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cpython/Lib/test/test_random.py

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Get rid of relative imports in all unittests. Now anything that imports e.g. test_support must do so using an absolute package name such as "import test.test_support" or "from test import test_support". This also updates the README in Lib/test, and gets rid of the duplicate data dirctory in Lib/test/data (replaced by Lib/email/test/data). Now Tim and Jack can have at it. :)
2002-07-23 16:04:11 -03:00
from test import test_support
random.gauss() uses a piece of hidden state used by nothing else, and the .seed() and .whseed() methods failed to reset it. In other words, setting the seed didn't completely determine the sequence of results produced by random.gauss(). It does now. Programs repeatedly mixing calls to a seed method with calls to gauss() may see different results now. Bugfix candidate (random.gauss() has always been broken in this way), despite that it may change results.
2002-05-05 17:40:00 -03:00
import random
# Ensure that the seed() method initializes all the hidden state. In
# particular, through 2.2.1 it failed to reset a piece of state used by
# (and only by) the .gauss() method.
for seed in 1, 12, 123, 1234, 12345, 123456, 654321:
for seeder in random.seed, random.whseed:
seeder(seed)
x1 = random.random()
y1 = random.gauss(0, 1)
seeder(seed)
x2 = random.random()
y2 = random.gauss(0, 1)
test_support.vereq(x1, x2)
test_support.vereq(y1, y2)