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三桥墨

#1 Created at ... [Delete] [Delete and Lock User]

parser.StartElementHandler = handler.start_element 这一句里，一个类的函数直接等于（或者赋值）另一个类的函数，这个要怎么理解，原理过程是怎么样的？？

三桥墨

#2 Created at ... [Delete] [Delete and Lock User]

查了些东西觉得是回调函数，但是这个直接用等号的格式或者说语法是怎么一回事呢，有谁懂哇

廖雪峰

#3 Created at ... [Delete] [Delete and Lock User]

回头看 “函数式编程”

为了不泄漏隐私

#4 Created at ... [Delete] [Delete and Lock User]

相当于把右边类的method 传递给左边的。 class ffn(object): def f (self,x,y): return x+y

class f(object): def ff(self,x,y): return x-y pass a=ffn() b=f() print(b.ff(2,1))#输出为1 print(isinstance(b,f))#是f的instance f.ff=a.f print(type(f))#仍旧是class print(f.ff(2, 1)) # 输出为,ff method 已经被替换成了ffn的ff了

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