[Distutils] Dependency extensions

Tres Seaver tseaver at palladion.com
Wed Oct 17 12:44:23 CEST 2007

Hash: SHA1

Matt Good wrote:
> On Oct 11, 2007, at 2:20 PM, Tres Seaver wrote:
>> authors have overspecified dependencies in their requirements for a
>> given distribution, mostly because they don't want to have to support
>> their package configurations they don't test.  I'm fine with that line
>> of thought, as long as I have a way to reuse their packaged stuff in
>> combination with mine, where I *do* test with a different version than
>> they do
> Just because you tested your app against "bar" 1.4 and "baz" 1.3
> doesn't mean that every feature of "bar" will work with "baz" 1.3.
> Another app could break because it uses a feature of "bar" that
> doesn't work with that version of "baz" and the authors of one of
> those packages will get the bug report about it instead of you.  If
> you're willing to help with the testing the author might be willing
> to relax the requirements, but trying to override another package's
> requirements is likely to lead to problems.

I agree that this might be problematic in a setup where different
applications share the 'site-packages' directory.  Conflicts of this
sort drove the development of "virtual_python" / "virtualenv" setups,
which make it trivial to isolate separate applications' package sets.

- --
Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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