LGTM.com - false positive: if/elif/else comparison incorrect (unreachable, always true)

[kratsg]

Description of the false positive

alpha is a variable provided through the function and takes on any value from (-inf,+inf).

• Related PR: diana-hep/pyhf#574 .
• CC: @lukasheinrich @matthewfeickert
• Language: python

https://lgtm.com/projects/g/diana-hep/pyhf/snapshot/4a8bb79dcb5a18156090441c789404248a4872bb/files/src/pyhf/interpolators/code2.py?sort=name&dir=ASC&mode=heatmap#x490ee0f59f7109a3:1

(and related)

https://lgtm.com/projects/g/diana-hep/pyhf/snapshot/4a8bb79dcb5a18156090441c789404248a4872bb/files/src/pyhf/interpolators/code2.py?sort=name&dir=ASC&mode=heatmap#x4162964d9ead9482:1

[matthewfeickert]

If I change it to elif alpha >= -1 then LGTM is satisfied, but the logic is clearly the same as -1 <= alpha <= 1 in our case. So we're confused why LGTM is flagging this.