view roundup/anypy/random_.py @ 7800:2d4684e4702d

fix: enhancement to history command output and % template fix. Rather than using the key field, use the label field for descriptions. Call cls.labelprop(default_to_id=True) so it returns id rather than the first sorted property name. If labelprop() returns 'id' or 'title', we return nothing. 'id' means there is no label set and no properties named 'name' or 'title'. So have the caller do whatever it wants (prepend classname for example) when there is no human readable name. This prevents %(name)s%(key)s from producing: 23(23). Also don't accept the 'title' property. Titles can be too long. Arguably we could: '%(name)20s' to limit the title length. However without ellipses or something truncating the title might be confusing. So again pretend there is no human readable name.
author John Rouillard <rouilj@ieee.org>
date Tue, 12 Mar 2024 11:52:17 -0400
parents f002747b6773
children
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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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