AM_SG py2.7

#Selection de la 2eme curve de la hierarchie de la currentSelection
import maya.cmds as mc

# Selection + check si crv ou cm
def shape_selection():
    selection = mc.ls(selection=True)
    mc.select(d=True)

    shapeSelection = []

    if mc.nodeType(selection) == 'camera' or mc.nodeType(selection) == 'nurbsCurve' and len(selection) == 1:
        mc.select(selection, replace=True)

    elif mc.nodeType(selection) == 'transform' and len(selection) == 1:
        shapeSelection = mc.listRelatives(selection, shapes=True)

        if mc.nodeType(shapeSelection) == 'camera' or mc.nodeType(shapeSelection) == 'nurbsCurve':
            mc.select(shapeSelection, replace=True)

        else:
            mc.select(d=True)
            mc.error('Select one transform(crv or cm)')

    else:
        mc.select(d=True)
        mc.error('Select one transform(crv or cm)')

# Selection du global
def selection_global():
    shapes = mc.ls(selection = True)
    mc.select(d=True)

    parents = mc.ls(shapes, long=True)[0].split('|')[1:-1]
    crv = mc.listRelatives(parents[1], allDescendents=True, type='nurbsCurve')

    globalCrv = mc.listRelatives(crv[1], parent=True)

    mc.select(globalCrv, replace=True)

shape_selection()
selection_global()