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annotate roundup/anypy/random_.py @ 7471:a4987f5ebee0

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Add padding around code examples. They were all squished against the edges of the box. This makes them less squished and prevents overlap of bottom scroll bar with the bottom row of text.
author John Rouillard <rouilj@ieee.org>
date Thu, 08 Jun 2023 01:33:16 -0400
parents 07ce4e4110f5
children f002747b6773
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 try:
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2 from secrets import choice, randbelow, token_bytes
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3
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4 def seed(v=None):
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5 pass
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6
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7 is_weak = False
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8 except ImportError:
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9 import os as _os
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10 import random as _random
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11
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12 # prefer to use SystemRandom if it is available
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13 if hasattr(_random, 'SystemRandom'):
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14 def seed(v=None):
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15 pass
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16
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17 _r = _random.SystemRandom()
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18 is_weak = False
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19 else:
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20 # don't completely throw away the existing state, but add some
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21 # more random state to the existing state
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22 def seed(v=None):
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23 import os
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24 import time
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25 _r.seed((_r.getstate(),
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26 v,
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27 hasattr(os, 'getpid') and os.getpid(),
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28 time.time()))
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29
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30 # create our own instance so we don't mess with the global
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31 # random number generator
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32 _r = _random.Random()
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33 seed()
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34 is_weak = True
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35
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36 choice = _r.choice
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37
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38 def randbelow(i):
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39 return _r.randint(0, i - 1)
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40
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41 if hasattr(_os, 'urandom'):
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42 def token_bytes(l):
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43 return _os.urandom(l)
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44 else:
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45 def token_bytes(l):
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46 _bchr = chr if str == bytes else lambda x: bytes((x,))
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47 return b''.join([_bchr(_r.getrandbits(8)) for i in range(l)])
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