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2 lines - sum, zip solution in Clear category for Lightbulb Start Watching by CDG.Axel
from datetime import datetime
from typing import List, Optional
def sum_light(els: List[datetime], start_watching: Optional[datetime] = None) -> int:
"""
how long the light bulb has been turned on
"""
sw = start_watching if start_watching else els[0]
return sum((max(b, sw) - max(a, sw)).total_seconds()
for a, b in zip(els[::2], els[1::2]))
s = 0
for a, b in zip(els[::2], els[1::2]):
if a < start_watching: a = start_watching
if b < start_watching: b = start_watching
s += (b - a).total_seconds()
return s
if __name__ == "__main__":
print("Example:")
print(
sum_light(
[
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 0, 10),
],
datetime(2015, 1, 12, 10, 0, 5),
)
)
assert (
sum_light(
els=[
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 0, 10),
],
start_watching=datetime(2015, 1, 12, 10, 0, 5),
)
== 5
)
assert (
sum_light(
[
datetime(2015, 1, 12, 10, 0, 0),
datetime(2015, 1, 12, 10, 0, 10),
],
datetime(2015, 1, 12, 10, 0, 0),
)
== 10
)
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, 0, 0),
)
== 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),
],
datetime(2015, 1, 12, 11, 0, 10),
)
== 600
)
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, 10, 10, 0),
)
== 620
)
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, 11),
datetime(2015, 1, 12, 12, 10, 11),
],
datetime(2015, 1, 12, 12, 10, 11),
)
== 0
)
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, 11),
datetime(2015, 1, 12, 12, 10, 11),
],
datetime(2015, 1, 12, 12, 9, 11),
)
== 60
)
print("The second mission in series is done? Click 'Check' to earn cool rewards!")
Sept. 6, 2021
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