Convert exported requirements to constraints format #308
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Add a failing test for URL dependencies. Test output below: nox > Command python -m pip install --constraint=.nox/test/tmp/requirements.txt file:///…/url-dependency/dist/url_dependency-0.1.0-py3-none-any.whl failed with exit code 1: DEPRECATION: Constraints are only allowed to take the form of a package name and a version specifier. Other forms were originally permitted as an accident of the implementation, but were undocumented. The new implementation of the resolver no longer supports these forms. A possible replacement is replacing the constraint with a requirement.. You can find discussion regarding this at pypa/pip#8210. ERROR: Links are not allowed as constraints
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This was referenced Mar 15, 2021
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This PR fixes installation errors due to the use of some forms of requirements as constraints that are no longer supported with pip's new dependency resolver:
Constraints are now rewritten in the form
name==version[; markers], and skipped if either name or version are empty.This PR adds a dependency on the packaging library.
Fixes #141