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O'REILLY - "Lightbulb Intro" solution in Uncategorized category for Lightbulb Intro by jsg-inet
from datetime import datetime, timedelta
from typing import List
def sum_light(els: List[datetime]) -> int:
"""
how long the light bulb has been turned on
"""
status=True
period= 0
for instant in range(1, len(els)):
if status:
period += (els[instant] - els[instant-1]).total_seconds()
status = not status
return int(period)
if __name__ == '__main__':
print("Example:")
print(sum_light([
datetime(2015, 1, 12, 10, 0 , 0),
datetime(2015, 1, 12, 10, 10 , 10),
datetime(2015, 1, 12, 11, 0 , 0),
datetime(2015, 1, 12, 11, 10 , 10),
]))
# These "asserts" are used for self-checking and not for an auto-testing
assert sum_light(els=[
datetime(2015, 1, 12, 10, 0 , 0),
datetime(2015, 1, 12, 10, 10 , 10),
]) == 610
assert sum_light([
datetime(2015, 1, 12, 10, 0 , 0),
datetime(2015, 1, 12, 10, 10 , 10),
datetime(2015, 1, 12, 11, 0 , 0),
datetime(2015, 1, 12, 11, 10 , 10),
]) == 1220
assert sum_light([
datetime(2015, 1, 12, 10, 0 , 0),
datetime(2015, 1, 12, 10, 10 , 10),
datetime(2015, 1, 12, 11, 0 , 0),
datetime(2015, 1, 12, 11, 10 , 10),
datetime(2015, 1, 12, 11, 10 , 10),
datetime(2015, 1, 12, 12, 10 , 10),
]) == 4820
assert sum_light([
datetime(2015, 1, 12, 10, 0 , 0),
datetime(2015, 1, 12, 10, 0 , 1),
]) == 1
assert sum_light([
datetime(2015, 1, 12, 10, 0 , 0),
datetime(2015, 1, 12, 10, 0 , 10),
datetime(2015, 1, 12, 11, 0 , 0),
datetime(2015, 1, 13, 11, 0 , 0),
]) == 86410
print("The first mission in series is completed? Click 'Check' to earn cool rewards!")
June 22, 2021
