python - Replacing value in dictionary -

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I'm not sure how to change the value of a dictionary with the second value I b Value should be replaced with the value of a and the value of c should be replaced by the value of the code (which is a is the value of). For d_values ​​for d_keys in : 

  my_dict = {"a": 1, "b": "a", "My_dict.keys ()": if d_values ​​in d_values: My_dict [d_keys] = d_values ​​  
 I need  my_dict  to become  {a: 1, b: 1, c: 1} , but my code gives me  {a: a ....}  with somewhere line   
 
 
 I think you are more confused, depending on your requirement, just what you want  
 > gt; & gt; therefore values Instead of changing, '' one ': 1,' C ': 1,' B ': 1}   
 dict.fromkeys (my_dict, my_dict, same ku Rebuild the entire dictionary with the capital structure, but with the value  my_dict ['a']

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