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Implementation of the PEP 564: Add time.time_ns() #75965

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vstinner opened this issue Oct 13, 2017 · 4 comments
Closed

Implementation of the PEP 564: Add time.time_ns() #75965

vstinner opened this issue Oct 13, 2017 · 4 comments
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3.7 (EOL) end of life stdlib Python modules in the Lib dir type-feature A feature request or enhancement

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@vstinner
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BPO 31784
Nosy @vstinner
PRs
  • bpo-31784: Implement PEP 564: add time.time_ns() #3989
  • bpo-31784: Use time.time_ns() in uuid.uuid1() #11189
  • [WIP] bpo-36205: incorrect time.process_time when built on macOS < 10.12 #12287
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    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 2017-11-02.15:13:05.426>
created_at = <Date 2017-10-13.21:34:15.734>
labels = ['3.7', 'type-feature', 'library']
title = 'Implementation of the PEP 564: Add time.time_ns()'
updated_at = <Date 2019-03-12.09:39:13.861>
user = 'https://github.com/vstinner'

    bugs.python.org fields:

    activity = <Date 2019-03-12.09:39:13.861>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2017-11-02.15:13:05.426>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2017-10-13.21:34:15.734>
creator = 'vstinner'
dependencies = []
files = []
hgrepos = []
issue_num = 31784
keywords = ['patch']
message_count = 4.0
messages = ['304365', '304475', '305426', '332045']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = ['3989', '11189', '12287']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue31784'
versions = ['Python 3.7']
    @vstinner
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    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

    @vstinner vstinner added 3.7 (EOL) end of life stdlib Python modules in the Lib dir type-feature A feature request or enhancement labels Oct 13, 2017
    @vstinner vstinner changed the title Add time.time_ns(): get time with nanosecond resolution Implementation of the PEP 564: Add time.time_ns() Oct 16, 2017
    @vstinner
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    For the full rationale, see my thread on python-ideas: (...)

    I just created the PEP-564: "Add new time functions with nanosecond resolution".

    @vstinner
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    vstinner commented Nov 2, 2017

    New changeset c29b585 by Victor Stinner in branch 'master':
    bpo-31784: Implement PEP-564: add time.time_ns() (bpo-3989)
    c29b585

    @vstinner vstinner closed this as completed Nov 2, 2017
    @vstinner
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    New changeset 62a68b7 by Victor Stinner in branch 'master':
    bpo-31784: Use time.time_ns() in uuid.uuid1() (GH-11189)
    62a68b7

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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