getMeshWithUVsOutRange() @Royn3D

"""

 Quick and dirty script to select the mesh shapes from your current selection that have UV shells that are ON the border.
 or outside (or on) the range given by the parameters in the script.

 Written by Roy Nieterau at Colorbleed Animation Studios (www.colorbleed.nl)
 For our 'never spoke with this guy before' friend @cgbeige (Dave Girard).

 Consider this released under the GNU GENERAL PUBLIC LICENSE, use it whenever you like.

"""
import maya.api.OpenMaya as om2
import maya.cmds as mc


def getMeshWithUVsOutRange(meshShapes, minU=0.0, maxU=1.0, minV=0.0, maxV=1.0):

    # Get a list of all meshes that have UVs out of range
    outsideOfRange = []
    for mesh in meshShapes:
        uvs = om2.MFnMesh(om2.MGlobal.getSelectionListByName(mesh).getDependNode(0)).getUVs()
        if any((u, v) for (u, v) in zip(uvs[0], uvs[1]) if u <= minU or u >= maxU or v <= minV or v >= maxV):
            outsideOfRange.append(mesh)

    return outsideOfRange


if __name__ == "__main__":

    # Get all mesh shapes nodes from the selection (note: gets any in the children hierarchy as well)
    shapes = mc.ls(sl=1, dag=1, leaf=1, shapes=1, long=1)
    meshes = mc.ls(shapes, long=1, type="mesh")

    outsideOfRange = getMeshWithUVsOutRange(meshes)

    # Do something with our filtered result
    if not outsideOfRange:
        print "You're safe. Everything in range!"
    else:
        mc.select(outsideOfRange, r=1)
        print "Darn dude, fix this shit! Check these: {0}".format(outsideOfRange)