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import hashlib
import random as python_random
from typing import Any, Hashable
from .settings_utils import get_settings
settings = get_settings()
def get_seed():
return settings.seed
def new_random_generator(sub_seed: Any) -> python_random.Random:
"""Get a generator based on a seed derived from the default seed.
The purpose is to have a random generator that provides outputs
that are independent of previous randomizations.
"""
if not isinstance(sub_seed, Hashable):
# e.g. for lists or dicts
# Create a persistent hash for the input object (using plain hash(..) produces
# a value that varies between runs)
sub_seed_str = str(sub_seed).encode("utf-8")
# limit the hash int size to 2^32
sub_seed_hexdigest = hashlib.md5(sub_seed_str).hexdigest()[:8]
# convert to int, from base 16:
sub_seed_int = int(sub_seed_hexdigest, 16)
sub_seed = str(sub_seed_int)
elif not isinstance(sub_seed, str):
# for Hashable objects that are not strings
sub_seed = str(hash(sub_seed))
sub_default_seed = str(settings.seed) + "/" + sub_seed
return python_random.Random(sub_default_seed)
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