Как заставить метод класса начинать счёт элементов списка не с 0, а с 1?

CHANNELS = ["BBC", "Discovery", "TV1000"]

class TvController:
    def __init__(self, *channels):
        self.channels = channels
        self._current_channel = 0
    
    def turn_channel(self, first_channel):
        self._current_channel = first_channel
        return self.channels[self._current_channel]

class TvController:
    def __init__(self, channels):
        self.channels = channels
        self.current_channel_number = 1
 
    def turn_channel(self, channel_number):
        self.current_channel_number = channel_number
 
    def get_channel_name(self):
        return self.channels[self.current_channel_number - 1]
 
 
CHANNELS = ["BBC", "Discovery", "TV1000"]
 
tc = TvController(CHANNELS)
print(tc.get_channel_name())
tc.turn_channel(3)
print(tc.get_channel_name())

from functools import singledispatchmethod
 
class AzhOldSkulySvelo(list):
    @singledispatchmethod
    def __getitem__(self, key: int):
        return list.__getitem__(self, key - 1)
        
    @__getitem__.register
    def _(self, key: slice):
        return list.__getitem__(self, slice(key.start is not None and key.start - 1 or None, key.stop is not None and key.stop - 1 or None, key.step))
        
CHANNELS = AzhOldSkulySvelo(("BBC", "Discovery", "TV1000"))
assert CHANNELS[1] == "BBC"
assert CHANNELS[1::3] == ["BBC"]