--description--

Just after the terms list, create a for loop and use the .items() method to iterate over the keys and values stored in the coefficients attribute. Use n and coefficient as the loop variables.

Inside the loop, create an if statement that checks if the coefficient at the current iteration has a falsy value and skip the iteration in that case. This is because you don't want to represent coefficients with the value of zero.

--hints--

You should create a for loop that iterates over coefficients.items().

({ test: () => assert(runPython(`_Node(_code).find_class("Equation").find_function("__str__").find_for_loops()[0].find_for_iter().is_equivalent("self.coefficients.items()")`)) })

Your for loop should use n and coefficient to iterate over coefficients.items().

({ test: () => assert(runPython(`_Node(_code).find_class("Equation").find_function("__str__").find_for_loops()[0].find_for_vars().is_equivalent("n, coefficient")`)) })

You should create an if statement to check if coefficient has a falsy value inside your for loop.

({ test: () => assert(runPython(`
if_cond = _Node(_code).find_class("Equation").find_function("__str__").find_for_loops()[0].find_ifs()[0].find_conditions()[0]
conditions = ["not coefficient", "coefficient == 0", "0 == coefficient"]
any(if_cond.is_equivalent(condition) for condition in conditions)
`)) })

You should use the continue keyword inside your new if statement.

({ test: () => assert(runPython(`
_Node(_code).find_class("Equation").find_function("__str__").find_for_loops()[0].find_ifs()[0].find_bodies()[0].has_stmt("continue")
`)) })

Your for loop should be placed just after the declaration of terms.

({ test: () => assert(runPython(`
loop = str(_Node(_code).find_class("Equation").find_function("__str__").find_for_loops()[0])
_Node(_code).find_class("Equation").find_function("__str__").is_ordered("terms = []", loop, "equation_string = ' '.join(terms)", "return equation_string")
`)) })

--seed--

--seed-contents--

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:
            raise ValueError("Highest degree coefficient must be different from zero")
        self.coefficients = {(len(args) - n - 1): arg for n, arg in enumerate(args)}

    def __init_subclass__(cls):
        if not hasattr(cls, "degree"):
            raise AttributeError(
                f"Cannot create '{cls.__name__}' class: missing required attribute 'degree'"
            )
--fcc-editable-region--
    def __str__(self):
        terms = []
        
--fcc-editable-region--
        equation_string = ' '.join(terms)
        return equation_string        
    
    @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)

Step 20

--description--

--hints--

--seed--

--seed-contents--