<filename>bioinfo/molecules/sugars.py
class PentoseSugar:
    def __init__(self):
        pass

    def __eq__(self, other):
        return isinstance(self, type(other))

class Ribose(PentoseSugar):
    def __init(self):
        pass

class Deoxyribose(PentoseSugar):
    def __init(self):
        pass

<filename>bioinfo/molecules/sugars.py
class PentoseSugar:
    def __init__(self):
        pass

    def __eq__(self, other):
        return isinstance(self, type(other))

class Ribose(PentoseSugar):
    def __init(self):
        pass

class Deoxyribose(PentoseSugar):
    def __init(self):
        pass
