A setter : method « Class « Python Tutorial

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Python Tutorial » Class » method 
11. 4. 7. A setter
class HideX(object):
    def __init__(self, x):
        self.x = x

    def get_x(self):
        return ~self.__x

    def set_x(self, x):
        assert isinstance(x, int)'"x" must be an integer!'
        self.__x = ~x

    x = property(get_x, set_x)

inst = HideX(20)
print inst.x
inst.x = 30
print inst.x
11. 4. method
11. 4. 1. Methods in class
11. 4. 2. Intermediate Customization
11. 4. 3. Any Number of Items Iterator
11. 4. 4. __str__, __add__, __mul__,__nonzero__,__norm_cval,__cmp__
11. 4. 5. Wrapping Standard Types
11. 4. 6. The property() built-in function can take up to four arguments.
11. 4. 7. A setter
11. 4. 8. stick in a documentation string for your attribute
11. 4. 9. Here is our modified class inspired by the recipe:
11. 4. 10. Class Time with accessor methods.
11. 4. 11. Methods calling
11. 4. 12. Add method to a class from outside
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