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First - slice & sum solution in Clear category for Even the Last by maxnrg
"""Even the Last
You are given an array of integers.
You should find the sum of the integers with even indexes (0th, 2nd, 4th...).
Then multiply this summed number and the final element of the array together.
Don't forget that the first element has an index of 0.
For an empty array, the result will always be 0 (zero).
Input: A list of integers.
Output: The number as an integer.
Example:
checkio([0, 1, 2, 3, 4, 5]) == 30
checkio([1, 3, 5]) == 30
checkio([6]) == 36
checkio([]) == 0
How it is used: Indexes and slices are important elements of coding. This will come in handy down the road!
Precondition: 0 ≤ len(array) ≤ 20
all(isinstance(x, int) for x in array)
all(-100 < x < 100 for x in array)
"""
def checkio(array):
""" sums even-indexes elements and multiply at the last """
return sum(array[::2]) * array[-1] if array else 0
# These "asserts" using only for self-checking and not necessary for auto-testing
if __name__ == '__main__':
print('Example:')
print(checkio([0, 1, 2, 3, 4, 5]))
assert checkio([0, 1, 2, 3, 4, 5]) == 30, "(0+2+4)*5=30"
assert checkio([1, 3, 5]) == 30, "(1+5)*5=30"
assert checkio([6]) == 36, "(6)*6=36"
assert checkio([]) == 0, "An empty array = 0"
print("Coding complete? Click 'Check' to review your tests and earn cool rewards!")
Dec. 15, 2019
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