SolverProblemError should provide more information about why a dependency can't be satisfied about poetry HOT 4 CLOSED

Well I just checked and it seems the maintainers of django-imgix have messed up their releases.

If you take a look at https://pypi.org/pypi/django-imgix/json you can see that there are no distributions for release 1.1.0 but the tarball of 1.1.0 is actually under the 1.0.0 release. So the resolver fails because it can't find any distributions for release 1.1.0 since no packages is returned (See https://github.com/sdispater/poetry/blob/master/poetry/repositories/pypi_repository.py#L92).

I could remove this condition but it would lead to the dependency being resolved (even though its dependencies wouldn't be) so I prefer poetry to fail early.

However, I agree that I should add some logging information in the PyPI repository class to ease debugging.

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I appreciate very much that you looked into this problem @sdispater. I'll work around this problem by using a git dependency.

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With the new resolver introduced in 0.10.0 the error message is much more explanatory:

[SolverProblemError]
Because my-package depends on django-imgix (1.1.0) which doesn't match any versions, versio
n solving failed.

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