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A comment on Show HN: Poetry – Python dependency management and packaging made easy. Parent comment

Re:Show HN: Poetry – Python dependency management and packag... by detaro on Wednesday March 21, 2018 @11:51AM (#16639170)
Your example of the "better" dependency resolutions seems to violate one of the constraints pipenv sees. Does pipenv somehow assume a rule that isn't there or what's going on in that example?
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Re:Show HN: Poetry – Python dependency management and packag... by sdispater on Wednesday March 21, 2018 @12:06PM (#16639360)
Pipenv sees the wrong constraint. It just aggregates the constraint for pbr that it sees.

In details:

oslo.utils==1.4.0 requires:

- pbr (>= 0.6, != 0.7, < 1.0) - oslo.i18n (>= 1.3)

So, poetry will take the latest version of oslo.i18n which requires:

- pbr (!= 2.1, >= 2.0)

Poetry will detect the conflict and backtrack oslo.i18n to version 2.1.0 which requires:

- pbr (>= 0.11, < 2.0)

This is compatible with the requirements of oslo.utils and pbr==0.11.1 will be installed

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