--description--

The hasattr built-in function takes an object as its first argument and a string representing an attribute name as its second argument. It returns a boolean indicating if the object has the specified attribute.

Now you are going to use the __init_subclass__ method to check if the child class has the degree attribute at the moment of the instantiation.

Create an if statement to check if cls does not have a degree attribute. If so, raise an AttributeError and use the string f"Cannot create '{cls.__name__}' class: missing required attribute 'degree'" to provide a custom message.

After that, fix the error that has appeared in the terminal by declaring a degree class attribute inside the LinearEquation class. This attribute should represent the degree of the equation, which is the exponent of the highest \( x \) term. Therefore, assign the integer 1 to the degree attribute.

--hints--

You should create an if statement that checks if cls does not have the attribute degree inside the __init_subclass__ method.

({ test: () => assert(runPython(`_Node(_code).find_class("Equation").find_function("__init_subclass__").find_ifs()[0].find_conditions()[0].is_equivalent("not hasattr(cls, 'degree')")`)) })

You should raise an AttributeError using the provided string inside your if statement.

({ test: () => runPython(`
raise_stmt = 'raise AttributeError(f"Cannot create \\'{cls.__name__}\\' class: missing required attribute \\'degree\\'")'
node = _Node(_code).find_class("Equation").find_function("__init_subclass__").find_ifs()[0].find_bodies()[0]
assert node.has_stmt(raise_stmt) 
`) })

--seed--

--seed-contents--

from abc import ABC, abstractmethod


class Equation(ABC):
    degree: int
    
    def __init__(self):
        pass
--fcc-editable-region--
    def __init_subclass__(cls):
        pass

    @abstractmethod
    def solve(self):
        pass
        
    @abstractmethod
    def analyze(self):
        pass


class LinearEquation(Equation):
    
--fcc-editable-region--
    def solve(self):
        pass

    def analyze(self):
        pass


lin_eq = LinearEquation()