view roundup/anypy/random_.py @ 7862:5cf8a7027595

doc: vale fixups; clarifications clarify modal workflow, move bulk edit workflow from middle of edit item worflow to after. Clarify postfix expression use with Link items. Add rst() and markdown() to stext() and mark stext as depricated (maybe even this release cycle). More TAL examples. Refill some paragraphs to 65 character lines. Various other fixes pointed out by vale.
author John Rouillard <rouilj@ieee.org>
date Sun, 07 Apr 2024 13:55:01 -0400
parents f002747b6773
children
line wrap: on
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# ruff: noqa: ARG001
try:
    from secrets import choice, randbelow, token_bytes

    def seed(v=None):
        pass

    is_weak = False
except ImportError:
    import os as _os
    import random as _random

    # prefer to use SystemRandom if it is available
    if hasattr(_random, 'SystemRandom'):
        def seed(v=None):
            pass

        _r = _random.SystemRandom()
        is_weak = False
    else:
        # don't completely throw away the existing state, but add some
        # more random state to the existing state
        def seed(v=None):
            # ruff: noqa: PLC0415
            import os
            import time
            _r.seed((_r.getstate(),
                     v,
                     hasattr(os, 'getpid') and os.getpid(),
                     time.time()))

        # create our own instance so we don't mess with the global
        # random number generator
        _r = _random.Random()
        seed()
        is_weak = True

    choice = _r.choice

    def randbelow(i):
        return _r.randint(0, i - 1)

    if hasattr(_os, 'urandom'):
        def token_bytes(size):
            return _os.urandom(size)
    else:
        def token_bytes(size):
            _bchr = chr if str is bytes else lambda x: bytes((x,))
            return b''.join([_bchr(_r.getrandbits(8)) for i in range(size)])

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