Python:字符串格式化与枚举？(以pythonic方式生成一个很好的多项式字符串表示)

name = "Alice"
age = 25
print("My name is {} and I am {} years old.".format(name, age))

pi = 3.1415926
print("The value of pi is {:.2f}".format(pi))

name = "Bob"
age = 30
print(f"My name is {name} and I am {age} years old.")

from enum import Enum

class Color(Enum):
    RED = 1
    GREEN = 2
    BLUE = 3

print(Color.RED)

class Polynomial:
    def __init__(self, coefficients):
        self.coefficients = coefficients

    def __str__(self):
        terms = []
        for i, coeff in enumerate(self.coefficients):
            if coeff != 0:
                if i == 0:
                    term = str(coeff)
                elif i == 1:
                    term = f"{'' if coeff == 1 else coeff}x"
                else:
                    term = f"{'' if coeff == 1 else coeff}x^{i}"
                terms.append(term)
        terms.reverse()
        return " + ".join(terms)

p = Polynomial([1, 0, -3, 2])
print(p)