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dataclass, functools.singledispatchmethod and decorated methods solution in Clear category for Voice TV Control by Phil15
from dataclasses import dataclass, field
from functools import singledispatchmethod, wraps
from typing import List
Channel = str
def _channel(method):
@wraps(method)
def _method(self, *args, **kwargs):
method(self, *args, **kwargs)
return self.channels[self.n % len(self.channels)]
return _method
def _bool2text(method):
@wraps(method) # Necessary to keep annotations for singledispatchmethod.
def _method(self, *args, **kwargs):
return 'Yes' if method(self, *args, **kwargs) else 'No'
return _method
@dataclass
class VoiceCommand:
channels: List[Channel] = field(default_factory=list)
n: int = 0
@_channel
def first_channel(self) -> Channel:
self.n = 0
@_channel
def last_channel(self) -> Channel:
self.n = -1
@_channel
def turn_channel(self, n: int) -> Channel:
self.n = n - 1
@_channel
def next_channel(self) -> Channel:
self.n += 1
@_channel
def previous_channel(self) -> Channel:
self.n -= 1
@_channel
def current_channel(self) -> Channel:
pass
@singledispatchmethod
@_bool2text
def is_exist(self, *args, **kwargs):
return False
@is_exist.register
@_bool2text
def _(self, n: int) -> str:
return 0 <= n - 1 < len(self.channels)
@is_exist.register
@_bool2text
def _(self, channel: Channel) -> str:
return channel in self.channels
April 5, 2020
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