[issue31784] Add time.time_ns(): get time with nanosecond resolution

[STINNER Victor]

New submission from STINNER Victor <victor.stinner at gmail.com>:

time.time() returns time as a float, but the conversion to float lose precision at the nanosecond resolution.

I propose to add a new time.time_ns() function which returns time as an integer number of nanoseconds since epoch. It's similar to the st_mtime_ns field of os.stat_result which extended the old st_mtime field.

For the full rationale, see my thread on python-ideas:
[Python-ideas] Add time.time_ns(): system clock with nanosecond resolution
https://mail.python.org/pipermail/python-ideas/2017-October/047318.html

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components: Library (Lib)
messages: 304365
nosy: haypo
priority: normal
severity: normal
status: open
title: Add time.time_ns(): get time with nanosecond resolution
type: enhancement
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31784>
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