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random_basic.py

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try:

import random

except ImportError:

print("SKIP")

raise SystemExit

# check getrandbits returns a value within the bit range

for b in (1, 2, 3, 4, 16, 32):

for i in range(50):

assert random.getrandbits(b) < (1 << b)

# check that seed(0) gives a non-zero value

random.seed(0)

print(random.getrandbits(16) != 0)

# check that PRNG is repeatable

random.seed(1)

r = random.getrandbits(16)

random.seed(1)

print(random.getrandbits(16) == r)

# check that zero bits works

print(random.getrandbits(0))

# check that it throws an error for negative bits

try:

random.getrandbits(-1)

except ValueError:

print("ValueError")