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First solution in Clear category for Multicolored Lamp by vlad.bezden
"""
Multicolored Lamp:
The New Year is coming and you've decided to decorate your home.
But simple lights and Christmas decorations are so boring,
so you have figured that you can use your programing skills
and create something really cool and original.
Your task is to create the class Lamp() and method light()
which will make the lamp glow with one of the four colors in
the sequence - (‘Green’, ‘Red’, ‘Blue’, ‘Yellow’).
When the light() method is used for the first time,
the color should be 'Green', the second time - 'Red' and so on.
If the current color is 'Yellow', the next color should be 'Green' and so on.
In this mission you can use the State design pattern.
It's highly useful in the situations where object should change
its behaviour depending on the internal state.
Input: A few strings indicating the number of times the lamp is being turned on.
Output: The color of the lamp.
Precondition: 4 colors: Green, Red, Blue, Yellow.
"""
from itertools import cycle
COLORS = ["Green", "Red", "Blue", "Yellow"]
class Lamp:
def __init__(self):
self.lights = cycle(COLORS)
def light(self) -> str:
return next(self.lights)
if __name__ == "__main__":
lamp_1 = Lamp()
lamp_2 = Lamp()
lamp_1.light() # Green
lamp_1.light() # Red
lamp_2.light() # Green
assert lamp_1.light() == "Blue"
assert lamp_1.light() == "Yellow"
assert lamp_1.light() == "Green"
assert lamp_2.light() == "Red"
assert lamp_2.light() == "Blue"
print("DONE!")
April 6, 2019
