HarkonenBade

pins! {
    PA2 => {
        AF1: TxPin<USART1>,
        AF1: TxPin<USART2>,
    },
    PA3 => {
        AF1: RxPin<USART1>,
        AF1: RxPin<USART2>,
    },
    PA5 => {AF0: SckPin<SPI1>},

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<GPIO_Pin PortName="PB" Name="PB9">
        <SpecificParameter Name="GPIO_Pin">
            <PossibleValue>GPIO_PIN_9</PossibleValue>
        </SpecificParameter>
        <PinSignal Name="CAN_TX">
            <SpecificParameter Name="GPIO_AF">
                <PossibleValue>GPIO_AF4_CAN</PossibleValue>
            </SpecificParameter>
        </PinSignal>
        <PinSignal Name="EVENTOUT">

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class Foo:
    @classmethod
    def my_list(cls):
        if hasattr(cls, 'mylist'):
            return cls.mylist
        cls.mylist = []
        return cls.mylist
  
class Bar(Foo):
    pass

HarkonenBade

def enum_step(seq, start=0, step=1):
    """
    Like the builtin enumerate(seq), but with adjustable stepping.  Useful for backwards enumeration:
    for idx,x in enum_step(reversed(seq), len(seq)-1, -1):
        ...
    """
    for i, x in enumerate(seq):
        yield (start + (i*step), x)