python - testing bytes from a serial port -

I am trying to test the data obtained from a serial port and it can not be found correct. I need to check whether the first byte obtained in the packet is 0xBE:

  #ser pyserial serial object data = ser.read (5) print "serial RX:" + binascii .b2a_hex ( Data) if data [0]! = 0xBE: Print "wrong value"   
 always prints:  
  Serial RX: beef000008 wrong value   
 Even if the binary to print ascii shows that the correct value has been received.  
 Where am I actually going wrong in this basic work?  
 Thank you, Robin.   
 From 
 
:  
  changed to version 2.5: when available Returns an example of bytes (Python 2.6 and newer) and otherwise str   
 so I tested:  
  & gt; & Gt; Bytes (0xbe) == 0xbe incorrect   
 But if you convert it to int:  
  & gt; & Gt; Int (bytes (0xbe)) == 0xbe True   
 As it shows, type is included by [PEP-3137]. This is for Python 3, but there is only one surname for  str .  
 So, basically, while treating the output of pyserial as a  str , again python2 codes are done.