That's what "calendar based versioning" means. It refers to the year of release. See https://calver.org

On July 22, 2018 11:07:58 PM UTC, Bill Deegan <bill@baddogconsulting.com> wrote:

I noticed the version number jumped from 10.0.1 -> 18.0

Is there a reason for such?

Change in version numbering policy which I missed reading?

On Sun, Jul 22, 2018 at 4:07 AM, Paul Moore <p.f.moore@gmail.com> wrote:

Yay! Congratulations on the release, and thanks for all the work you
put into it.

Paul

On 22 July 2018 at 11:51, Pradyun Gedam <pradyunsg@gmail.com> wrote:
> On behalf of the PyPA, I am pleased to announce that pip 18.0 has just
> been released.
>
> To install pip 18.0, you can run
>
>     python -m pip install --upgrade pip
>
> or use get-pip as described in https://pip.pypa.io/en/latest/installing.
> Note that if you are using a version of pip supplied by your
> distribution vendor, vendor-supplied upgrades will be available in due
> course (or you can use pip 18 in a virtual environment).
>
> This is the first pip release since adopting 3 month release cadence and
> a Calendar based versioning scheme (also known as CalVer). In simpler
> words, there will be a new pip release every 3 months unless there are
> no changes since the previous release. More details such as release
> months can be found in pip's development documentation.
>
> The highlights of this release are:
>
> - Python 3.3 is no longer supported - if you need pip on Python 3.3,
>   you should stay on pip 10, which is the last version to support Python
>   3.3.
> - Complete PEP 518 support - includes support for installation of build
>   dependencies from source and Unicode support on Python 2 and Windows
> - New --prefer-binary flag, to prefer older wheels over newer sdists
> - Many bug fixes and minor improvements
>
> Thanks to everyone who put so much effort into the new release. Many of
> the contributions came from community members, whether in the form of
> code, participation in design discussions and/or bug reports. The pip
> development team is extremely grateful to everyone in the community for
> their contributions.
>
> Thanks,
> Pradyun
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