The meaning of single underline and double underline in Python class

# "Single underline"   The starting member variable is called a protection variable, meaning that only class objects and subclass objects can access these variables themselves; # "Double underline"   begins with a private member, meaning that only the class object can access it, and even the subclass object cannot access the data. Class pub (object):    var1 =  ' Hello '     _var2 =   ' yes '     __var3 =  ' hah '     def __init__ (self):         self._a = 123         self.__b = 456        self.c = 789     def show_a_var (self):        return  Self._a    def show_b_var (self):         Return self.__b    def show_var2 (self):         return self._var2    def show_var3 (self):         return self.__Var3class foo (Pub):     passprint (PUB.VAR1) sl = pub () print (SL.C) print ( Sl.show_a_var ()) print (Sl.show_b_var ()) print (SL.SHOW_VAR2 ()) print (SL.SHOW_VAR3 ()) Fa = foo () print (fa._ VAR2) print (fa.var1) print (Fa.show_a_var ()) print (FA.SHOW_VAR2 ())

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The meaning of single underline and double underline in Python class