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annotate roundup/anypy/random_.py @ 5920:ff7e089fd4ef

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support python 3.4 testing python 3.4 is not supported by any 1.4 release of mysqlclient. Pip is installing the 1.4.4 version even when run from python 3.4. Check version and install 1.3.14 on python 3.4 but newest one on all other versions.
author John Rouillard <rouilj@ieee.org>
date Sun, 13 Oct 2019 14:17:33 -0400
parents 52cb53eedf77
children adf54478cdaf
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1 try:
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2 from secrets import choice, randbelow, token_bytes
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3 def seed(v = None):
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4 pass
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5
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6 is_weak = False
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7 except ImportError:
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8 import os as _os
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9 import random as _random
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10
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11 # prefer to use SystemRandom if it is available
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12 if hasattr(_random, 'SystemRandom'):
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13 def seed(v = None):
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14 pass
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15
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16 _r = _random.SystemRandom()
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17 is_weak = False
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18 else:
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19 # don't completely throw away the existing state, but add some
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20 # more random state to the existing state
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21 def seed(v = None):
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22 import os, time
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23 _r.seed((_r.getstate(),
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24 v,
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25 hasattr(os, 'getpid') and os.getpid(),
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26 time.time()))
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27
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28 # create our own instance so we don't mess with the global
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29 # random number generator
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30 _r = _random.Random()
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31 seed()
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32 is_weak = True
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33
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34 choice = _r.choice
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35
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36 def randbelow(i):
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37 return _r.randint(0, i - 1)
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38
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39 if hasattr(_os, 'urandom'):
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40 def token_bytes(l):
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41 return _os.urandom(l)
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42 else:
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43 def token_bytes(l):
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44 _bchr = chr if str == bytes else lambda x: bytes((x,))
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45 return b''.join([_bchr(_r.getrandbits(8)) for i in range(l)])
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