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__call__方法的功能类似于在类中重载 () 运算符。使得类实例对象可以像调用普通函数那样，以“对象名()”的形式使用。 class Test(): def __call__(self,name): print("hello, I am ", name) T = Test() T('Alice') >> hello, I am Alice ...

functools.partial def sum(x,y) : return x+y f = functools.partial( f, y=1 ) f(2) 3 # Works as expected def sum(x,y) : return x+y f = functools.partial( f, x=1 ) f(2) TypeError: sum() got multiple values for argument 'x' 报错原因： Python first