parenting bug maya 2018

[jhultgre]

pm.parent doesn't seem to work correctly if passed a list and some of the items in the list are already children of the new parent.

It looks like its casting the list of nodes to a string.

This snippet works in maya 2016 but not in maya 2018

import pymel.core as pm

cubes = []
for x in range(10):
    cubes.append(pm.polyCube()[0])

group = pm.group(empty=True)

pm.parent(cubes[:4], group)
pm.parent(cubes, group)

maya 2018 stack trace

# Error: Maya Attribute does not exist (or is not unique):: u"[nt.Transform(u'pCube1'), nt.Transform(u'pCube2'), nt.Transform(u'pCube3'), nt.Transform(u'pCube4'), nt.Transform(u'pCube5'), nt.Transform(u'pCube6'), nt.Transform(u'pCube7'), nt.Transform(u'pCube8'), nt.Transform(u'pCube9'), nt.Transform(u'pCube10')]"
# Traceback (most recent call last):
#   File "<maya console>", line 10, in <module>
#   File "C:\Program Files\Autodesk\Maya2018\Python\lib\site-packages\pymel\core\general.py", line 1391, in parent
#     return [PyNode(x) for x in children]
#   File "C:\Program Files\Autodesk\Maya2018\Python\lib\site-packages\pymel\core\general.py", line 2282, in __new__
#     raise _objectError(name)
# MayaAttributeError: Maya Attribute does not exist (or is not unique):: u"[nt.Transform(u'pCube1'), nt.Transform(u'pCube2'), nt.Transform(u'pCube3'), nt.Transform(u'pCube4'), nt.Transform(u'pCube5'), nt.Transform(u'pCube6'), nt.Transform(u'pCube7'), nt.Transform(u'pCube8'), nt.Transform(u'pCube9'), nt.Transform(u'pCube10')]" # 

[pmolodo]

Fixed in: https://github.com/LumaPictures/pymel/commit/8a9a43647d96bd2aea25f32bf485441694c4a884

Thanks for submitting!