def _glyph_kerning_attr(glyph, side):
if int(side) == <NUM_LIT:1>:<EOL><INDENT>return "<STR_LIT>"<EOL><DEDENT>else:<EOL><INDENT>return "<STR_LIT>"<EOL><DEDENT>
Return leftKerningGroup or rightKerningGroup depending on the UFO
    group's side (1 or 2).