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import contextlib
import random as python_random
import string
import threading
__default_seed__ = 42
_thread_local = threading.local()
def get_seed():
try:
return _thread_local.seed
except AttributeError:
_thread_local.seed = __default_seed__
return _thread_local.seed
def get_random():
try:
return _thread_local.random
except AttributeError:
_thread_local.random = python_random.Random(get_seed())
return _thread_local.random
random = get_random()
def set_seed(seed):
_thread_local.seed = seed
get_random().seed(seed)
def get_random_string(length):
letters = string.ascii_letters
return "".join(get_random().choice(letters) for _ in range(length))
@contextlib.contextmanager
def nested_seed(sub_seed=None):
old_state = get_random().getstate()
old_global_seed = get_seed()
sub_seed = sub_seed or get_random_string(10)
new_global_seed = str(old_global_seed) + "/" + sub_seed
set_seed(new_global_seed)
try:
yield get_random()
finally:
set_seed(old_global_seed)
get_random().setstate(old_state)
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