copySkinWeights erred on repeated usage of "influenceAssociation" in Python...BUG?

[mcw0]

cmds.copySkinWeights(ss=skin1, ds=skin2, mirrorMode="YZ", surfaceAssociation="closestPoint", influenceAssociation="oneToOne", influenceAssociation="closestJoint", normalize=True)

# Error: keyword argument repeated: influenceAssociation
# # File "<maya console>", line 5
# # SyntaxError: keyword argument repeated: influenceAssociation

PS. Maya2023.3

[FirespriteNate · Accepted solution]

That's not a bug, Python syntax doesn't allow the repeated use of a function argument.

Several MEL commands allow you to specify multiple "items" into the same flag/arg, for example on a curve you can specify multiple points:

curve -degree 1 -point 0 0 0 -point 1 0 0;

but this is completely invalid in Python, so they got around it by compiling multiple entries into a single tuple value:

cmds.curve(degree=1, point=((0,0,0),(1,0,0)))

I've never used the copySkinWeights command, but I assume the same logic is present, so you would just need to do something like:

cmds.copySkinWeights(ss=skin1, ds=skin2, mirrorMode="YZ", surfaceAssociation="closestPoint", influenceAssociation=("oneToOne", "closestJoint"), normalize=True)

[mcw0]

Thank you!