + # Housekeeping function to verify that magic constants have been # computed correctly |