Lib/random.py: use more efficient code to convert bytes to integer

[vstinner]

BPO	21394
Nosy	@vstinner, @PCManticore

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2014-04-30.22:33:31.734>
created_at = <Date 2014-04-30.10:07:47.595>
labels = ['easy', 'performance']
title = 'Lib/random.py: use more efficient code to convert bytes to integer'
updated_at = <Date 2014-04-30.22:33:31.733>
user = 'https://github.com/vstinner'

bugs.python.org fields:

activity = <Date 2014-04-30.22:33:31.733>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2014-04-30.22:33:31.734>
closer = 'vstinner'
components = []
creation = <Date 2014-04-30.10:07:47.595>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 21394
keywords = ['easy']
message_count = 3.0
messages = ['217595', '217599', '217663']
nosy_count = 2.0
nosy_names = ['vstinner', 'Claudiu.Popa']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue21394'
versions = ['Python 3.5']

[vstinner]

In Lib/random.py, I see lines like that:

long(_hexlify(_urandom(32)), 16)

I guess that something more efficient can be fonud to convert a bytes string to an integer.

bytes.from_bytes() maybe?

[PCManticore]

Do you mean int.from_bytes?

It's already changed in Python 3.5: int.from_bytes(_urandom(32), 'big').

[vstinner]

Oops, I didn't read the right version of the code.