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bpo-32554: Deprecate hashing arbitrary types in random.seed() (GH-15382)

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Raymond Hettinger 2019-08-22 09:19:36 -07:00 • committed by GitHub
parent 4109263a7e
commit d0cdeaab76
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4 changed files with 30 additions and 2 deletions
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15
Lib/random.py
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@ -121,7 +121,10 @@ class Random(_random.Random):
break
def seed(self, a=None, version=2):
"""Initialize internal state from hashable object.
"""Initialize internal state from a seed.
The only supported seed types are None, int, float,
str, bytes, and bytearray.
None or no argument seeds from current time or from an operating
system specific randomness source if available.
@ -143,12 +146,20 @@ class Random(_random.Random):
x ^= len(a)
a = -2 if x == -1 else x
if version == 2 and isinstance(a, (str, bytes, bytearray)):
elif version == 2 and isinstance(a, (str, bytes, bytearray)):
if isinstance(a, str):
a = a.encode()
a += _sha512(a).digest()
a = int.from_bytes(a, 'big')
elif not isinstance(a, (type(None), int, float, str, bytes, bytearray)):
_warn('Seeding based on hashing is deprecated\n'
'since Python 3.9 and will be removed in a subsequent '
'version. The only \n'
'supported seed types are: None, '
'int, float, str, bytes, and bytearray.',
DeprecationWarning, 2)
super().seed(a)
self.gauss_next = None