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how to call back a method in python3?

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  how to call back  a method in python3? "水静流深" <1248283536@qq.com> - 2014-08-04 09:56 +0800
    Re: how to call back  a method in python3? Marko Rauhamaa <marko@pacujo.net> - 2014-08-04 08:47 +0300
      Re: how to call back  a method in python3? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-08-04 18:18 +1200

#75657 — how to call back a method in python3?

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I want to call back a function which is the method of a class .

    def callback(self.do,x):
        return(self.do(x))

That is what i want to write,when i input 
     
    def callback(self.do,x):

error message:


      File "<stdin>", line 1
        def callback(self.do,x):
                     ^
    SyntaxError: invalid syntax


`do` is a method in my class ,how to write the code?‍

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#75662

"水静流深" <1248283536@qq.com>:

> I want to call back a function which is the method of a class .
>
>     def callback(self.do,x):
>         return(self.do(x))
>
> That is what i want to write,when i input 
>      
>     def callback(self.do,x):
>
> error message:

Do this:

    class MyClass:
        def my_method(self):
            def callback(x):
                return self.do(x)
            return callback

        def do(self, x):
            print("done: {}".format(x))

then call:

    m = MyClass()
    callback = m.my_method()
    callback(7)


Marko

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#75663

Marko Rauhamaa wrote:
> Do this:
> 
>     class MyClass:
>         def my_method(self):
>             def callback(x):
>                 return self.do(x)
>             return callback
> 
>         def do(self, x):
>             print("done: {}".format(x))

Or more simply:

       def my_method(self):
          return self.do

-- 
Greg

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