Enable Javascript in your browser and then refresh this page, for a much enhanced experience.
As multiline and one-liner - Explained solution in Clear category for Lightbulb Intro by Selindian
from datetime import datetime
from typing import List
def sum_light(els: List[datetime]) -> int:
"""
how long the light bulb has been turned on
"""
result = 0
pairs = zip(els[::2], els[1::2]) # Use zip and slicing to get pairs of els-elements (1,2), (3,4), ...
for on, off in pairs: # Loop over that pairs
result += (off - on).total_seconds() # ... calculate difference in total seconds; add that to reults
return int(result) # return result as integer
# Summarized to one line:
# return int(sum([(off - on).total_seconds() for on, off in zip(els[::2], els[1::2])]))
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!")
Sept. 7, 2022
Comments:
