本文介绍python的property装饰器

property装饰器可以将一个类的方法变为一个类的属性，从而可以直接通过点的方法来改变这个属性的值，不需要调用getter和setter函数，此方法基于object新类

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class signal_generator(object):
    def __init__(self):
      self._center_frequency=None
    @property
    def center_frequency(self):
        return self._center_frequency
    @center_frequency.setter
    def center_frequency(self, value):
        print 'set center_frequency'
        self._center_frequency = value
    @center_frequency.getter
    def center_frequency(self):
        print 'get center_frequency'
        return self._center_frequency
a = signal_generator()
print a.center_frequency
a.center_frequency = 10
a.center_frequency += 10
print a.center_frequency
# >>> set center_frequency
# >>> get center_frequency
# >>> set center_frequency
# >>> get center_frequency
# >>> 20