我可以将类方法作为默认参数传递给另一个类方法吗 [英] Can I pass class method as and a default argument to another class method

问题描述

我想将类方法和默认参数传递给另一个类方法，以便可以将该方法作为 @classmethod ：

I want to pass class method as and a default argument to another class method, so that I can reuse the method as a @classmethod:

@classmethod
class foo:
    def func1(self,x):
        do somthing;
    def func2(self, aFunc = self.func1):
        # make some a call to afunc
        afunc(4)

这就是为什么在类 aFunc func2 的原因$ c>默认为 self.func1 ，但我可以从类外部调用此函数，并在输入时将其传递给其他函数。

This is why when the method func2 is called within the class aFunc defaults to self.func1, but I can call this same function from outside of the class and pass it a different function at the input.

我得到：

NameError：名称'self'未定义

NameError: name 'self' is not defined

这是我的设置：

class transmissionLine:  
    def electricalLength(self, l=l0, f=f0, gamma=self.propagationConstant, deg=False):  

但是我希望能够调用具有不同功能的 electricalLength ，例如：

But I want to be able to call electricalLength with a different function for gamma, like:

transmissionLine().electricalLength (l, f, gamma=otherFunc)

推荐答案

默认参数值是在函数定义期间计算的，而不是在函数调用期间计算的。所以不，你不能。但是，您可以执行以下操作：

Default argument values are computed during function definition, not during function call. So no, you can't. You can do the following, however:

def func2(self, aFunc = None):
    if aFunc is None:
        aFunc = self.func1
    ...

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