The study notes package python

class Room: 
    DEF the __init __ (Self, name, length, width): 
        Self .__ name = name 
        Self .__ length = length 
        Self .__ width = width 
    DEF get_name (Self): 
        return Self .__ name 
    DEF set_name (Self, newName): 
        IF type (newName) and newName.isdigit iS str () == False: 
            Self .__ name = newName 
        the else: 
            Print ( 'illegal name') 
    DEF Area (Self): 
        return length * Self Self .__ .__ width 

jin = Room ( ' gold boss ', 2,1) 
Print (jin.area ()) 
jin.set_name (' 2 ') 
Print (jin.get_name ()) 

# assumption that private property can be a subclass of the parent class to call it 
class Foo: 
    __key =' 123 '# _Foo__key 

class Son (Foo):
    Print (Foo .__ Key) # _Son__key 


# will use proprietary concept de Scene 
# 1 Hidden attribute from a class do not want external calls 
# 2. I want to protect this property, do not want the property to be changed arbitrarily 
# 3. I want to protect the property, not inherited by subclasses