[Maya-Python] Library versioning
Marcus Ottosson
Hi guys,
I’m looking for a method of evaluating the version of a Python object and comparing it with another.
The object may have a range of versions, such as “Anything above 1.0, but below 1.3.1” whereas the comparison version is fixed, such as “1.0.3”
The object may look something like this:
class MyObject(object):
requires = "mylibrary>=1.0.0, <1.3"
Whereas a function would compare the requirement with a fixed version, like this:
assert is_compatible(MyObject.requires, (1, 0, 6)) is True
This syntax is from the requirements.txt-style of syntaxes and is the one used with Python libraries in general. I implemented an example of this here:
https://gist.github.com/mottosso/f4cb1c636fae3fc63ab0
Another syntax I’m interested in trying was the Rez syntax, but they seem to fulfil much of the same requirements.
http://nerdvegas.github.io/rez/#versioning
Have anyone had experience with this sort of versioning? How are you dealing with this currently? What issues have you encountered?
Best,
Marcus
Justin Israel
I'm actually getting into this area a bit for some work related to env and package management. But for what you are asking, have you seen the StrictVersion and LooseVersion classes available in distutils?
http://epydoc.sourceforge.net/stdlib/distutils.version.Version-class.html
You can instantiate those with your version strings and compare them. I use those in various code that needs to confirm min versions of available libs
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Marcus Ottosson
But for what you are asking, have you seen the StrictVersion and LooseVersion classes available in distutils?
Yeah, but they don’t handle ranges and they’re essentially the equivalent of comparing plain tuples, aside from the alpha/beta extras.
assert (1, 0, 5) > (1, 0, 4)
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Justin Israel
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Chad Dombrova
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Marcus Ottosson
Are you looking for something that handles the parsing of the range format and the operators for you?
Precisely. And it doesn’t have to be in requirements.txt format either, any scheme that handles ranges should work equally fine. I rolled my own here, and that’s fine, but if there is something already out there then I’d like to know and possibly use it instead of an ad-hoc solution. In fact, I'm expecting someone to say something along the lines of "Have a look at distutils.IsCompatible"
In case it helps, the versioning module of Rez will soon become its own independent module that can be installed via pip/pypi.
Yes, that would help. :) The fact that you guys are rolling your own, and that it’s enough of an effort to offer up as an individual package, is to me an indicator that there isn’t anything already out there that does this. Particularly considering that Rez has been around for years and I’m sure you must have been through the same treasure hunt as I am today.
I did try to dig out the versioning mechanism a while back but couldn’t find it. Do you have any pointers as to where I should start looking? Which branch, for instance?
Best,
Marcus
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Marcus Ottosson
Marcus Ottosson
Marcus Ottosson
Until something better comes along, I’ve uploaded a refined version of the example above on GitHub, along with documentation and installation via pip/PyPI, licensed under MIT, available here:
I adapted the documentation to include the same requirements as the Rez example, posted above, so we can compare between them.
Basic usage
$ pip install iscompatible
$ python
>>> from iscompatible import iscompatible
>>> iscompatible("foo>=5", (5, 6, 1))
True
>>> iscompatible("foo>=5.6.1, <5.7", (5, 0, 0))
False
>>> MyPlugin = type("MyPlugin", (), {'version': (5, 6, 1)})
>>> iscompatible("foo==5.6.1", MyPlugin.version)
True
Best,
Marcus