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annotate roundup/anypy/random_.py @ 8264:09e8d1a4c796

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docs: clarify wording, fix index, add superseder link Make superseder, messages etc. properties index entries point to the right place. Link to description of using Superseder in the original overview. fix bad wording on boolean properties.
author John Rouillard <rouilj@ieee.org>
date Wed, 08 Jan 2025 11:39:54 -0500
parents f002747b6773
children
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1 # ruff: noqa: ARG001
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2 try:
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3 from secrets import choice, randbelow, token_bytes
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4
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5 def seed(v=None):
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6 pass
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7
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8 is_weak = False
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9 except ImportError:
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10 import os as _os
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11 import random as _random
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12
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13 # prefer to use SystemRandom if it is available
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14 if hasattr(_random, 'SystemRandom'):
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15 def seed(v=None):
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16 pass
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17
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18 _r = _random.SystemRandom()
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19 is_weak = False
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20 else:
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21 # don't completely throw away the existing state, but add some
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22 # more random state to the existing state
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23 def seed(v=None):
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24 # ruff: noqa: PLC0415
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25 import os
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26 import time
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27 _r.seed((_r.getstate(),
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28 v,
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29 hasattr(os, 'getpid') and os.getpid(),
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30 time.time()))
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31
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32 # create our own instance so we don't mess with the global
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33 # random number generator
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34 _r = _random.Random()
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35 seed()
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36 is_weak = True
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37
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38 choice = _r.choice
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39
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40 def randbelow(i):
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41 return _r.randint(0, i - 1)
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42
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43 if hasattr(_os, 'urandom'):
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44 def token_bytes(size):
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45 return _os.urandom(size)
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46 else:
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47 def token_bytes(size):
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48 _bchr = chr if str is bytes else lambda x: bytes((x,))
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49 return b''.join([_bchr(_r.getrandbits(8)) for i in range(size)])
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