arrayPack_numbers

gruntfutuk

Jul 5th, 2018

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''' array packing exercise
write a function that receives a list of positive integers, each less than 256,
packs those numbers into one large number that is returned such that each number
takes up one byte position starting from least significant byte for first list
element, through to most significant byte for last list element
'''
def arrayPacking(arr):
return sum([num << (index * 8) for index, num in enumerate(arr)])
''' test data:
list of tuples each contain list of integers and expected answer '''
tests = [([24, 85, 0], 21784),
([235, 129, 57], 3768811),
([1, 2, 3], 197121),
([56, 13, 111], 7277880)
]
for test_list, answer in tests:
result = arrayPacking(test_list)
try:
assert result == answer
except AssertionError:
print(f'** ERROR ** Expected {answer} for {test_list}, got {result} ')
else:
print(f'{test_list} gives {result}')

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