python中property干什么用的？

property(fget=None, fset=None, fdel=None, doc=None)
Return a property attribute.

fget is a function for getting an attribute value, likewise fset is a function for setting, and fdel a function for del’ing, an attribute. Typical use is to define a managed attribute x:

class C:
def __init__(self):
self._x = None

def getx(self):
return self._x
def setx(self, value):
self._x = value
def delx(self):
del self._x
x = property(getx, setx, delx, "I'm the 'x' property.")

If then c is an instance of C, c.x will invoke the getter, c.x = value will invoke the setter and del c.x the deleter.