56 lines
1.7 KiB
Python
56 lines
1.7 KiB
Python
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class VoiceCommand:
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def __init__(self, channels):
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self.channels = channels
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self.current = 0
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def first_channel(self):
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self.current = 0
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return self.channels[0]
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def last_channel(self):
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self.current = len(self.channels) - 1
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return self.channels[self.current]
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def turn_channel(self, channel):
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self.current = channel - 1
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return self.current_channel()
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def next_channel(self):
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self.current += 1
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if self.current >= len(self.channels):
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self.current = 0
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return self.current_channel()
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def previous_channel(self):
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self.current -= 1
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if self.current < 0:
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self.current = len(self.channels) - 1
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return self.current_channel()
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def current_channel(self):
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return self.channels[self.current]
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def is_exist(self, channel):
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if isinstance(channel, int):
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return "Yes" if 0 <= channel < len(self.channels) else "No"
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else:
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return "Yes" if channel in self.channels else "No"
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if __name__ == '__main__':
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# These "asserts" using only for self-checking and not necessary for auto-testing
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CHANNELS = ["BBC", "Discovery", "TV1000"]
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controller = VoiceCommand(CHANNELS)
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assert controller.first_channel() == "BBC"
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assert controller.last_channel() == "TV1000"
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assert controller.turn_channel(1) == "BBC"
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assert controller.next_channel() == "Discovery"
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assert controller.previous_channel() == "BBC"
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assert controller.current_channel() == "BBC"
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assert controller.is_exist(4) == "No"
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assert controller.is_exist("TV1000") == "Yes"
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print("Coding complete? Let's try tests!")
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