use ''.format instead of eval() and use some list comprehension for making list delete some unused variables Cc: Yonghong Zhu <yonghong.zhu@intel.com> Cc: Liming Gao <liming.gao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Jaben Carsey <jaben.carsey@intel.com> Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>