classmethod and staticmethod

classmethod receives the class (alternative constructors); staticmethod receives nothing extra.

Easy

class Resistor:
    def __init__(self, ohms): self.ohms = ohms
    @classmethod
    def from_code(cls, code: str):    # "472" -> 4700
        return cls(int(code[:2]) * 10 ** int(code[2]))
    @staticmethod
    def series(*rs): return sum(rs)

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