Fix special case of get_python_constraint_from_marker() and SingleMarker.only() #307
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This PR fixes the util function
get_python_constraint_from_marker()
by fixingSingleMarker.only()
.Given a marker not containing
python_version
orpython_full_version
(e.g.'sys_platform == "linux"'
), any python version should be allowed. Thus,get_python_constraint_from_marker()
should return"*"
. Analogously,only("python_version")
on aSingleMarker
'sys_platform == "linux"'
should returnAnyMarker()
instead ofEmptyMarker()
because ifpython_version
is not mentioned, any version is fine.If the last point seems counterintuitive, keep in mind that
""
(empty string) does not representEmptyMarker
butAnyMarker
.Rationale: This fix enables further improvements to reduce the number of overrides in poetry's dependency resolution.