我如何在另一个函数中使用一个函数

Question

I am currently playing around with classes and functions since i am not familiar with python and i would like to know how i can get addy(self, addx) to call addx.

class test:

    def __init__(self, x):
        self.x = x

    def addx(self):
        y = self.x + 10
        return y

    def addy(self, addx):
        z = addx() + 10
        return z

one = test(1)
print(one.addy())

line 15, in print(one.addy()) TypeError: addy() missing 1 required positional argument: 'addx' Process finished with exit code 1

Answer 1

You need to call self from within a class method. self.addx()

Also the addx parameter on this line shouldn't be there: def addy(self, addx):

I think this is what you are going for:

class test:
  def __init__(self, x):
    self.x = x

  def addx(self):
    y = self.x + 10
    return y

  def addy(self):
    z = self.addx() + 10
    return z

one = test(1)
print(one.addy())

Answer 2

You've overcomplicated things by wrapping it in a class. Take it out and it'll work (mostly) the way you expect.

def add10(x):
    return x+10

def add20(x):
    return add10(add10(x))

Since you've wrapped it in the class you've complicated the namespace. It's no longer called addx or addy , so using those names throws a NameError . You have to use the qualified name instead.

class FooBar():
    def __init__(self):
        self.x = 10

    def addx(self):
        return self.x + 10  # Note the `self.` before the attribute...

    def addy(self):
        return self.addx() + 10  # ...and also before the method name.

Methods are always passed their owning object as a first argument when called, which is why we've got def addx(self): but then call with self.addx()

Answer 3

If you are attempting to relate addx in the signature of addy to the method addx , you can pass the string name of the method and use getattr :

class Test:
  def __init__(self, x):
    self.x = x
  def addx(self):
    y = self.x + 10
    return y
  def addy(self, func):
    z = getattr(self, func)() + 10
    return z

s = Test(3)
print(s.addy('addx'))