Add more accessible version information

[stuartarchibald]

As title.

Opened this largely for feedback on the subject! Motivation is that a simple "check if Numba version is high enough to support some feature or other" involves doing something like:

from numba import __version__
assert tuple(int(x) for x in __version__.split('.')[:2]) >= (0, 51)

The currently present numba.__version__ gives something like:

In [1]: import numba                                                                                                            

In [2]: numba.__version__                                                                                                       
Out[2]: '0.52.0dev0+1.g115af3162'

this PR adds version_info which gives this:

In [3]: numba.version_info                                                                                                      
Out[3]: version_info(major=0, minor=52, patch=None, short=(0, 52), full=(0, 52, None), string='0.52.0dev0+1.g115af3162', tuple=('0', '52', '0dev0+1', 'g115af3162'), git_revision='g115af3162')

which makes it much easier to e.g. assert that Numba >= 0.51, e.g.

In [4]: assert numba.version_info.short > (0, 51) 

[esc]

Thanks for patching this up! I tried it and I see:

In [3]: numba.__version__
Out[3]: '0.52.0dev0+1.g115af3162b'

In [4]: numba.version_info
Out[4]: version_info(major=0, minor=52, patch=None, short=(0, 52), full=(0, 52, None), string='0.52.0dev0+1.g115af3162b', tuple=('0', '52', '0dev0+1', 'g115af3162b'), git_revision='g115af3162b')

Though I am asking myself, if patch should be None?

[stuartarchibald]

Though I am asking myself, if patch should be None?

I'm wasn't sure so put in None, the patch isn't linear increment/semver like unless its on a tag, open to suggestions.

[esc]

I think if patch is not None on a tag, this should be fine.

[stuartarchibald]

I think if patch is not None on a tag, this should be fine.

Just tried it:

$ git tag -a 0.123.4 -m "version 0.123.4"
$ git lg|head -1
* 115af3162 - (HEAD -> wip/version_info, tag: 0.123.4, upstream/pr/6086, origin/wip/version_info) Add more accessible version information (2020-08-06 10:29:45 +0100) <Stuart Archibald>
$ python -c "import numba; print(numba.version_info)"
version_info(major=0, minor=123, patch=4, short=(0, 123), full=(0, 123, 4), string='0.123.4', tuple=('0', '123', '4'), git_revision=None)

[esc]

@stuartarchibald that will suffice for me!

[esc]

LGTM