如何在同一个类中调用一个类的函数

Question

I am trying to call get_data function of class myclass in the same class but it returns this error.

get_data() missing 1 required positional argument: 'self'

How can i call get_data() function in the class?

class MyClass:
    def get_data(self):
        return(1)
    a = get_data()
ab = MyClass()
print(ab.a)

Answer 1

Make use of class constructor __init__

class MyClass:
    def __init__(self):
        self.a = self.get_data()

    def get_data(self):
        return(1)

ab = MyClass()
print(ab.a)

Also, notice I capitalized the class name to follow python classes naming convention.

Answer 2

You can't do that because you've made the function a bound method that takes the instance as the first argument but you're not passing any currently.

I'm not sure what you're upto but you can refer the get_data method as name a (rather than calling), and call it after instantiating an instance:

In [136]: class myclass: 
     ...:     def get_data(self): 
     ...:         return 1 
     ...:          
     ...:     a = get_data 
     ...:      
     ...: ab = myclass() 
     ...: print(ab.a())                                                                                                                                                                                     
1