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z_tilt: Improve python3 compatibility 

Sort using comparison on only first item in list to avoid greater/less
than comparison of stepper objects (which causes an error on Python3).

Reported by discourse user salbang.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2023-01-17 18:09:57 -05:00
parent 4671cf2d0e
commit 86acee6e8b
1 changed files with 1 additions and 1 deletions
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klippy/extras/z_tilt.py
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@ -41,7 +41,7 @@ class ZAdjustHelper:
s.set_trapq(None)
# Move each z stepper (sorted from lowest to highest) until they match
positions = [(-a, s) for a, s in zip(adjustments, self.z_steppers)]
positions.sort()
positions.sort(key=(lambda k: k[0]))
first_stepper_offset, first_stepper = positions[0]
z_low = curpos[2] - first_stepper_offset
for i in range(len(positions)-1):