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v0.5.1
v0.5.1
https://github.com/python/cpython
Revision dae5d728bc3f1d4039b64e4ec3a9036fd5d19587 authored by Miss Islington (bot) on 10 November 2020, 19:58:27 UTC, committed by GitHub on 10 November 2020, 19:58:27 UTC
Fix an assertion error in format() in debug build for floating point formatting with "n" format, zero padding and small width. Release build is not impacted. Patch by Karthikeyan Singaravelan. (cherry picked from commit 3f7983a25a3d19779283c707fbdd5bc91b1587ef) Co-authored-by: Xtreak <tir.karthi@gmail.com>
1 parent a63234c
Tip revision: dae5d728bc3f1d4039b64e4ec3a9036fd5d19587 authored by Miss Islington (bot) on 10 November 2020, 19:58:27 UTC
bpo-35560: Remove assertion from format(float, "n") (GH-11288) (GH-23231)
bpo-35560: Remove assertion from format(float, "n") (GH-11288) (GH-23231)
Tip revision: dae5d72
secrets.py
"""Generate cryptographically strong pseudo-random numbers suitable for
managing secrets such as account authentication, tokens, and similar.
See PEP 506 for more information.
https://www.python.org/dev/peps/pep-0506/
"""
__all__ = ['choice', 'randbelow', 'randbits', 'SystemRandom',
'token_bytes', 'token_hex', 'token_urlsafe',
'compare_digest',
]
import base64
import binascii
import os
from hmac import compare_digest
from random import SystemRandom
_sysrand = SystemRandom()
randbits = _sysrand.getrandbits
choice = _sysrand.choice
def randbelow(exclusive_upper_bound):
"""Return a random int in the range [0, n)."""
if exclusive_upper_bound <= 0:
raise ValueError("Upper bound must be positive.")
return _sysrand._randbelow(exclusive_upper_bound)
DEFAULT_ENTROPY = 32 # number of bytes to return by default
def token_bytes(nbytes=None):
"""Return a random byte string containing *nbytes* bytes.
If *nbytes* is ``None`` or not supplied, a reasonable
default is used.
>>> token_bytes(16) #doctest:+SKIP
b'\\xebr\\x17D*t\\xae\\xd4\\xe3S\\xb6\\xe2\\xebP1\\x8b'
"""
if nbytes is None:
nbytes = DEFAULT_ENTROPY
return os.urandom(nbytes)
def token_hex(nbytes=None):
"""Return a random text string, in hexadecimal.
The string has *nbytes* random bytes, each byte converted to two
hex digits. If *nbytes* is ``None`` or not supplied, a reasonable
default is used.
>>> token_hex(16) #doctest:+SKIP
'f9bf78b9a18ce6d46a0cd2b0b86df9da'
"""
return binascii.hexlify(token_bytes(nbytes)).decode('ascii')
def token_urlsafe(nbytes=None):
"""Return a random URL-safe text string, in Base64 encoding.
The string has *nbytes* random bytes. If *nbytes* is ``None``
or not supplied, a reasonable default is used.
>>> token_urlsafe(16) #doctest:+SKIP
'Drmhze6EPcv0fN_81Bj-nA'
"""
tok = token_bytes(nbytes)
return base64.urlsafe_b64encode(tok).rstrip(b'=').decode('ascii')
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