diff options
| -rw-r--r-- | Lib/random.py | 9 | ||||
| -rw-r--r-- | Misc/NEWS.d/next/Library/2019-04-09-12-02-35.bpo-36559.LbDRrw.rst | 2 |
2 files changed, 10 insertions, 1 deletions
diff --git a/Lib/random.py b/Lib/random.py index 79ef30d..53981f3 100644 --- a/Lib/random.py +++ b/Lib/random.py @@ -42,11 +42,18 @@ from math import log as _log, exp as _exp, pi as _pi, e as _e, ceil as _ceil from math import sqrt as _sqrt, acos as _acos, cos as _cos, sin as _sin from os import urandom as _urandom from _collections_abc import Set as _Set, Sequence as _Sequence -from hashlib import sha512 as _sha512 from itertools import accumulate as _accumulate, repeat as _repeat from bisect import bisect as _bisect import os as _os +try: + # hashlib is pretty heavy to load, try lean internal module first + from _sha512 import sha512 as _sha512 +except ImportError: + # fallback to official implementation + from hashlib import sha512 as _sha512 + + __all__ = ["Random","seed","random","uniform","randint","choice","sample", "randrange","shuffle","normalvariate","lognormvariate", "expovariate","vonmisesvariate","gammavariate","triangular", diff --git a/Misc/NEWS.d/next/Library/2019-04-09-12-02-35.bpo-36559.LbDRrw.rst b/Misc/NEWS.d/next/Library/2019-04-09-12-02-35.bpo-36559.LbDRrw.rst new file mode 100644 index 0000000..2f6ee78 --- /dev/null +++ b/Misc/NEWS.d/next/Library/2019-04-09-12-02-35.bpo-36559.LbDRrw.rst @@ -0,0 +1,2 @@ +The random module now prefers the lean internal _sha512 module over hashlib +for seed(version=2) to optimize import time. |