Batch export UVs for all selected objects.

batchUVSnapshot.py

import maya.cmds as cmds

def batchUVSnapshot(fp, resolution, fileType):
    
    # List all selected items
    items = cmds.ls( selection = True, long = True )

    for item in items:
        cmds.select( item, replace = True)
        
        # Items will be unicod strings, and we're only interested
        # in the part after the last "|" seperator.
        itemName = str(item.split('|')[-1])
        
        cmds.uvSnapshot(
            aa = True,
            o = True,
            name = fp + itemName,
            fileFormat = fileType,
            xResolution = resolution[0],
            yResolution = resolution[1]
        )
        
batchUVSnapshot(
    "/home/pawa/Projects/ShootForTheMoon/res/", 
    [512, 512],
    "png"
)