Learn Interfaces by Building an Equation Solver - Step 17

Python
1

Tell us what’s happening:

I’ve created the correct output but is there a way to only use a dictionary comprehension to recreate this

Your code so far

from abc import ABC, abstractmethod

class Equation(ABC):
    degree: int
    
    def __init__(self, *args):
        if (self.degree + 1) != len(args):
            raise TypeError(
                f"'Equation' object takes {self.degree + 1} positional arguments but {len(args)} were given"
            )
        if any(not isinstance(arg, (int, float)) for arg in args):
            raise TypeError("Coefficients must be of type 'int' or 'float'")
        if args[0] == 0:

# User Editable Region

            raise ValueError("Highest degree coefficient must be different from zero")
        self.coefficients = dict(sorted({num:arg for num,arg in enumerate(reversed(args))}.items(),reverse = True))


# User Editable Region

    def __init_subclass__(cls):
        if not hasattr(cls, "degree"):
            raise AttributeError(
                f"Cannot create '{cls.__name__}' class: missing required attribute 'degree'"
            )
    
    @abstractmethod
    def solve(self):
        pass
        
    @abstractmethod
    def analyze(self):
        pass
        
class LinearEquation(Equation):
    degree = 1
    
    def solve(self):
        pass
    
    def analyze(self):
        pass

    
lin_eq = LinearEquation(2, 3)
print(lin_eq.coefficients)

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Challenge Information:

Learn Interfaces by Building an Equation Solver - Step 17

2

I solved it. You reverse, enumerate, then sort and reverse it again

2 Likes
3

It is great that you solved the challenge, but instead of posting your full working solution, it is best to stay focused on answering the original poster’s question(s) and help guide them with hints and suggestions to solve their own issues with the challenge.

We are trying to cut back on the number of spoiler solutions found on the forum and instead focus on helping other campers with their questions and definitely not posting full working solutions.

4

my fault. I’ll keep that in mind for next time