def coloraddress_to_bitcoinaddress(coloraddress):
    if "@" is not coloraddress:
        return coloraddress # already btcaddress
    colorid, btcaddress = coloraddress.split("@")
    return btcaddress
dataset/ETHPy150Open chromaway/ngcccbase/ngcccbase/address.py/coloraddress_to_bitcoinaddress/operator `not in` -> `is not`