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| import math | |
| def stddev(numbers): | |
| n = len(numbers) | |
| mean = sum(numbers) / n | |
| dev = [x - mean for x in numbers] | |
| dev2 = [x * x for x in dev] | |
| return math.sqrt(sum(dev2) / n) |
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| /* ----------------------------------------------------------------------- | |
| 1. Show the cycle for 3. | |
| What is the cycle length? | |
| [Collatz] | |
| (2 pts) | |
| 3, 10, 5, 16, 8, 4, 2, 1 | |
| 8 | |
| */ |
danielrobertson
/ range.py
Last active
August 29, 2015 13:56
My idea of what Python 3's range(begin, end, step) looks like
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| def range(begin, end = None, step = 1): | |
| if step == 0: | |
| raise Exception("Step size cannot be 0") | |
| if end == None: | |
| end, begin = begin, 0 | |
| while (abs(begin + step - end)) <= (abs(begin - end)): | |
| yield begin | |
| begin += step | |
| assert(list(range(10)) == [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]) |
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