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Python中C++类特性的实现原理
<span style="font-size:18px;">#python类的特性</span>
<span style="font-size:18px;">#而且python还可以实现函数的重载,通过不同的参数来做不同的内部实现</span>
<span style="font-size:18px;">#def overload(*args):</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>def overload1():</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>print("No args")</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>def overload2(x):</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>print("one args")</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>def overload3(x,y):</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>print("two args")</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>if len(args) == 0:</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>overload1()</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>elif len(args) == 1:</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>overload2(*args)</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>else len(args) == 2:</span>
<span style="font-size:18px;">#<span style="white-space:pre"> </span>overload3(*args)</span>
<span style="font-size:18px;"> class Point: x = 100 y = 200 def __init__(self, *args): try: self.x = args[0] self.y = args[1] except ValueError, e: print(e.message) except IndexError, e: print(e.message) def trace(self): print 'x=%d y=%d' % (self.x, self.y) def overload(self): print('Point overload') def baseMethod(self): print('base method!!!!!!') <strong><span style="color:#ff0000;"> #接口预留,本处没有实现doVirtual,经由子类来实现 def delegate(self): self.doVirtual()</span></strong> class Point3D(Point): z = 0 def __init__(self, *args): try: Point.__init__(self, *args) self.z = args[2] except IndexError, e: print e.message <strong><span style="color:#ff0000;"> #函数重写override def trace(self): Point.trace(self) print 'z=%d' % self.z</span></strong> <span style="color:#ff0000;"><strong> #函数遮挡 def overload(self, x): print('Point3D visible')</strong></span> class PointProvider(Point): def __init__(self, *argc): Point.__init__(self, *argc) def doVirtual(self): print 'Implements doVirtual!' if __name__ == '__main__': p1 = Point(10,20) p1.k=100 #变相的给增加了成员 pk = 'p1.k=%d' % (p1.k) print(pk) p1.trace() p2 = Point(1,1) p2.overload() #compiler error!!! #print(p2.k) p = Point3D(1,2,3) p.trace() #看不见基类的overload了,必须要传入一个参数 p.overload(100) p2.baseMethod() pp = PointProvider(10,20) pp.delegate()</span>
所以综上所示:
python可以实现类的继承、重载、重写(多态)、函数覆盖(隐藏基类函数)
Python中C++类特性的实现原理
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