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annotate roundup/anypy/random_.py @ 6476:10a8a6bc4667

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Change spacing for file addition; larger comment block; top label Add padding to file input not the close button. This groups the clear button with its file input. Comment block becomes larger. In table layout, make header and data align to top of cell. Add padding to in table headers, makes the rows easier to scan.
author John Rouillard <rouilj@ieee.org>
date Sat, 28 Aug 2021 21:43:11 -0400
parents adf54478cdaf
children 07ce4e4110f5
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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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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, time
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24 _r.seed((_r.getstate(),
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25 v,
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26 hasattr(os, 'getpid') and os.getpid(),
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27 time.time()))
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28
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29 # create our own instance so we don't mess with the global
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30 # random number generator
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31 _r = _random.Random()
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32 seed()
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33 is_weak = True
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34
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35 choice = _r.choice
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36
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37 def randbelow(i):
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38 return _r.randint(0, i - 1)
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39
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40 if hasattr(_os, 'urandom'):
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41 def token_bytes(l):
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42 return _os.urandom(l)
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43 else:
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44 def token_bytes(l):
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45 _bchr = chr if str == bytes else lambda x: bytes((x,))
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46 return b''.join([_bchr(_r.getrandbits(8)) for i in range(l)])
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