bit manipulation - what is the correct way to process 4 bits inside an octet in python -

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I am writing an application to parse some network packet in a packet field, the protocol version number is in octet, so 4 high bits are 'major' and less 4 'minor' versions are. Currently I am parsing them in the following way, but I am thinking that there is a superb or more 'python' method of doing this: 

  v = ord (data [17]) = (V & amp;; int ('11110000', 2)) & gt; & Gt; 4 small = V and amp; Int ('00001111', 2)  
  
 
 
 You can type binary written words like this For your example, I want to use Hex  
  v = ord (data [17]) key = (v)  0b1111000  
 
 & Amp; 0xF0) & gt; & Gt; 4 minor = (V and 0x0 F)  
 
 You may also want to use the module to break the packet into its components

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