How to get and change the RadioButton's display texts

["chao yeaj" <yeajchao@xxxxxxxxx>]

Hello ,all
     You know,the radio button has its display text,
     i think there is a label widget

     i want to chang the text of the radio button
     but i do not know how to do that
     i need your help
Any comments  would be much appreciated,and thanks in advance
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