How to designate unreachable python code -


What is the python way of specifying an unchangeable code in Python: 

  gender = readFromDB (...) # 'M' or 'F' if gender == 'm': greeting = 'mister' alif gender == 'f': greeting = 'ms' else: # what should this line say ? Increase ValueArror ('illegal gender% r'% gender)  

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